jdk/src/bsd/doc/man/java.1
author pgovereau
Mon, 13 Oct 2014 11:21:51 -0400
changeset 27120 8ed4ea81b048
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child 31876 91b22707521a
permissions -rw-r--r--
8058243: Reduce size of bytecode for large switch statements Reviewed-by: jjg, vromero
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'\" t
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.\"  Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved.
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.\"
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.\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.\"
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.\" This code is free software; you can redistribute it and/or modify it
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.\" under the terms of the GNU General Public License version 2 only, as
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.\" published by the Free Software Foundation.
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.\"
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.\" This code is distributed in the hope that it will be useful, but WITHOUT
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.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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.\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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.\" version 2 for more details (a copy is included in the LICENSE file that
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.\" accompanied this code).
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.\"
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.\" You should have received a copy of the GNU General Public License version
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.\" 2 along with this work; if not, write to the Free Software Foundation,
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.\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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.\"
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.\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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.\" or visit www.oracle.com if you need additional information or have any
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.\" questions.
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.\"
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.\"     Arch: generic
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.\"     Software: JDK 8
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.\"     Date: 21 November 2013
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.\"     SectDesc: Basic Tools
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.\"     Title: java.1
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.\"
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.if n .pl 99999
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.TH java 1 "21 November 2013" "JDK 8" "Basic Tools"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el       .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH NAME    
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java \- Launches a Java application\&.
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.SH SYNOPSIS    
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\fBjava\fR [\fIoptions\fR] \fIclassname\fR [\fIargs\fR]
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.fi     
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.nf     
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\fBjava\fR [\fIoptions\fR] \fB\-jar\fR \fIfilename\fR [\fIargs\fR]
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.fi     
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.sp     
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.TP     
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\fIoptions\fR
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Command-line options separated by spaces\&. See Options\&.
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.TP     
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\fIclassname\fR
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The name of the class to be launched\&.
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.TP     
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\fIfilename\fR
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The name of the Java Archive (JAR) file to be called\&. Used only with the \f3-jar\fR option\&.
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.TP     
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\fIargs\fR
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The arguments passed to the \f3main()\fR method separated by spaces\&.
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.SH DESCRIPTION    
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The \f3java\fR command starts a Java application\&. It does this by starting the Java Runtime Environment (JRE), loading the specified class, and calling that class\&'s \f3main()\fR method\&. The method must be declared \fIpublic\fR and \fIstatic\fR, it must not return any value, and it must accept a \f3String\fR array as a parameter\&. The method declaration has the following form:
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\f3public static void main(String[] args)\fP
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.fi     
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.nf     
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\f3\fP
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.fi     
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.sp     
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The \f3java\fR command can be used to launch a JavaFX application by loading a class that either has a \f3main()\fR method or that extends \f3javafx\&.application\&.Application\fR\&. In the latter case, the launcher constructs an instance of the \f3Application\fR class, calls its \f3init()\fR method, and then calls the \f3start(javafx\&.stage\&.Stage)\fR method\&.
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.PP
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By default, the first argument that is not an option of the \f3java\fR command is the fully qualified name of the class to be called\&. If the \f3-jar\fR option is specified, its argument is the name of the JAR file containing class and resource files for the application\&. The startup class must be indicated by the \f3Main-Class\fR manifest header in its source code\&.
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.PP
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The JRE searches for the startup class (and other classes used by the application) in three sets of locations: the bootstrap class path, the installed extensions, and the user\(cqs class path\&.
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.PP
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Arguments after the class file name or the JAR file name are passed to the \f3main()\fR method\&.
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.SH OPTIONS    
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The \f3java\fR command supports a wide range of options that can be divided into the following categories:
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\(bu
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Standard Options
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\(bu
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Non-Standard Options
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\(bu
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Advanced Runtime Options
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\(bu
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Advanced JIT Compiler Options
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\(bu
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Advanced Serviceability Options
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\(bu
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Advanced Garbage Collection Options
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.PP
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Standard options are guaranteed to be supported by all implementations of the Java Virtual Machine (JVM)\&. They are used for common actions, such as checking the version of the JRE, setting the class path, enabling verbose output, and so on\&.
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.PP
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Non-standard options are general purpose options that are specific to the Java HotSpot Virtual Machine, so they are not guaranteed to be supported by all JVM implementations, and are subject to change\&. These options start with \f3-X\fR\&.
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.PP
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Advanced options are not recommended for casual use\&. These are developer options used for tuning specific areas of the Java HotSpot Virtual Machine operation that often have specific system requirements and may require privileged access to system configuration parameters\&. They are also not guaranteed to be supported by all JVM implementations, and are subject to change\&. Advanced options start with \f3-XX\fR\&.
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.PP
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To keep track of the options that were deprecated or removed in the latest release, there is a section named Deprecated and Removed Options at the end of the document\&.
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.PP
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Boolean options are used to either enable a feature that is disabled by default or disable a feature that is enabled by default\&. Such options do not require a parameter\&. Boolean \f3-XX\fR options are enabled using the plus sign (\f3-XX:+\fR\fIOptionName\fR) and disabled using the minus sign (\f3-XX:-\fR\fIOptionName\fR)\&.
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.PP
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For options that require an argument, the argument may be separated from the option name by a space, a colon (:), or an equal sign (=), or the argument may directly follow the option (the exact syntax differs for each option)\&. If you are expected to specify the size in bytes, you can use no suffix, or use the suffix \f3k\fR or \f3K\fR for kilobytes (KB), \f3m\fR or \f3M\fR for megabytes (MB), \f3g\fR or \f3G\fR for gigabytes (GB)\&. For example, to set the size to 8 GB, you can specify either \f38g\fR, \f38192m\fR, \f38388608k\fR, or \f38589934592\fR as the argument\&. If you are expected to specify the percentage, use a number from 0 to 1 (for example, specify \f30\&.25\fR for 25%)\&.
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.SS STANDARD\ OPTIONS    
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These are the most commonly used options that are supported by all implementations of the JVM\&.
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.TP
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-agentlib:\fIlibname\fR[=\fIoptions\fR]
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.br
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Loads the specified native agent library\&. After the library name, a comma-separated list of options specific to the library can be used\&.
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If the option \f3-agentlib:foo\fR is specified, then the JVM attempts to load the library named \f3libfoo\&.so\fR in the location specified by the \f3LD_LIBRARY_PATH\fR system variable (on OS X this variable is \f3DYLD_LIBRARY_PATH\fR)\&.
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The following example shows how to load the heap profiling tool (HPROF) library and get sample CPU information every 20 ms, with a stack depth of 3:
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\f3\-agentlib:hprof=cpu=samples,interval=20,depth=3\fP
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\f3\fP
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The following example shows how to load the Java Debug Wire Protocol (JDWP) library and listen for the socket connection on port 8000, suspending the JVM before the main class loads:
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\f3\-agentlib:jdwp=transport=dt_socket,server=y,address=8000\fP
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\f3\fP
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.fi     
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For more information about the native agent libraries, refer to the following:
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.RS     
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The \f3java\&.lang\&.instrument\fR package description at http://docs\&.oracle\&.com/javase/8/docs/api/java/lang/instrument/package-summary\&.html
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Agent Command Line Options in the JVM Tools Interface guide at http://docs\&.oracle\&.com/javase/8/docs/platform/jvmti/jvmti\&.html#starting
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.RE     
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-agentpath:\fIpathname\fR[=\fIoptions\fR]
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.br
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Loads the native agent library specified by the absolute path name\&. This option is equivalent to \f3-agentlib\fR but uses the full path and file name of the library\&.
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-client
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.br
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Selects the Java HotSpot Client VM\&. The 64-bit version of the Java SE Development Kit (JDK) currently ignores this option and instead uses the Server JVM\&.
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For default JVM selection, see Server-Class Machine Detection at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/vm/server-class\&.html
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.TP
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-D\fIproperty\fR=\fIvalue\fR
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.br
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Sets a system property value\&. The \fIproperty\fR variable is a string with no spaces that represents the name of the property\&. The \fIvalue\fR variable is a string that represents the value of the property\&. If \fIvalue\fR is a string with spaces, then enclose it in quotation marks (for example \f3-Dfoo="foo bar"\fR)\&.
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.TP
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-d32
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.br
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Runs the application in a 32-bit environment\&. If a 32-bit environment is not installed or is not supported, then an error will be reported\&. By default, the application is run in a 32-bit environment unless a 64-bit system is used\&.
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.TP
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-d64
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.br
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Runs the application in a 64-bit environment\&. If a 64-bit environment is not installed or is not supported, then an error will be reported\&. By default, the application is run in a 32-bit environment unless a 64-bit system is used\&.
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Currently only the Java HotSpot Server VM supports 64-bit operation, and the \f3-server\fR option is implicit with the use of \f3-d64\fR\&. The \f3-client\fR option is ignored with the use of \f3-d64\fR\&. This is subject to change in a future release\&.
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.TP
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.nf
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-disableassertions[:[\fIpackagename\fR]\&.\&.\&.|:\fIclassname\fR], -da[:[\fIpackagename\fR]\&.\&.\&.|:\fIclassname\fR]
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.br
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.fi
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Disables assertions\&. By default, assertions are disabled in all packages and classes\&.
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With no arguments, \f3-disableassertions\fR (\f3-da\fR) disables assertions in all packages and classes\&. With the \fIpackagename\fR argument ending in \f3\&.\&.\&.\fR, the switch disables assertions in the specified package and any subpackages\&. If the argument is simply \f3\&.\&.\&.\fR, then the switch disables assertions in the unnamed package in the current working directory\&. With the \fIclassname\fR argument\f3\fR, the switch disables assertions in the specified class\&.
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The \f3-disableassertions\fR (\f3-da\fR) option applies to all class loaders and to system classes (which do not have a class loader)\&. There is one exception to this rule: if the option is provided with no arguments, then it does not apply to system classes\&. This makes it easy to disable assertions in all classes except for system classes\&. The \f3-disablesystemassertions\fR option enables you to disable assertions in all system classes\&.
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To explicitly enable assertions in specific packages or classes, use the \f3-enableassertions\fR (\f3-ea\fR) option\&. Both options can be used at the same time\&. For example, to run the \f3MyClass\fR application with assertions enabled in package \f3com\&.wombat\&.fruitbat\fR (and any subpackages) but disabled in class \f3com\&.wombat\&.fruitbat\&.Brickbat\fR, use the following command:
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.nf     
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\f3java \-ea:com\&.wombat\&.fruitbat\&.\&.\&. \-da:com\&.wombat\&.fruitbat\&.Brickbat MyClass\fP
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.fi     
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.nf     
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\f3\fP
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.TP
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-disablesystemassertions, -dsa
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.br
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Disables assertions in all system classes\&.
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.TP
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.nf
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-enableassertions[:[\fIpackagename\fR]\&.\&.\&.|:\fIclassname\fR], -ea[:[\fIpackagename\fR]\&.\&.\&.|:\fIclassname\fR]
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.br
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.fi
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Enables assertions\&. By default, assertions are disabled in all packages and classes\&.
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With no arguments, \f3-enableassertions\fR (\f3-ea\fR) enables assertions in all packages and classes\&. With the \fIpackagename\fR argument ending in \f3\&.\&.\&.\fR, the switch enables assertions in the specified package and any subpackages\&. If the argument is simply \f3\&.\&.\&.\fR, then the switch enables assertions in the unnamed package in the current working directory\&. With the \fIclassname\fR argument\f3\fR, the switch enables assertions in the specified class\&.
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The \f3-enableassertions\fR (\f3-ea\fR) option applies to all class loaders and to system classes (which do not have a class loader)\&. There is one exception to this rule: if the option is provided with no arguments, then it does not apply to system classes\&. This makes it easy to enable assertions in all classes except for system classes\&. The \f3-enablesystemassertions\fR option provides a separate switch to enable assertions in all system classes\&.
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To explicitly disable assertions in specific packages or classes, use the \f3-disableassertions\fR (\f3-da\fR) option\&. If a single command contains multiple instances of these switches, then they are processed in order before loading any classes\&. For example, to run the \f3MyClass\fR application with assertions enabled only in package \f3com\&.wombat\&.fruitbat\fR (and any subpackages) but disabled in class \f3com\&.wombat\&.fruitbat\&.Brickbat\fR, use the following command:
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.sp     
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.nf     
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\f3java \-ea:com\&.wombat\&.fruitbat\&.\&.\&. \-da:com\&.wombat\&.fruitbat\&.Brickbat MyClass\fP
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.fi     
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.nf     
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\f3\fP
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.fi     
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.TP
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-enablesystemassertions, -esa
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.br
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Enables assertions in all system classes\&.
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.TP
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-help, -?
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.br
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Displays usage information for the \f3java\fR command without actually running the JVM\&.
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.TP
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-jar \fIfilename\fR
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.br
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Executes a program encapsulated in a JAR file\&. The \fIfilename\fR argument is the name of a JAR file with a manifest that contains a line in the form \f3Main-Class:\fR\fIclassname\fR that defines the class with the \f3public static void main(String[] args)\fR method that serves as your application\&'s starting point\&.
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When you use the \f3-jar\fR option, the specified JAR file is the source of all user classes, and other class path settings are ignored\&.
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For more information about JAR files, see the following resources:
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.RS     
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\(bu
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jar(1)
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\(bu
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The Java Archive (JAR) Files guide at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/jar/index\&.html
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\(bu
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Lesson: Packaging Programs in JAR Files at http://docs\&.oracle\&.com/javase/tutorial/deployment/jar/index\&.html
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.RE     
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.TP
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-javaagent:\fIjarpath\fR[=\fIoptions\fR]
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.br
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Loads the specified Java programming language agent\&. For more information about instrumenting Java applications, see the \f3java\&.lang\&.instrument\fR package description in the Java API documentation at http://docs\&.oracle\&.com/javase/8/docs/api/java/lang/instrument/package-summary\&.html
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.TP
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-jre-restrict-search
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.br
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Includes user-private JREs in the version search\&.
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.TP
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-no-jre-restrict-search
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.br
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Excludes user-private JREs from the version search\&.
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.TP
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-server
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.br
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Selects the Java HotSpot Server VM\&. The 64-bit version of the JDK supports only the Server VM, so in that case the option is implicit\&.
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For default JVM selection, see Server-Class Machine Detection at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/vm/server-class\&.html
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.TP
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-showversion
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.br
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Displays version information and continues execution of the application\&. This option is equivalent to the \f3-version\fR option except that the latter instructs the JVM to exit after displaying version information\&.
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.TP
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-splash:\fIimgname\fR
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.br
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Shows the splash screen with the image specified by \fIimgname\fR\&. For example, to show the \f3splash\&.gif\fR file from the \f3images\fR directory when starting your application, use the following option:
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.sp     
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.nf     
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\f3\-splash:images/splash\&.gif\fP
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.fi     
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.nf     
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\f3\fP
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.fi     
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.sp     
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.TP
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-verbose:class
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.br
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Displays information about each loaded class\&.
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.TP
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-verbose:gc
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.br
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Displays information about each garbage collection (GC) event\&.
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.TP
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-verbose:jni
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.br
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Displays information about the use of native methods and other Java Native Interface (JNI) activity\&.
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.TP
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-version
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.br
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Displays version information and then exits\&. This option is equivalent to the \f3-showversion\fR option except that the latter does not instruct the JVM to exit after displaying version information\&.
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.TP
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-version:\fIrelease\fR
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.br
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Specifies the release version to be used for running the application\&. If the version of the \f3java\fR command called does not meet this specification and an appropriate implementation is found on the system, then the appropriate implementation will be used\&.
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The \fIrelease\fR argument specifies either the exact version string, or a list of version strings and ranges separated by spaces\&. A \fIversion string\fR is the developer designation of the version number in the following form: \f31\&.\fR\fIx\fR\f3\&.0_\fR\fIu\fR (where \fIx\fR is the major version number, and \fIu\fR is the update version number)\&. A \fIversion range\fR is made up of a version string followed by a plus sign (\f3+\fR) to designate this version or later, or a part of a version string followed by an asterisk (\f3*\fR) to designate any version string with a matching prefix\&. Version strings and ranges can be combined using a space for a logical \fIOR\fR combination, or an ampersand (\f3&\fR) for a logical \fIAND\fR combination of two version strings/ranges\&. For example, if running the class or JAR file requires either JRE 6u13 (1\&.6\&.0_13), or any JRE 6 starting from 6u10 (1\&.6\&.0_10), specify the following:
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.sp     
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.nf     
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\f3\-version:"1\&.6\&.0_13 1\&.6* & 1\&.6\&.0_10+"\fP
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.fi     
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.nf     
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\f3\fP
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.fi     
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.sp     
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Quotation marks are necessary only if there are spaces in the \fIrelease\fR parameter\&.
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For JAR files, the preference is to specify version requirements in the JAR file manifest rather than on the command line\&.
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.SS NON-STANDARD\ OPTIONS    
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These options are general purpose options that are specific to the Java HotSpot Virtual Machine\&.
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.TP
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-X
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.br
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Displays help for all available \f3-X\fR options\&.
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.TP
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-Xbatch
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.br
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Disables background compilation\&. By default, the JVM compiles the method as a background task, running the method in interpreter mode until the background compilation is finished\&. The \f3-Xbatch\fR flag disables background compilation so that compilation of all methods proceeds as a foreground task until completed\&.
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This option is equivalent to \f3-XX:-BackgroundCompilation\fR\&.
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.TP
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-Xbootclasspath:\fIpath\fR
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.br
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Specifies a list of directories, JAR files, and ZIP archives separated by colons (:) to search for boot class files\&. These are used in place of the boot class files included in the JDK\&.
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\fI\fRDo not deploy applications that use this option to override a class in \f3rt\&.jar\fR, because this violates the JRE binary code license\&.
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.TP
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-Xbootclasspath/a:\fIpath\fR
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.br
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Specifies a list of directories, JAR files, and ZIP archives separated by colons (:) to append to the end of the default bootstrap class path\&.
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Do not deploy applications that use this option to override a class in \f3rt\&.jar\fR, because this violates the JRE binary code license\&.
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.TP
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-Xbootclasspath/p:\fIpath\fR
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.br
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Specifies a list of directories, JAR files, and ZIP archives separated by colons (:) to prepend to the front of the default bootstrap class path\&.
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Do not deploy applications that use this option to override a class in \f3rt\&.jar\fR, because this violates the JRE binary code license\&.
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.TP
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-Xboundthreads
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.br
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Binds user-level threads to kernel threads\&.
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.TP
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-Xcheck:jni
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.br
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Performs additional checks for Java Native Interface (JNI) functions\&. Specifically, it validates the parameters passed to the JNI function and the runtime environment data before processing the JNI request\&. Any invalid data encountered indicates a problem in the native code, and the JVM will terminate with an irrecoverable error in such cases\&. Expect a performance degradation when this option is used\&.
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.TP
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-Xcomp
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.br
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Disables interpretation of Java code and compile methods on first invocation\&. By default, the JIT compiler performs 10,000 interpreted method invocations to gather information for efficient compilation\&. To increase compilation performance at the expense of efficiency, use the \f3-Xcomp\fR flag to disable interpreted method invocations\&.
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You can also change the number of interpreted method invocations before compilation using the \f3-XX:CompileThreshold\fR option\&.
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.TP
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-Xdebug
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.br
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Does nothing\&. Provided for backward compatibility\&.
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.TP
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-Xdiag
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.br
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Shows additional diagnostic messages\&.
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.TP
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-Xfuture
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.br
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Enables strict class-file format checks that enforce close conformance to the class-file format specification\&. Developers are encouraged to use this flag when developing new code because the stricter checks will become the default in future releases\&.
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.TP
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-Xincgc
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.br
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Enables incremental GC\&.
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.TP
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-Xint
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.br
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Runs the application in interpreted-only mode\&. Compilation to native code is disabled, and all bytecode is executed by the interpreter\&. The performance benefits offered by the just in time (JIT) compiler are not present in this mode\&.
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.TP
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-Xinternalversion
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.br
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   402
Displays more detailed JVM version information than the \f3-version\fR option, and then exits\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   403
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   404
-Xloggc:\fIfilename\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   405
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   406
Sets the file to which verbose GC events information should be redirected for logging\&. The information written to this file is similar to the output of \f3-verbose:gc\fR with the time elapsed since the first GC event preceding each logged event\&. The \f3-Xloggc\fR option overrides \f3-verbose:gc\fR if both are given with the same \f3java\fR command\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   407
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   408
Example:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   409
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   410
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   411
\f3\-Xloggc:garbage\-collection\&.log\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   412
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   413
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   414
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   415
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   416
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   417
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   418
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   419
-Xmaxjitcodesize=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   420
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   421
Specifies the maximum code cache size (in bytes) for JIT-compiled code\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. By default, the value is set to 48 MB:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   422
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   423
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   424
\f3\-Xmaxjitcodesize=48m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   425
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   426
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   427
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   428
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   429
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   430
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   431
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   432
This option is equivalent to \f3-XX:ReservedCodeCacheSize\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   433
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   434
-Xmixed
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   435
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   436
Executes all bytecode by the interpreter except for hot methods, which are compiled to native code\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   437
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   438
-Xmn\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   439
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   440
Sets the initial and maximum size (in bytes) of the heap for the young generation (nursery)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   441
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   442
The young generation region of the heap is used for new objects\&. GC is performed in this region more often than in other regions\&. If the size for the young generation is too small, then a lot of minor garbage collections will be performed\&. If the size is too large, then only full garbage collections will be performed, which can take a long time to complete\&. Oracle recommends that you keep the size for the young generation between a half and a quarter of the overall heap size\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   443
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   444
The following examples show how to set the initial and maximum size of young generation to 256 MB using various units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   445
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   446
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   447
\f3\-Xmn256m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   448
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   449
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   450
\f3\-Xmn262144k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   451
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   452
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   453
\f3\-Xmn268435456\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   454
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   455
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   456
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   457
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   458
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   459
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   460
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   461
Instead of the \f3-Xmn\fR option to set both the initial and maximum size of the heap for the young generation, you can use \f3-XX:NewSize\fR to set the initial size and \f3-XX:MaxNewSize\fR to set the maximum size\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   462
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   463
-Xms\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   464
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   465
Sets the initial size (in bytes) of the heap\&. This value must be a multiple of 1024 and greater than 1 MB\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   466
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   467
The following examples show how to set the size of allocated memory to 6 MB using various units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   468
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   469
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   470
\f3\-Xms6291456\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   471
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   472
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   473
\f3\-Xms6144k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   474
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   475
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   476
\f3\-Xms6m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   477
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   478
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   479
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   480
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   481
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   482
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   483
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   484
If you do not set this option, then the initial size will be set as the sum of the sizes allocated for the old generation and the young generation\&. The initial size of the heap for the young generation can be set using the \f3-Xmn\fR option or the \f3-XX:NewSize\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   485
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   486
-Xmx\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   487
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   488
Specifies the maximum size (in bytes) of the memory allocation pool in bytes\&. This value must be a multiple of 1024 and greater than 2 MB\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. The default value is chosen at runtime based on system configuration\&. For server deployments, \f3-Xms\fR and \f3-Xmx\fR are often set to the same value\&. For more information, see Garbage Collector Ergonomics at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/vm/gc-ergonomics\&.html
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   489
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   490
The following examples show how to set the maximum allowed size of allocated memory to 80 MB using various units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   491
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   492
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   493
\f3\-Xmx83886080\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   494
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   495
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   496
\f3\-Xmx81920k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   497
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   498
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   499
\f3\-Xmx80m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   500
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   501
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   502
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   503
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   504
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   505
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   506
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   507
The \f3-Xmx\fR option is equivalent to \f3-XX:MaxHeapSize\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   508
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   509
-Xnoclassgc
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   510
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   511
Disables garbage collection (GC) of classes\&. This can save some GC time, which shortens interruptions during the application run\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   512
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   513
When you specify \f3-Xnoclassgc\fR at startup, the class objects in the application will be left untouched during GC and will always be considered live\&. This can result in more memory being permanently occupied which, if not used carefully, will throw an out of memory exception\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   514
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   515
-Xprof
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   516
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   517
Profiles the running program and sends profiling data to standard output\&. This option is provided as a utility that is useful in program development and is not intended to be used in production systems\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   518
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   519
-Xrs
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   520
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   521
Reduces the use of operating system signals by the JVM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   522
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   523
Shutdown hooks enable orderly shutdown of a Java application by running user cleanup code (such as closing database connections) at shutdown, even if the JVM terminates abruptly\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   524
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   525
The JVM catches signals to implement shutdown hooks for unexpected termination\&. The JVM uses \f3SIGHUP\fR, \f3SIGINT\fR, and \f3SIGTERM\fR to initiate the running of shutdown hooks\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   526
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   527
The JVM uses a similar mechanism to implement the feature of dumping thread stacks for debugging purposes\&. The JVM uses \f3SIGQUIT\fR to perform thread dumps\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   528
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   529
Applications embedding the JVM frequently need to trap signals such as \f3SIGINT\fR or \f3SIGTERM\fR, which can lead to interference with the JVM signal handlers\&. The \f3-Xrs\fR option is available to address this issue\&. When \f3-Xrs\fR is used, the signal masks for \f3SIGINT\fR, \f3SIGTERM\fR, \f3SIGHUP\fR, and \f3SIGQUIT\fR are not changed by the JVM, and signal handlers for these signals are not installed\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   530
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   531
There are two consequences of specifying \f3-Xrs\fR:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   532
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   533
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   534
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   535
\f3SIGQUIT\fR thread dumps are not available\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   536
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   537
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   538
User code is responsible for causing shutdown hooks to run, for example, by calling \f3System\&.exit()\fR when the JVM is to be terminated\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   539
.RE     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   540
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   541
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   542
-Xshare:\fImode\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   543
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   544
Sets the class data sharing mode\&. Possible \fImode\fR arguments for this option include the following:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   545
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   546
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   547
auto
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   548
Use shared class data if possible\&. This is the default value for Java HotSpot 32-Bit Client VM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   549
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   550
on
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   551
Require the use of class data sharing\&. Print an error message and exit if class data sharing cannot be used\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   552
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   553
off
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   554
Do not use shared class data\&. This is the default value for Java HotSpot 32-Bit Server VM, Java HotSpot 64-Bit Client VM, and Java HotSpot 64-Bit Server VM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   555
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   556
dump
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   557
Manually generate the class data sharing archive\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   558
.RE     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   559
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   560
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   561
-XshowSettings:\fIcategory\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   562
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   563
Shows settings and continues\&. Possible \fIcategory\fR arguments for this option include the following:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   564
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   565
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   566
all
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   567
Shows all categories of settings\&. This is the default value\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   568
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   569
locale
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   570
Shows settings related to locale\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   571
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   572
properties
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   573
Shows settings related to system properties\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   574
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   575
vm
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   576
Shows the settings of the JVM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   577
.RE     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   578
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   579
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   580
-Xss\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   581
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   582
Sets the thread stack size (in bytes)\&. Append the letter \f3k\fR or \f3K\fR to indicate KB, \f3m\fR or \f3M\fR to indicate MB, \f3g\fR or \f3G\fR to indicate GB\&. The default value depends on the platform:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   583
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   584
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   585
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   586
Linux/ARM (32-bit): 320 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   587
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   588
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   589
Linux/i386 (32-bit): 320 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   590
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   591
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   592
Linux/x64 (64-bit): 1024 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   593
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   594
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   595
OS X (64-bit): 1024 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   596
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   597
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   598
Oracle Solaris/i386 (32-bit): 320 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   599
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   600
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   601
Oracle Solaris/x64 (64-bit): 1024 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   602
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   603
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   604
Windows: depends on virtual memory
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   605
.RE
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   606
.RS
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   607
The following examples set the thread stack size to 1024 KB in different units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   608
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   609
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   610
\f3\-Xss1m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   611
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   612
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   613
\f3\-Xss1024k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   614
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   615
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   616
\f3\-Xss1048576\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   617
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   618
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   619
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   620
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   621
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   622
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   623
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   624
This option is equivalent to \f3-XX:ThreadStackSize\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   625
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   626
.RE
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   627
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   628
-Xusealtsigs
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   629
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   630
Use alternative signals instead of \f3SIGUSR1\fR and \f3SIGUSR2\fR for JVM internal signals\&. This option is equivalent to \f3-XX:+UseAltSigs\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   631
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   632
-Xverify:\fImode\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   633
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   634
Sets the mode of the bytecode verifier\&. Bytecode verification helps to troubleshoot some problems, but it also adds overhead to the running application\&. Possible \fImode\fR arguments for this option include the following:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   635
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   636
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   637
none
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   638
Do not verify the bytecode\&. This reduces startup time and also reduces the protection provided by Java\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   639
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   640
remote
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   641
Verify only those classes that are loaded remotely over the network\&. This is the default behavior if you do not specify the \f3-Xverify\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   642
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   643
all
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   644
Verify all classes\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   645
.RE     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   646
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   647
.SS ADVANCED\ RUNTIME\ OPTIONS    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   648
These options control the runtime behavior of the Java HotSpot VM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   649
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   650
-XX:+DisableAttachMechanism
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   651
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   652
Enables the option that disables the mechanism that lets tools attach to the JVM\&. By default, this option is disabled, meaning that the attach mechanism is enabled and you can use tools such as \f3jcmd\fR, \f3jstack\fR, \f3jmap\fR, and \f3jinfo\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   653
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   654
-XX:ErrorFile=\fIfilename\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   655
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   656
Specifies the path and file name to which error data is written when an irrecoverable error occurs\&. By default, this file is created in the current working directory and named \f3hs_err_pid\fR\fIpid\fR\f3\&.log\fR where \fIpid\fR is the identifier of the process that caused the error\&. The following example shows how to set the default log file (note that the identifier of the process is specified as \f3%p\fR):
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   657
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   658
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   659
\f3\-XX:ErrorFile=\&./hs_err_pid%p\&.log\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   660
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   661
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   662
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   663
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   664
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   665
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   666
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   667
The following example shows how to set the error log to \f3/var/log/java/java_error\&.log\fR:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   668
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   669
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   670
\f3\-XX:ErrorFile=/var/log/java/java_error\&.log\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   671
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   672
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   673
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   674
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   675
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   676
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   677
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   678
If the file cannot be created in the specified directory (due to insufficient space, permission problem, or another issue), then the file is created in the temporary directory for the operating system\&. The temporary directory is \f3/tmp\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   679
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   680
-XX:LargePageSizeInBytes=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   681
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   682
Sets the maximum size (in bytes) for large pages used for Java heap\&. The \fIsize\fR argument must be a power of 2 (2, 4, 8, 16, \&.\&.\&.)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. By default, the size is set to 0, meaning that the JVM chooses the size for large pages automatically\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   683
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   684
The following example illustrates how to set the large page size to 4 megabytes (MB):
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   685
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   686
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   687
\f3\-XX:LargePageSizeInBytes=4m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   688
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   689
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   690
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   691
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   692
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   693
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   694
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   695
-XX:MaxDirectMemorySize=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   696
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   697
Sets the maximum total size (in bytes) of the New I/O (the \f3java\&.nio\fR package) direct-buffer allocations\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. By default, the size is set to 0, meaning that the JVM chooses the size for NIO direct-buffer allocations automatically\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   698
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   699
The following examples illustrate how to set the NIO size to 1024 KB in different units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   700
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   701
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   702
\f3\-XX:MaxDirectMemorySize=1m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   703
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   704
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   705
\f3\-XX:MaxDirectMemorySize=1024k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   706
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   707
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   708
\f3\-XX:MaxDirectMemorySize=1048576\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   709
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   710
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   711
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   712
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   713
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   714
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   715
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   716
-XX:NativeMemoryTracking=\fImode\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   717
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   718
Specifies the mode for tracking JVM native memory usage\&. Possible \fImode\fR arguments for this option include the following:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   719
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   720
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   721
off
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   722
Do not track JVM native memory usage\&. This is the default behavior if you do not specify the \f3-XX:NativeMemoryTracking\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   723
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   724
summary
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   725
Only track memory usage by JVM subsystems, such as Java heap, class, code, and thread\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   726
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   727
detail
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   728
In addition to tracking memory usage by JVM subsystems, track memory usage by individual \f3CallSite\fR, individual virtual memory region and its committed regions\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   729
.RE     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   730
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   731
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   732
-XX:OnError=\fIstring\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   733
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   734
Sets a custom command or a series of semicolon-separated commands to run when an irrecoverable error occurs\&. If the string contains spaces, then it must be enclosed in quotation marks\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   735
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   736
\fI\fRThe following example shows how the \f3-XX:OnError\fR option can be used to run the \f3gcore\fR command to create the core image, and the debugger is started to attach to the process in case of an irrecoverable error (the \f3%p\fR designates the current process):
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   737
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   738
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   739
\f3\-XX:OnError="gcore %p;dbx \- %p"\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   740
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   741
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   742
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   743
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   744
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   745
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   746
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   747
-XX:OnOutOfMemoryError=\fIstring\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   748
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   749
Sets a custom command or a series of semicolon-separated commands to run when an \f3OutOfMemoryError\fR exception is first thrown\&. If the string contains spaces, then it must be enclosed in quotation marks\&. For an example of a command string, see the description of the \f3-XX:OnError\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   750
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   751
-XX:+PrintCommandLineFlags
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   752
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   753
Enables printing of ergonomically selected JVM flags that appeared on the command line\&. It can be useful to know the ergonomic values set by the JVM, such as the heap space size and the selected garbage collector\&. By default, this option is disabled and flags are not printed\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   754
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   755
-XX:+PrintNMTStatistics
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   756
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   757
Enables printing of collected native memory tracking data at JVM exit when native memory tracking is enabled (see \f3-XX:NativeMemoryTracking\fR)\&. By default, this option is disabled and native memory tracking data is not printed\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   758
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   759
-XX:+ShowMessageBoxOnError
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   760
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   761
Enables displaying of a dialog box when the JVM experiences an irrecoverable error\&. This prevents the JVM from exiting and keeps the process active so that you can attach a debugger to it to investigate the cause of the error\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   762
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   763
-XX:ThreadStackSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   764
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   765
Sets the thread stack size (in bytes)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. The default value depends on the platform:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   766
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   767
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   768
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   769
Linux/ARM (32-bit): 320 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   770
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   771
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   772
Linux/i386 (32-bit): 320 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   773
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   774
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   775
Linux/x64 (64-bit): 1024 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   776
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   777
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   778
OS X (64-bit): 1024 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   779
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   780
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   781
Oracle Solaris/i386 (32-bit): 320 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   782
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   783
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   784
Oracle Solaris/x64 (64-bit): 1024 KB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   785
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   786
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   787
Windows: depends on virtual memory
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   788
.RE
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   789
.RS
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   790
The following examples show how to set the thread stack size to 1024 KB in different units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   791
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   792
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   793
\f3\-XX:ThreadStackSize=1m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   794
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   795
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   796
\f3\-XX:ThreadStackSize=1024k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   797
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   798
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   799
\f3\-XX:ThreadStackSize=1048576\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   800
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   801
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   802
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   803
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   804
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   805
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   806
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   807
This option is equivalent to \f3-Xss\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   808
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   809
.RE
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   810
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   811
-XX:+TraceClassLoading
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   812
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   813
Enables tracing of classes as they are loaded\&. By default, this option is disabled and classes are not traced\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   814
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   815
-XX:+TraceClassLoadingPreorder
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   816
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   817
Enables tracing of all loaded classes in the order in which they are referenced\&. By default, this option is disabled and classes are not traced\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   818
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   819
-XX:+TraceClassResolution
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   820
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   821
Enables tracing of constant pool resolutions\&. By default, this option is disabled and constant pool resolutions are not traced\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   822
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   823
-XX:+TraceClassUnloading
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   824
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   825
Enables tracing of classes as they are unloaded\&. By default, this option is disabled and classes are not traced\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   826
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   827
-XX:+TraceLoaderConstraints
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   828
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   829
Enables tracing of the loader constraints recording\&. By default, this option is disabled and loader constraints recoding is not traced\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   830
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   831
-XX:+UseAltSigs
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   832
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   833
Enables the use of alternative signals instead of \f3SIGUSR1\fR and \f3SIGUSR2\fR for JVM internal signals\&. By default, this option is disabled and alternative signals are not used\&. This option is equivalent to \f3-Xusealtsigs\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   834
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   835
-XX:+UseBiasedLocking
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   836
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   837
Enables the use of biased locking\&. Some applications with significant amounts of uncontended synchronization may attain significant speedups with this flag enabled, whereas applications with certain patterns of locking may see slowdowns\&. For more information about the biased locking technique, see the example in Java Tuning White Paper at http://www\&.oracle\&.com/technetwork/java/tuning-139912\&.html#section4\&.2\&.5
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   838
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   839
By default, this option is disabled and biased locking is not used\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   840
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   841
-XX:+UseCompressedOops
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   842
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   843
Enables the use of compressed pointers\&. When this option is enabled, object references are represented as 32-bit offsets instead of 64-bit pointers, which typically increases performance when running the application with Java heap sizes less than 32 GB\&. This option works only for 64-bit JVMs\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   844
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   845
By default, this option is disabled and compressed pointers are not used\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   846
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   847
-XX:+UseLargePages
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   848
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   849
Enables the use of large page memory\&. This option is enabled by default\&. To disable the use of large page memory, specify \f3-XX:-UseLargePages\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   850
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   851
For more information, see Java Support for Large Memory Pages at http://www\&.oracle\&.com/technetwork/java/javase/tech/largememory-jsp-137182\&.html
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   852
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   853
-XX:+UseMembar
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   854
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   855
Enables issuing of membars on thread state transitions\&. This option is disabled by default on all platforms except Power PC and ARM servers, where it is enabled\&. To disable issuing of membars on thread state transitions for Power PC and ARM, specify \f3-XX:-UseMembar\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   856
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   857
-XX:+UsePerfData
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   858
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   859
Enables the \f3perfdata\fR feature\&. This option is enabled by default to allow JVM monitoring and performance testing\&. Disabling it suppresses the creation of the \f3hsperfdata_userid\fR directories\&. To disable the \f3perfdata\fR feature, specify \f3-XX:-UsePerfData\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   860
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   861
-XX:+AllowUserSignalHandlers
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   862
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   863
Enables installation of signal handlers by the application\&. By default, this option is disabled and the application is not allowed to install signal handlers\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   864
.SS ADVANCED\ JIT\ COMPILER\ OPTIONS    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   865
These options control the dynamic just-in-time (JIT) compilation performed by the Java HotSpot VM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   866
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   867
-XX:+AggressiveOpts
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   868
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   869
Enables the use of aggressive performance optimization features, which are expected to become default in upcoming releases\&. By default, this option is disabled and experimental performance features are not used\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   870
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   871
-XX:AllocateInstancePrefetchLines=\fIlines\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   872
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   873
Sets the number of lines to prefetch ahead of the instance allocation pointer\&. By default, the number of lines to prefetch is set to 1:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   874
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   875
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   876
\f3\-XX:AllocateInstancePrefetchLines=1\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   877
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   878
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   879
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   880
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   881
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   882
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   883
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   884
-XX:AllocatePrefetchInstr=\fIinstruction\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   885
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   886
Sets the prefetch instruction to prefetch ahead of the allocation pointer\&. Possible values are from 0 to 3\&. The actual instructions behind the values depend on the platform\&. By default, the prefetch instruction is set to 0:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   887
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   888
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   889
\f3\-XX:AllocatePrefetchInstr=0\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   890
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   891
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   892
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   893
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   894
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   895
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   896
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   897
-XX:AllocatePrefetchStepSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   898
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   899
Sets the step size (in bytes) for sequential prefetch instructions\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. By default, the step size is set to 16 bytes:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   900
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   901
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   902
\f3\-XX:AllocatePrefetchStepSize=16\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   903
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   904
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   905
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   906
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   907
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   908
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   909
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   910
-XX:+BackgroundCompilation
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   911
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   912
Enables background compilation\&. This option is enabled by default\&. To disable background compilation, specify \f3-XX:-BackgroundCompilation\fR (this is equivalent to specifying \f3-Xbatch\fR)\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   913
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   914
-XX:CICompilerCount=\fIthreads\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   915
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   916
Sets the number of compiler threads to use for compilation\&. By default, the number of threads is set to 2 for the server JVM, to 1 for the client JVM, and it scales to the number of cores if tiered compilation is used\&. The following example shows how to set the number of threads to 2:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   917
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   918
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   919
\f3\-XX:CICompilerCount=2\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   920
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   921
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   922
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   923
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   924
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   925
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   926
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   927
-XX:CodeCacheMinimumFreeSpace=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   928
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   929
Sets the minimum free space (in bytes) required for compilation\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. When less than the minimum free space remains, compiling stops\&. By default, this option is set to 500 KB\&. The following example shows how to set the minimum free space to 1024 MB:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   930
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   931
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   932
\f3\-XX:CodeCacheMinimumFreeSpace=1024m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   933
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   934
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   935
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   936
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   937
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   938
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   939
.TP
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   940
.nf
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   941
-XX:CompileCommand=\fIcommand\fR,\fIclass\fR\&.\fImethod\fR[,\fIoption\fR]
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   942
.br
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
   943
.fi
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   944
Attaches a line to the \f3\&.hotspot_compiler\fR file with the command for the specific method of the class\&. For example, to exclude the \f3indexOf()\fR method of the \f3String\fR class from being compiled, use the following:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   945
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   946
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   947
\f3\-XX:CompileCommand=exclude,java/lang/String\&.indexOf\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   948
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   949
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   950
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   951
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   952
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   953
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   954
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   955
Note that you must specify the full class name, including all packages and subpackages separated by a slash (\f3/\fR)\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   956
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   957
To add several commands, either specify this option multiple times, or separate each argument with the newline separator (\f3\en\fR)\&. To better understand the syntax of the JVM compiler commands, refer to the description of the \f3-XX:CompileCommandFile\fR option, which enables you to specify the file from which to read compiler commands\&. Notice how the syntax of the command file differs rom the syntax of the argument for the \f3-XX:CompileCommand\fR option\&. The commas and periods in the argument are aliases for spaces in the command file, making it easier to pass compiler commands through a shell\&. To pass arguments to \f3-XX:CompileCommand\fR with the same syntax as that used in the command file, you can enclose the argument in quotation marks:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   958
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   959
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   960
\f3\-XX:CompileCommand="exclude java/lang/String indexOf"\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   961
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   962
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   963
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   964
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   965
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   966
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   967
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   968
For easier cut and paste operations, it is also possible to use the method name format produced by the \f3-XX:+PrintCompilation\fR and \f3-XX:+LogCompilation\fR options:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   969
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   970
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   971
\f3\-XX:CompileCommand="exclude java\&.lang\&.String::indexOf"\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   972
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   973
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   974
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   975
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   976
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   977
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   978
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   979
The following commands are available:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   980
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   981
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   982
break
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   983
Set a breakpoint when debugging the JVM to stop at the beginning of compilation of the specified method\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   984
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   985
compileonly
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   986
Exclude all methods from compilation except for the specified method\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   987
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   988
dontinline
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   989
Prevent inlining of the specified method\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   990
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   991
exclude
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   992
Exclude the specified method from compilation\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   993
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   994
help
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   995
Print a help message for the \f3-XX:CompileCommand\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   996
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   997
inline
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   998
Attempt to inline the specified method\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
   999
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1000
log
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1001
Exclude compilation logging (with the \f3-XX:+LogCompilation\fR option) for all methods except for the specified method\&. By default, logging is performed for all compiled methods\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1002
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1003
print
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1004
Print generated assembler code after compilation of the specified method\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1005
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1006
quiet
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1007
Do not print the compile commands\&. By default, the commands that you specify with the -\f3XX:CompileCommand\fR option are printed; for example, if you exclude from compilation the \f3indexOf()\fR method of the \f3String\fR class, then the following will be printed to standard output:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1008
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1009
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1010
\f3CompilerOracle: exclude java/lang/String\&.indexOf\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1011
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1012
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1013
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1014
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1015
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1016
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1017
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1018
You can suppress this by specifying the \f3-XX:CompileCommand=quiet\fR option before other \f3-XX:CompileCommand\fR options\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1019
.RE     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1020
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1021
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1022
.RS
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1023
The optional last argument (\fIoption\fR) can be used to pass a JIT compilation option to the specified method\&. The compilation option is set at the end, after the method name\&. For example, to enable the \f3BlockLayoutByFrequency\fR option for the \f3append()\fR method of the \f3StringBuffer\fR class, use the following:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1024
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1025
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1026
\f3\-XX:CompileCommand=option,java/lang/StringBuffer\&.append,BlockLayoutByFrequency\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1027
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1028
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1029
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1030
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1031
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1032
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1033
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1034
.RE
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1035
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1036
-XX:CompileCommandFile=\fIfilename\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1037
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1038
Sets the file from which compiler commands are read\&. By default, the \f3\&.hotspot_compiler\fR file is used to store commands performed by the JVM compiler\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1039
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1040
Each line in the command file represents a command, a class name, and a method name for which the command is used (all three parts are separated by spaces)\&. For example, this line prints assembly code for the \f3toString()\fR method of the \f3String\fR class:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1041
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1042
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1043
\f3print java/lang/String toString\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1044
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1045
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1046
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1047
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1048
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1049
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1050
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1051
To add commands to the beginning of the \f3\&.hotspot_compiler\fR file, use the \f3-XX:CompileCommand\fR option\&. Note how the syntax of the command file is different from the syntax of the argument for the \f3-XX:CompileCommand\fR option\&. The commas and periods in the argument are aliases for spaces in the command file, making it easier to pass compiler commands through a shell\&. Although it is possible to pass arguments to \f3-XX:CompileCommand\fR with the same syntax as that used in the command file, you would have to enclose the string argument in quotation marks\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1052
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1053
-XX:CompileOnly=\fImethods\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1054
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1055
Sets the list of methods (separated by commas) to which compilation should be restricted\&. Only the specified methods will be compiled\&. Specify each method with the full class name (including the packages and subpackages)\&. For example, to compile only the \f3length()\fR method of the \f3String\fR class and the \f3size()\fR method of the \f3List\fR class, use the following:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1056
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1057
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1058
\f3\-XX:CompileOnly=java/lang/String\&.length,java/util/List\&.size\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1059
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1060
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1061
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1062
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1063
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1064
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1065
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1066
-XX:CompileThreshold=\fIinvocations\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1067
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1068
Sets the number of interpreted method invocations before compilation\&. By default, in the server JVM, the JIT compiler performs 10,000 interpreted method invocations to gather information for efficient compilation\&. For the client JVM, the default setting is 1,500 invocations\&. The following example shows how to set the number of interpreted method invocations to 5,000:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1069
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1070
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1071
\f3\-XX:CompileThreshold=5000\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1072
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1073
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1074
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1075
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1076
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1077
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1078
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1079
You can completely disable interpretation of Java methods before compilation by specifying the \f3-Xcomp\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1080
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1081
-XX:+DoEscapeAnalysis
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1082
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1083
Enables the use of escape analysis\&. This option is enabled by default\&. To disable the use of escape analysis, specify \f3-XX:-DoEscapeAnalysis\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1084
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1085
-XX:+FailOverToOldVerifier
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1086
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1087
Enables automatic failover to the old verifier when the new type checker fails\&. By default, this option is disabled and it is ignored (that is, treated as disabled) for classes with a recent bytecode version\&. You can enable it for classes with older versions of the bytecode\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1088
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1089
-XX:InitialCodeCacheSize=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1090
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1091
Sets the initial code cache size (in bytes)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. The default value is set to 500 KB\&. The following example shows how to set the initial code cache size to 32 KB:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1092
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1093
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1094
\f3\-XX:InitialCodeCacheSize=32k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1095
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1096
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1097
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1098
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1099
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1100
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1101
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1102
-XX:+Inline
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1103
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1104
Enables method inlining\&. This option is enabled by default to increase performance\&. To disable method inlining, specify \f3-XX:-Inline\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1105
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1106
-XX:InlineSmallCode=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1107
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1108
Sets the maximum code size (in bytes) for compiled methods that should be inlined\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. Only compiled methods with the size smaller than the specified size will be inlined\&. By default, the maximum code size is set to 1000 bytes:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1109
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1110
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1111
\f3\-XX:InlineSmallCode=1000\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1112
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1113
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1114
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1115
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1116
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1117
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1118
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1119
-XX:+LogCompilation
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1120
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1121
Enables logging of compilation activity to a file named \f3hotspot\&.log\fR in the current working directory\&. You can specify a different log file path and name using the \f3-XX:LogFile\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1122
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1123
By default, this option is disabled and compilation activity is not logged\&. The \f3-XX:+LogCompilation\fR option has to be used together with the \f3-XX:UnlockDiagnosticVMOptions\fR option that unlocks diagnostic JVM options\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1124
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1125
You can enable verbose diagnostic output with a message printed to the console every time a method is compiled by using the \f3-XX:+PrintCompilation\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1126
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1127
-XX:MaxInlineSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1128
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1129
Sets the maximum bytecode size (in bytes) of a method to be inlined\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. By default, the maximum bytecode size is set to 35 bytes:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1130
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1131
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1132
\f3\-XX:MaxInlineSize=35\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1133
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1134
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1135
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1136
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1137
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1138
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1139
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1140
-XX:MaxNodeLimit=\fInodes\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1141
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1142
Sets the maximum number of nodes to be used during single method compilation\&. By default, the maximum number of nodes is set to 65,000:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1143
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1144
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1145
\f3\-XX:MaxNodeLimit=65000\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1146
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1147
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1148
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1149
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1150
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1151
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1152
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1153
-XX:MaxTrivialSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1154
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1155
Sets the maximum bytecode size (in bytes) of a trivial method to be inlined\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. By default, the maximum bytecode size of a trivial method is set to 6 bytes:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1156
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1157
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1158
\f3\-XX:MaxTrivialSize=6\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1159
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1160
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1161
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1162
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1163
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1164
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1165
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1166
-XX:+OptimizeStringConcat
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1167
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1168
Enables the optimization of \f3String\fR concatenation operations\&. This option is enabled by default\&. To disable the optimization of \f3String\fR concatenation operations, specify \f3-XX:-OptimizeStringConcat\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1169
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1170
-XX:+PrintAssembly
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1171
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1172
Enables printing of assembly code for bytecoded and native methods by using the external \f3disassembler\&.so\fR library\&. This enables you to see the generated code, which may help you to diagnose performance issues\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1173
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1174
By default, this option is disabled and assembly code is not printed\&. The \f3-XX:+PrintAssembly\fR option has to be used together with the \f3-XX:UnlockDiagnosticVMOptions\fR option that unlocks diagnostic JVM options\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1175
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1176
-XX:+PrintCompilation
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1177
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1178
Enables verbose diagnostic output from the JVM by printing a message to the console every time a method is compiled\&. This enables you to see which methods actually get compiled\&. By default, this option is disabled and diagnostic output is not printed\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1179
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1180
You can also log compilation activity to a file by using the \f3-XX:+LogCompilation\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1181
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1182
-XX:+PrintInlining
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1183
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1184
Enables printing of inlining decisions\&. This enables you to see which methods are getting inlined\&.
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1185
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1186
By default, this option is disabled and inlining information is not printed\&. The \f3-XX:+PrintInlining\fR option has to be used together with the \f3-XX:+UnlockDiagnosticVMOptions\fR option that unlocks diagnostic JVM options\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1187
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1188
-XX:+RelaxAccessControlCheck
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1189
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1190
Decreases the amount of access control checks in the verifier\&. By default, this option is disabled, and it is ignored (that is, treated as disabled) for classes with a recent bytecode version\&. You can enable it for classes with older versions of the bytecode\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1191
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1192
-XX:ReservedCodeCacheSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1193
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1194
Sets the maximum code cache size (in bytes) for JIT-compiled code\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. This option is equivalent to \f3-Xmaxjitcodesize\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1195
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1196
-XX:+TieredCompilation
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1197
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1198
Enables the use of tiered compilation\&. By default, this option is disabled and tiered compilation is not used\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1199
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1200
-XX:+UseCodeCacheFlushing
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1201
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1202
Enables flushing of the code cache before shutting down the compiler\&. This option is enabled by default\&. To disable flushing of the code cache before shutting down the compiler, specify \f3-XX:-UseCodeCacheFlushing\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1203
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1204
-XX:+UseCondCardMark
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1205
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1206
Enables checking of whether the card is already marked before updating the card table\&. This option is disabled by default and should only be used on machines with multiple sockets, where it will increase performance of Java applications that rely heavily on concurrent operations\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1207
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1208
-XX:+UseSuperWord
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1209
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1210
Enables the transformation of scalar operations into superword operations\&. This option is enabled by default\&. To disable the transformation of scalar operations into superword operations, specify \f3-XX:-UseSuperWord\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1211
.SS ADVANCED\ SERVICEABILITY\ OPTIONS    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1212
These options provide the ability to gather system information and perform extensive debugging\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1213
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1214
-XX:+ExtendedDTraceProbes
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1215
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1216
Enables additional \f3dtrace\fR tool probes that impact the performance\&. By default, this option is disabled and \f3dtrace\fR performs only standard probes\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1217
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1218
-XX:+HeapDumpOnOutOfMemory
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1219
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1220
Enables the dumping of the Java heap to a file in the current directory by using the heap profiler (HPROF) when a \f3java\&.lang\&.OutOfMemoryError\fR exception is thrown\&. You can explicitly set the heap dump file path and name using the \f3-XX:HeapDumpPath\fR option\&. By default, this option is disabled and the heap is not dumped when an \f3OutOfMemoryError\fR exception is thrown\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1221
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1222
-XX:HeapDumpPath=\fIpath\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1223
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1224
Sets the path and file name for writing the heap dump provided by the heap profiler (HPROF) when the \f3-XX:+HeapDumpOnOutOfMemoryError\fR option is set\&. By default, the file is created in the current working directory, and it is named \f3java_pid\fR\fIpid\fR\f3\&.hprof\fR where \fIpid\fR is the identifier of the process that caused the error\&. The following example shows how to set the default file explicitly (\f3%p\fR represents the current process identificator):
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1225
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1226
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1227
\f3\-XX:HeapDumpPath=\&./java_pid%p\&.hprof\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1228
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1229
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1230
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1231
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1232
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1233
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1234
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1235
\fI\fRThe following example shows how to set the heap dump file to \f3/var/log/java/java_heapdump\&.hprof\fR:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1236
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1237
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1238
\f3\-XX:HeapDumpPath=/var/log/java/java_heapdump\&.hprof\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1239
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1240
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1241
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1242
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1243
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1244
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1245
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1246
-XX:LogFile=\fIpath\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1247
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1248
Sets the path and file name where log data is written\&. By default, the file is created in the current working directory, and it is named \f3hotspot\&.log\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1249
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1250
\fI\fRThe following example shows how to set the log file to \f3/var/log/java/hotspot\&.log\fR:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1251
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1252
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1253
\f3\-XX:LogFile=/var/log/java/hotspot\&.log\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1254
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1255
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1256
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1257
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1258
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1259
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1260
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1261
-XX:+PrintClassHistogram
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1262
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1263
\fI\fREnables printing of a class instance histogram after a \f3Control+C\fR event (\f3SIGTERM\fR)\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1264
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1265
Setting this option is equivalent to running the \f3jmap -histo\fR command, or the \f3jcmd\fR\fIpid\fR\f3GC\&.class_histogram\fR command, where \fIpid\fR is the current Java process identifier\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1266
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1267
-XX:+PrintConcurrentLocks
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1268
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1269
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1270
Enables printing of j\f3ava\&.util\&.concurrent\fR locks after a \f3Control+C\fR event (\f3SIGTERM\fR)\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1271
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1272
Setting this option is equivalent to running the \f3jstack -l\fR command or the \f3jcmd\fR\fIpid\fR\f3Thread\&.print -l\fR command, where \fIpid\fR is the current Java process identifier\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1273
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1274
-XX:+UnlockDiagnosticVMOptions
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1275
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1276
Unlocks the options intended for diagnosing the JVM\&. By default, this option is disabled and diagnostic options are not available\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1277
.SS ADVANCED\ GARBAGE\ COLLECTION\ OPTIONS    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1278
These options control how garbage collection (GC) is performed by the Java HotSpot VM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1279
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1280
-XX:+AggressiveHeap
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1281
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1282
Enables Java heap optimization\&. This sets various parameters to be optimal for long-running jobs with intensive memory allocation, based on the configuration of the computer (RAM and CPU)\&. By default, the option is disabled and the heap is not optimized\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1283
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1284
-XX:AllocatePrefetchDistance=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1285
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1286
Sets the size (in bytes) of the prefetch distance for object allocation\&. Memory about to be written with the value of new objects is prefetched up to this distance starting from the address of the last allocated object\&. Each Java thread has its own allocation point\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1287
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1288
Negative values denote that prefetch distance is chosen based on the platform\&. Positive values are bytes to prefetch\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. The default value is set to -1\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1289
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1290
The following example shows how to set the prefetch distance to 1024 bytes:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1291
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1292
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1293
\f3\-XX:AllocatePrefetchDistance=1024\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1294
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1295
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1296
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1297
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1298
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1299
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1300
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1301
-XX:AllocatePrefetchLines=\fIlines\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1302
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1303
Sets the number of cache lines to load after the last object allocation by using the prefetch instructions generated in compiled code\&. The default value is 1 if the last allocated object was an instance, and 3 if it was an array\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1304
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1305
The following example shows how to set the number of loaded cache lines to 5:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1306
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1307
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1308
\f3\-XX:AllocatePrefetchLines=5\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1309
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1310
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1311
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1312
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1313
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1314
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1315
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1316
-XX:AllocatePrefetchStyle=\fIstyle\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1317
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1318
Sets the generated code style for prefetch instructions\&. The \fIstyle\fR argument is an integer from 0 to 3:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1319
.RS     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1320
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1321
0
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1322
Do not generate prefetch instructions\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1323
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1324
1
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1325
Execute prefetch instructions after each allocation\&. This is the default parameter\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1326
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1327
2
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1328
Use the thread-local allocation block (TLAB) watermark pointer to determine when prefetch instructions are executed\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1329
.TP     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1330
3
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1331
Use BIS instruction on SPARC for allocation prefetch\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1332
.RE     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1333
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1334
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1335
-XX:+AlwaysPreTouch
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1336
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1337
Enables touching of every page on the Java heap during JVM initialization\&. This gets all pages into the memory before entering the \f3main()\fR method\&. The option can be used in testing to simulate a long-running system with all virtual memory mapped to physical memory\&. By default, this option is disabled and all pages are committed as JVM heap space fills\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1338
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1339
-XX:+CMSClassUnloadingEnabled
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1340
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1341
Enables class unloading when using the concurrent mark-sweep (CMS) garbage collector\&. This option is enabled by default\&. To disable class unloading for the CMS garbage collector, specify \f3-XX:-CMSClassUnloadingEnabled\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1342
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1343
-XX:CMSExpAvgFactor=\fIpercent\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1344
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1345
Sets the percentage of time (0 to 100) used to weight the current sample when computing exponential averages for the concurrent collection statistics\&. By default, the exponential averages factor is set to 25%\&. The following example shows how to set the factor to 15%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1346
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1347
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1348
\f3\-XX:CMSExpAvgFactor=15\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1349
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1350
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1351
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1352
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1353
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1354
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1355
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1356
-XX:CMSIncrementalDutyCycle=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1357
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1358
Sets the percentage of time (0 to 100) between minor collections that the concurrent collector is allowed to run\&. When \f3-XX:+CMSIncrementalPacing\fR is enabled, the duty cycle is set automatically, and this option sets only the initial value\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1359
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1360
By default, the duty cycle is set to 10%\&. The following example shows how to set the duty cycle to 20%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1361
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1362
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1363
\f3\-XX:CMSIncrementalDutyCycle=20\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1364
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1365
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1366
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1367
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1368
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1369
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1370
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1371
-XX:CMSIncrementalDutyCycleMin=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1372
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1373
Sets the percentage of time (0 to 100) between minor collections that is the lower bound for the duty cycle when \f3-XX:+CMSIncrementalPacing\fR is enabled\&. By default, the lower bound for the duty cycle is set to 0%\&. The following example shows how to set the lower bound to 10%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1374
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1375
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1376
\f3\-XX:CMSIncrementalDutyCycleMin=10\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1377
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1378
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1379
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1380
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1381
.sp     
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1382
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1383
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1384
-XX:+CMSIncrementalMode
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1385
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1386
Enables the incremental mode for the CMS collector\&. This option is disabled by default and should only be enabled for configurations with no more than two GC threads\&. All options that start with \f3CMSIncremental\fR apply only when this option is enabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1387
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1388
-XX:CMSIncrementalOffset=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1389
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1390
Sets the percentage of time (0 to 100) by which the incremental mode duty cycle is shifted to the right within the period between minor collections\&. By default, the offset is set to 0%\&. The following example shows how to set the duty cycle offset to 25%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1391
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1392
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1393
\f3\-XX:CMSIncrementalOffset=25\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1394
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1395
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1396
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1397
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1398
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1399
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1400
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1401
-XX:+CMSIncrementalPacing
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1402
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1403
Enables automatic adjustment of the incremental mode duty cycle based on statistics collected while the JVM is running\&. This option is enabled by default\&. To disable automatic adjustment of the incremental mode duty cycle, specify \f3-XX:-CMSIncrementalPacing\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1404
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1405
-XX:CMSIncrementalSafetyFactor=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1406
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1407
Sets the percentage of time (0 to 100) used to add conservatism when computing the duty cycle\&. By default, the safety factor is set to 10%\&. The example below shows how to set the safety factor to 5%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1408
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1409
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1410
\f3\-XX:CMSIncrementalSafetyFactor=5\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1411
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1412
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1413
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1414
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1415
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1416
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1417
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1418
-XX:CMSInitiatingOccupancyFraction=\fIpercent\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1419
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1420
Sets the percentage of the old generation occupancy (0 to 100) at which to start a CMS collection cycle\&. The default value is set to -1\&. Any negative value (including the default) implies that \f3-XX:CMSTriggerRatio\fR is used to define the value of the initiating occupancy fraction\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1421
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1422
The following example shows how to set the occupancy fraction to 20%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1423
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1424
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1425
\f3\-XX:CMSInitiatingOccupancyFraction=20\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1426
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1427
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1428
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1429
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1430
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1431
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1432
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1433
-XX:+CMSScavengeBeforeRemark
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1434
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1435
Enables scavenging attempts before the CMS remark step\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1436
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1437
-XX:CMSTriggerRatio=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1438
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1439
Sets the percentage (0 to 100) of the value specified by \f3-XX:MinHeapFreeRatio\fR that is allocated before a CMS collection cycle commences\&. The default value is set to 80%\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1440
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1441
The following example shows how to set the occupancy fraction to 75%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1442
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1443
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1444
\f3\-XX:CMSTriggerRatio=75\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1445
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1446
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1447
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1448
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1449
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1450
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1451
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1452
-XX:ConcGCThreads=\fIthreads\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1453
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1454
Sets the number of threads used for concurrent GC\&. The default value depends on the number of CPUs available to the JVM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1455
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1456
For example, to set the number of threads for concurrent GC to 2, specify the following option:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1457
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1458
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1459
\f3\-XX:ConcGCThreads=2\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1460
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1461
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1462
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1463
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1464
.sp     
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1465
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1466
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1467
-XX:+DisableExplicitGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1468
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1469
Enables the option that disables processing of calls to \f3System\&.gc()\fR\&. This option is disabled by default, meaning that calls to \f3System\&.gc()\fR are processed\&. If processing of calls to \f3System\&.gc()\fR is disabled, the JVM still performs GC when necessary\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1470
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1471
-XX:+ExplicitGCInvokesConcurrent
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1472
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1473
Enables invoking of concurrent GC by using the \f3System\&.gc()\fR request\&. This option is disabled by default and can be enabled only together with the \f3-XX:+UseConcMarkSweepGC\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1474
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1475
-XX:+ExplicitGCInvokesConcurrentAndUnloadsClasses
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1476
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1477
Enables invoking of concurrent GC by using the \f3System\&.gc()\fR request and unloading of classes during the concurrent GC cycle\&. This option is disabled by default and can be enabled only together with the \f3-XX:+UseConcMarkSweepGC\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1478
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1479
-XX:G1HeapRegionSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1480
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1481
Sets the size of the regions into which the Java heap is subdivided when using the garbage-first (G1) collector\&. The value can be between 1 MB and 32 MB\&. The default region size is determined ergonomically based on the heap size\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1482
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1483
The following example shows how to set the size of the subdivisions to 16 MB:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1484
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1485
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1486
\f3\-XX:G1HeapRegionSize=16m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1487
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1488
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1489
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1490
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1491
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1492
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1493
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1494
-XX:+G1PrintHeapRegions
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1495
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1496
Enables the printing of information about which regions are allocated and which are reclaimed by the G1 collector\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1497
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1498
-XX:G1ReservePercent=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1499
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1500
Sets the percentage of the heap (0 to 50) that is reserved as a false ceiling to reduce the possibility of promotion failure for the G1 collector\&. By default, this option is set to 10%\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1501
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1502
The following example shows how to set the reserved heap to 20%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1503
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1504
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1505
\f3\-XX:G1ReservePercent=20\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1506
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1507
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1508
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1509
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1510
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1511
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1512
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1513
-XX:InitialHeapSize=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1514
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1515
Sets the initial size (in bytes) of the memory allocation pool\&. This value must be either 0, or a multiple of 1024 and greater than 1 MB\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. The default value is chosen at runtime based on system configuration\&. For more information, see Garbage Collector Ergonomics at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/vm/gc-ergonomics\&.html
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1516
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1517
The following examples show how to set the size of allocated memory to 6 MB using various units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1518
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1519
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1520
\f3\-XX:InitialHeapSize=6291456\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1521
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1522
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1523
\f3\-XX:InitialHeapSize=6144k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1524
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1525
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1526
\f3\-XX:InitialHeapSize=6m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1527
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1528
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1529
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1530
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1531
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1532
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1533
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1534
If you set this option to 0, then the initial size will be set as the sum of the sizes allocated for the old generation and the young generation\&. The size of the heap for the young generation can be set using the \f3-XX:NewSize\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1535
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1536
-XX:InitialSurvivorRatio=\fIratio\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1537
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1538
Sets the initial survivor space ratio used by the throughput garbage collector (which is enabled by the \f3-XX:+UseParallelGC\fR and/or -\f3XX:+UseParallelOldGC\fR options)\&. Adaptive sizing is enabled by default with the throughput garbage collector by using the \f3-XX:+UseParallelGC\fR and \f3-XX:+UseParallelOldGC\fR options, and survivor space is resized according to the application behavior, starting with the initial value\&. If adaptive sizing is disabled (using the \f3-XX:-UseAdaptiveSizePolicy\fR option), then the \f3-XX:SurvivorRatio\fR option should be used to set the size of the survivor space for the entire execution of the application\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1539
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1540
The following formula can be used to calculate the initial size of survivor space (S) based on the size of the young generation (Y), and the initial survivor space ratio (R):
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1541
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1542
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1543
\f3S=Y/(R+2)\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1544
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1545
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1546
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1547
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1548
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1549
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1550
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1551
The 2 in the equation denotes two survivor spaces\&. The larger the value specified as the initial survivor space ratio, the smaller the initial survivor space size\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1552
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1553
By default, the initial survivor space ratio is set to 8\&. If the default value for the young generation space size is used (2 MB), the initial size of the survivor space will be 0\&.2 MB\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1554
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1555
The following example shows how to set the initial survivor space ratio to 4:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1556
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1557
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1558
\f3\-XX:InitialSurvivorRatio=4\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1559
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1560
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1561
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1562
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1563
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1564
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1565
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1566
-XX:InitiatingHeapOccupancyPercent=\fIpercent\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1567
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1568
Sets the percentage of the heap occupancy (0 to 100) at which to start a concurrent GC cycle\&. It is used by garbage collectors that trigger a concurrent GC cycle based on the occupancy of the entire heap, not just one of the generations (for example, the G1 garbage collector)\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1569
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1570
By default, the initiating value is set to 45%\&. A value of 0 implies nonstop GC cycles\&. The following example shows how to set the initiating heap occupancy to 75%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1571
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1572
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1573
\f3\-XX:InitiatingHeapOccupancyPercent=75\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1574
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1575
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1576
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1577
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1578
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1579
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1580
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1581
-XX:MaxGCPauseMillis=\fItime\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1582
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1583
Sets a target for the maximum GC pause time (in milliseconds)\&. This is a soft goal, and the JVM will make its best effort to achieve it\&. By default, there is no maximum pause time value\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1584
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1585
The following example shows how to set the maximum target pause time to 500 ms:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1586
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1587
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1588
\f3\-XX:MaxGCPauseMillis=500\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1589
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1590
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1591
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1592
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1593
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1594
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1595
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1596
-XX:MaxHeapSize=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1597
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1598
Sets the maximum size (in byes) of the memory allocation pool\&. This value must be a multiple of 1024 and greater than 2 MB\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. The default value is chosen at runtime based on system configuration\&. For server deployments, \f3-XX:InitialHeapSize\fR and \f3-XX:MaxHeapSize\fR are often set to the same value\&. For more information, see Garbage Collector Ergonomics at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/vm/gc-ergonomics\&.html
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1599
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1600
The following examples show how to set the maximum allowed size of allocated memory to 80 MB using various units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1601
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1602
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1603
\f3\-XX:MaxHeapSize=83886080\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1604
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1605
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1606
\f3\-XX:MaxHeapSize=81920k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1607
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1608
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1609
\f3\-XX:MaxHeapSize=80m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1610
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1611
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1612
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1613
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1614
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1615
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1616
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1617
On Oracle Solaris 7 and Oracle Solaris 8 SPARC platforms, the upper limit for this value is approximately 4,000 MB minus overhead amounts\&. On Oracle Solaris 2\&.6 and x86 platforms, the upper limit is approximately 2,000 MB minus overhead amounts\&. On Linux platforms, the upper limit is approximately 2,000 MB minus overhead amounts\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1618
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1619
The \f3-XX:MaxHeapSize\fR option is equivalent to \f3-Xmx\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1620
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1621
-XX:MaxHeapFreeRatio=\fIpercent\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1622
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1623
Sets the maximum allowed percentage of free heap space (0 to 100) after a GC event\&. If free heap space expands above this value, then the heap will be shrunk\&. By default, this value is set to 70%\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1624
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1625
The following example shows how to set the maximum free heap ratio to 75%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1626
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1627
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1628
\f3\-XX:MaxHeapFreeRatio=75\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1629
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1630
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1631
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1632
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1633
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1634
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1635
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1636
-XX:MaxMetaspaceSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1637
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1638
Sets the maximum amount of native memory that can be allocated for class metadata\&. By default, the size is not limited\&. The amount of metadata for an application depends on the application itself, other running applications, and the amount of memory available on the system\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1639
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1640
The following example shows how to set the maximum class metadata size to 256 MB:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1641
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1642
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1643
\f3\-XX:MaxMetaspaceSize=256m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1644
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1645
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1646
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1647
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1648
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1649
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1650
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1651
-XX:MaxNewSize=\fIsize\fR
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1652
.br
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1653
Sets the maximum size (in bytes) of the heap for the young generation (nursery)\&. The default value is set ergonomically\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1654
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1655
-XX:MaxTenuringThreshold=\fIthreshold\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1656
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1657
Sets the maximum tenuring threshold for use in adaptive GC sizing\&. The largest value is 15\&. The default value is 15 for the parallel (throughput) collector, and 6 for the CMS collector\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1658
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1659
The following example shows how to set the maximum tenuring threshold to 10:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1660
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1661
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1662
\f3\-XX:MaxTenuringThreshold=10\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1663
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1664
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1665
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1666
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1667
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1668
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1669
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1670
-XX:MetaspaceSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1671
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1672
Sets the size of the allocated class metadata space that will trigger a garbage collection the first time it is exceeded\&. This threshold for a garbage collection is increased or decreased depending on the amount of metadata used\&. The default size depends on the platform\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1673
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1674
-XX:MinHeapFreeRatio=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1675
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1676
Sets the minimum allowed percentage of free heap space (0 to 100) after a GC event\&. If free heap space falls below this value, then the heap will be expanded\&. By default, this value is set to 40%\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1677
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1678
The following example shows how to set the minimum free heap ratio to 25%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1679
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1680
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1681
\f3\-XX:MinHeapFreeRatio=25\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1682
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1683
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1684
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1685
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1686
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1687
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1688
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1689
-XX:NewRatio=\fIratio\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1690
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1691
Sets the ratio between young and old generation sizes\&. By default, this option is set to 2\&. The following example shows how to set the young/old ratio to 1:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1692
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1693
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1694
\f3\-XX:NewRatio=1\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1695
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1696
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1697
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1698
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1699
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1700
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1701
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1702
-XX:NewSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1703
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1704
Sets the initial size (in bytes) of the heap for the young generation (nursery)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1705
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1706
The young generation region of the heap is used for new objects\&. GC is performed in this region more often than in other regions\&. If the size for the young generation is too low, then a large number of minor GCs will be performed\&. If the size is too high, then only full GCs will be performed, which can take a long time to complete\&. Oracle recommends that you keep the size for the young generation between a half and a quarter of the overall heap size\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1707
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1708
The following examples show how to set the initial size of young generation to 256 MB using various units:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1709
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1710
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1711
\f3\-XX:NewSize=256m\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1712
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1713
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1714
\f3\-XX:NewSize=262144k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1715
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1716
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1717
\f3\-XX:NewSize=268435456\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1718
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1719
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1720
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1721
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1722
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1723
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1724
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1725
The \f3-XX:NewSize\fR option is equivalent to \f3-Xmn\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1726
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1727
-XX:ParallelGCThreads=\fIthreads\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1728
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1729
Sets the number of threads used for parallel garbage collection in the young and old generations\&. The default value depends on the number of CPUs available to the JVM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1730
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1731
For example, to set the number of threads for parallel GC to 2, specify the following option:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1732
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1733
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1734
\f3\-XX:ParallelGCThreads=2\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1735
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1736
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1737
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1738
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1739
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1740
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1741
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1742
-XX:+ParallelRefProcEnabled
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1743
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1744
Enables parallel reference processing\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1745
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1746
-XX:+PrintAdaptiveSizePolicy
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1747
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1748
Enables printing of information about adaptive generation sizing\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1749
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1750
-XX:+PrintGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1751
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1752
Enables printing of messages at every GC\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1753
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1754
-XX:+PrintGCApplicationConcurrentTime
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1755
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1756
Enables printing of how much time elapsed since the last pause (for example, a GC pause)\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1757
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1758
-XX:+PrintGCApplicationStoppedTime
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1759
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1760
Enables printing of how much time the pause (for example, a GC pause) lasted\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1761
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1762
-XX+PrintGCDateStamp
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1763
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1764
Enables printing of a date stamp at every GC\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1765
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1766
-XX:+PrintGCDetails
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1767
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1768
Enables printing of detailed messages at every GC\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1769
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1770
-XX:+PrintGCTaskTimeStamps
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1771
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1772
Enables printing of time stamps for every individual GC worker thread task\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1773
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1774
-XX:+PrintGCTimeStamp
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1775
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1776
Enables printing of time stamps at every GC\&. By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1777
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1778
-XX:+PrintTenuringDistribution
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1779
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1780
Enables printing of tenuring age information\&. The following is an example of the output:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1781
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1782
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1783
\f3Desired survivor size 48286924 bytes, new threshold 10 (max 10)\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1784
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1785
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1786
\f3\- age 1: 28992024 bytes, 28992024 total\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1787
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1788
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1789
\f3\- age 2: 1366864 bytes, 30358888 total\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1790
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1791
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1792
\f3\- age 3: 1425912 bytes, 31784800 total\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1793
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1794
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1795
\f3\&.\&.\&.\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1796
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1797
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1798
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1799
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1800
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1801
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1802
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1803
Age 1 objects are the youngest survivors (they were created after the previous scavenge, survived the latest scavenge, and moved from eden to survivor space)\&. Age 2 objects have survived two scavenges (during the second scavenge they were copied from one survivor space to the next)\&. And so on\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1804
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1805
In the preceding example, 28 992 024 bytes survived one scavenge and were copied from eden to survivor space, 1 366 864 bytes are occupied by age 2 objects, etc\&. The third value in each row is the cumulative size of objects of age n or less\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1806
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1807
By default, this option is disabled\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1808
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1809
-XX:+ScavengeBeforeFullGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1810
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1811
Enables GC of the young generation before each full GC\&. This option is enabled by default\&. Oracle recommends that you \fIdo not\fR disable it, because scavenging the young generation before a full GC can reduce the number of objects reachable from the old generation space into the young generation space\&. To disable GC of the young generation before each full GC, specify \f3-XX:-ScavengeBeforeFullGC\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1812
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1813
-XX:SoftRefLRUPolicyMSPerMB=\fItime\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1814
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1815
Sets the amount of time (in milliseconds) a softly reachable object is kept active on the heap after the last time it was referenced\&. The default value is one second of lifetime per free megabyte in the heap\&. The \f3-XX:SoftRefLRUPolicyMSPerMB\fR option accepts integer values representing milliseconds per one megabyte of the current heap size (for Java HotSpot Client VM) or the maximum possible heap size (for Java HotSpot Server VM)\&. This difference means that the Client VM tends to flush soft references rather than grow the heap, whereas the Server VM tends to grow the heap rather than flush soft references\&. In the latter case, the value of the \f3-Xmx\fR option has a significant effect on how quickly soft references are garbage collected\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1816
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1817
The following example shows how to set the value to 2\&.5 seconds:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1818
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1819
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1820
\f3\-XX:SoftRefLRUPolicyMSPerMB=2500\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1821
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1822
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1823
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1824
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1825
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1826
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1827
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1828
-XX:SurvivorRatio=\fIratio\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1829
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1830
Sets the ratio between eden space size and survivor space size\&. By default, this option is set to 8\&. The following example shows how to set the eden/survivor space ratio to 4:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1831
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1832
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1833
\f3\-XX:SurvivorRatio=4\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1834
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1835
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1836
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1837
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1838
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1839
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1840
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1841
-XX:TargetSurvivorRatio=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1842
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1843
Sets the desired percentage of survivor space (0 to 100) used after young garbage collection\&. By default, this option is set to 50%\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1844
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1845
The following example shows how to set the target survivor space ratio to 30%:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1846
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1847
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1848
\f3\-XX:TargetSurvivorRatio=30\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1849
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1850
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1851
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1852
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1853
.sp     
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1854
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1855
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1856
-XX:TLABSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1857
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1858
Sets the initial size (in bytes) of a thread-local allocation buffer (TLAB)\&. Append the letter \f3k\fR or \f3K\fR to indicate kilobytes, \f3m\fR or \f3M\fR to indicate megabytes, \f3g\fR or \f3G\fR to indicate gigabytes\&. If this option is set to 0, then the JVM chooses the initial size automatically\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1859
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1860
The following example shows how to set the initial TLAB size to 512 KB:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1861
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1862
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1863
\f3\-XX:TLABSize=512k\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1864
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1865
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1866
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1867
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1868
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1869
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1870
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1871
-XX:+UseAdaptiveSizePolicy
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1872
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1873
Enables the use of adaptive generation sizing\&. This option is enabled by default\&. To disable adaptive generation sizing, specify \f3-XX:-UseAdaptiveSizePolicy\fR and set the size of the memory allocation pool explicitly (see the \f3-XX:SurvivorRatio\fR option)\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1874
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1875
-XX:+UseCMSInitiatingOccupancyOnly
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1876
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1877
Enables the use of the occupancy value as the only criterion for initiating the CMS collector\&. By default, this option is disabled and other criteria may be used\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1878
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1879
-XX:+UseConcMarkSweepGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1880
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1881
Enables the use of the CMS garbage collector for the old generation\&. Oracle recommends that you use the CMS garbage collector when application latency requirements cannot be met by the throughput (\f3-XX:+UseParallelGC\fR) garbage collector\&. The G1 garbage collector (\f3-XX:+UseG1GC\fR) is another alternative\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1882
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1883
By default, this option is disabled and the collector is chosen automatically based on the configuration of the machine and type of the JVM\&. When this option is enabled, the \f3-XX:+UseParNewGC\fR option is automatically set\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1884
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1885
-XX:+UseG1GC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1886
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1887
Enables the use of the G1 garbage collector\&. It is a server-style garbage collector, targeted for multiprocessor machines with a large amount of RAM\&. It meets GC pause time goals with high probability, while maintaining good throughput\&. The G1 collector is recommended for applications requiring large heaps (sizes of around 6 GB or larger) with limited GC latency requirements (stable and predictable pause time below 0\&.5 seconds)\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1888
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1889
By default, this option is disabled and the collector is chosen automatically based on the configuration of the machine and type of the JVM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1890
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1891
-XX:+UseGCOverheadLimit
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1892
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1893
Enables the use of a policy that limits the proportion of time spent by the JVM on GC before an \f3OutOfMemoryError\fR exception is thrown\&. This option is enabled, by default and the parallel GC will throw an \f3OutOfMemoryError\fR if more than 98% of the total time is spent on garbage collection and less than 2% of the heap is recovered\&. When the heap is small, this feature can be used to prevent applications from running for long periods of time with little or no progress\&. To disable this option, specify \f3-XX:-UseGCOverheadLimit\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1894
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1895
-XX:+UseNUMA
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1896
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1897
Enables performance optimization of an application on a machine with nonuniform memory architecture (NUMA) by increasing the application\&'s use of lower latency memory\&. By default, this option is disabled and no optimization for NUMA is made\&. The option is only available when the parallel garbage collector is used (\f3-XX:+UseParallelGC\fR)\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1898
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1899
-XX:+UseParallelGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1900
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1901
Enables the use of the parallel scavenge garbage collector (also known as the throughput collector) to improve the performance of your application by leveraging multiple processors\&.
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1902
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1903
By default, this option is disabled and the collector is chosen automatically based on the configuration of the machine and type of the JVM\&. If it is enabled, then the \f3-XX:+UseParallelOldGC\fR option is automatically enabled, unless you explicitly disable it\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1904
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1905
-XX:+UseParallelOldGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1906
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1907
Enables the use of the parallel garbage collector for full GCs\&. By default, this option is disabled\&. Enabling it automatically enables the \f3-XX:+UseParallelGC\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1908
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1909
-XX:+UseParNewGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1910
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1911
Enables the use of parallel threads for collection in the young generation\&. By default, this option is disabled\&. It is automatically enabled when you set the \f3-XX:+UseConcMarkSweepGC\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1912
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1913
-XX:+UseSerialGC
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1914
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1915
Enables the use of the serial garbage collector\&. This is generally the best choice for small and simple applications that do not require any special functionality from garbage collection\&. By default, this option is disabled and the collector is chosen automatically based on the configuration of the machine and type of the JVM\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1916
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1917
-XX:+UseTLAB
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1918
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1919
Enables the use of thread-local allocation blocks (TLABs) in the young generation space\&. This option is enabled by default\&. To disable the use of TLABs, specify \f3-XX:-UseTLAB\fR\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1920
.SS DEPRECATED\ AND\ REMOVED\ OPTIONS    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1921
These options were included in the previous release, but have since been considered unnecessary\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1922
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1923
-Xrun\fIlibname\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1924
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1925
Loads the specified debugging/profiling library\&. This option was superseded by the \f3-agentlib\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1926
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1927
-XX:CMSInitiatingPermOccupancyFraction=\fIpercent\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1928
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1929
Sets the percentage of the permanent generation occupancy (0 to 100) at which to start a GC\&. This option was deprecated in JDK 8 with no replacement\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1930
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1931
-XX:MaxPermSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1932
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1933
Sets the maximum permanent generation space size (in bytes)\&. This option was deprecated in JDK 8, and superseded by the \f3-XX:MaxMetaspaceSize\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1934
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1935
-XX:PermSize=\fIsize\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1936
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1937
Sets the space (in bytes) allocated to the permanent generation that triggers a garbage collection if it is exceeded\&. This option was deprecated un JDK 8, and superseded by the \f3-XX:MetaspaceSize\fR option\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1938
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1939
-XX:+UseSplitVerifier
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1940
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1941
Enables splitting of the verification process\&. By default, this option was enabled in the previous releases, and verification was split into two phases: type referencing (performed by the compiler) and type checking (performed by the JVM runtime)\&. This option was deprecated in JDK 8, and verification is now split by default without a way to disable it\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1942
.TP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1943
-XX:+UseStringCache
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1944
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1945
Enables caching of commonly allocated strings\&. This option was removed from JDK 8 with no replacement\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1946
.SH PERFORMANCE\ TUNING\ EXAMPLES    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1947
The following examples show how to use experimental tuning flags to either optimize throughput or to provide lower response time\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1948
.PP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1949
\f3Example 1 Tuning for Higher Throughput\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1950
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
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parents: 14342
diff changeset
  1951
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1952
\f3java \-d64 \-server \-XX:+AggressiveOpts \-XX:+UseLargePages \-Xmn10g  \-Xms26g \-Xmx26g\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1953
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1954
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1955
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1956
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1957
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
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parents: 14342
diff changeset
  1958
\f3Example 2 Tuning for Lower Response Time\fR
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1959
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1960
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1961
\f3java \-d64 \-XX:+UseG1GC \-Xms26g Xmx26g \-XX:MaxGCPauseMillis=500 \-XX:+PrintGCTimeStamp\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1962
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1963
.nf     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1964
\f3\fP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1965
.fi     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1966
.sp     
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1967
.SH EXIT\ STATUS    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1968
The following exit values are typically returned by the launcher when the launcher is called with the wrong arguments, serious errors, or exceptions thrown by the JVM\&. However, a Java application may choose to return any value by using the API call \f3System\&.exit(exitValue)\fR\&. The values are:
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1969
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1970
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1971
\f30\fR: Successful completion
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1972
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1973
\(bu
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1974
\f3>0\fR: An error occurred
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1975
.SH SEE\ ALSO    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1976
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1977
\(bu
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1978
javac(1)
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1979
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1980
\(bu
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1981
jdb(1)
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1982
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1983
\(bu
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1984
javah(1)
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1985
.TP 0.2i    
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1986
\(bu
12047
320a714614e9 7113349: Initial changeset for Macosx port to jdk
michaelm
parents:
diff changeset
  1987
jar(1)
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1988
.RE
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1989
.br
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1990
'pl 8.5i
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 14342
diff changeset
  1991
'bp