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src/linux/doc/man/jhat.1
changeset 47216 71c04702a3d5
parent 31876 91b22707521a 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/linux/doc/man/jhat.1	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,136 @@
+'\" t
+.\" Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
+.\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+.\"
+.\" This code is free software; you can redistribute it and/or modify it
+.\" under the terms of the GNU General Public License version 2 only, as
+.\" published by the Free Software Foundation.
+.\"
+.\" This code is distributed in the hope that it will be useful, but WITHOUT
+.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+.\" FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+.\" version 2 for more details (a copy is included in the LICENSE file that
+.\" accompanied this code).
+.\"
+.\" You should have received a copy of the GNU General Public License version
+.\" 2 along with this work; if not, write to the Free Software Foundation,
+.\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+.\"
+.\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+.\" or visit www.oracle.com if you need additional information or have any
+.\" questions.
+.\"
+.\"     Arch: generic
+.\"     Software: JDK 8
+.\"     Date: 21 November 2013
+.\"     SectDesc: Troubleshooting Tools
+.\"     Title: jhat.1
+.\"
+.if n .pl 99999
+.TH jhat 1 "21 November 2013" "JDK 8" "Troubleshooting Tools"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+
+.SH NAME    
+jhat \- Analyzes the Java heap\&. This command is experimental and unsupported\&.
+.SH SYNOPSIS    
+.sp     
+.nf     
+
+\fBjhat\fR [ \fIoptions\fR ] \fIheap\-dump\-file\fR 
+.fi     
+.sp     
+.TP     
+\fIoptions\fR
+The command-line options\&. See Options\&.
+.TP     
+\fIheap-dump-file\fR
+Java binary heap dump file to be browsed\&. For a dump file that contains multiple heap dumps, you can specify which dump in the file by appending \f3#<number>\fR to the file name, for example, \f3myfile\&.hprof#3\fR\&.
+.SH DESCRIPTION    
+The \f3jhat\fR command parses a Java heap dump file and starts a web server\&. The \f3jhat\fR command lets you to browse heap dumps with your favorite web browser\&. The \f3jhat\fR command supports predesigned queries such as show all instances of a known class \f3MyClass\fR, and Object Query Language (OQL)\&. OQL is similar to SQL, except for querying heap dumps\&. Help on OQL is available from the OQL help page shown by the \f3jhat\fR command\&. With the default port, OQL help is available at http://localhost:7000/oqlhelp/
+.PP
+There are several ways to generate a Java heap dump:
+.TP 0.2i    
+\(bu
+Use the \f3jmap -dump\fR option to obtain a heap dump at runtime\&. See jmap(1)\&.
+.TP 0.2i    
+\(bu
+Use the \f3jconsole\fR option to obtain a heap dump through \f3HotSpotDiagnosticMXBean\fR at runtime\&. See jconsole(1) and the \f3HotSpotDiagnosticMXBean\fR interface description at http://docs\&.oracle\&.com/javase/8/docs/jre/api/management/extension/com/sun/management/HotSpotDiagnosticMXBean\&.html
+.TP 0.2i    
+\(bu
+Heap dump is generated when an \f3OutOfMemoryError\fR is thrown by specifying the \f3-XX:+HeapDumpOnOutOfMemoryError\fR Java Virtual Machine (JVM) option\&.
+.TP 0.2i    
+\(bu
+Use the \f3hprof\fR command\&. See the HPROF: A Heap/CPU Profiling Tool at http://docs\&.oracle\&.com/javase/8/docs/technotes/samples/hprof\&.html
+.SH OPTIONS    
+.TP
+-stack false|true
+.br
+Turns off tracking object allocation call stack\&. If allocation site information is not available in the heap dump, then you have to set this flag to \f3false\fR\&. The default is \f3true\fR\&.
+.TP
+-refs false|true
+.br
+Turns off tracking of references to objects\&. Default is \f3true\fR\&. By default, back pointers, which are objects that point to a specified object such as referrers or incoming references, are calculated for all objects in the heap\&.
+.TP
+-port \fIport-number\fR
+.br
+Sets the port for the \f3jhat\fR HTTP server\&. Default is 7000\&.
+.TP
+-exclude \fIexclude-file\fR
+.br
+Specifies a file that lists data members that should be excluded from the reachable objects query\&. For example, if the file lists \f3java\&.lang\&.String\&.value\fR, then, then whenever the list of objects that are reachable from a specific object \f3o\fR are calculated, reference paths that involve \f3java\&.lang\&.String\&.value\fR field are not considered\&.
+.TP
+-baseline \fIexclude-file\fR
+.br
+Specifies a baseline heap dump\&. Objects in both heap dumps with the same object ID are marked as not being new\&. Other objects are marked as new\&. This is useful for comparing two different heap dumps\&.
+.TP
+-debug \fIint\fR
+.br
+Sets the debug level for this tool\&. A level of 0 means no debug output\&. Set higher values for more verbose modes\&.
+.TP
+-version
+.br
+Reports the release number and exits
+.TP
+-h
+.br
+Dsiplays a help message and exits\&.
+.TP
+-help
+.br
+Displays a help message and exits\&.
+.TP
+-J\fIflag\fR
+.br
+Passes \f3flag\fR to the Java Virtual Machine on which the \f3jhat\fR command is running\&. For example, \f3-J-Xmx512m\fR to use a maximum heap size of 512 MB\&.
+.SH SEE\ ALSO    
+.TP 0.2i    
+\(bu
+jmap(1)
+.TP 0.2i    
+\(bu
+jconsole(1)
+.TP 0.2i    
+\(bu
+HPROF: A Heap/CPU Profiling Tool at http://docs\&.oracle\&.com/javase/8/docs/technotes/samples/hprof\&.html
+.RE
+.br
+'pl 8.5i
+'bp
jdk-sandbox