src/linux/doc/man/jstat.1
author dlong
Wed, 31 Jan 2018 16:10:23 -0800
changeset 48858 e50e326a2bfc
parent 47216 71c04702a3d5
permissions -rw-r--r--
8194990: 3 Null pointer dereference defect groups related to CodeCache::find_blob_unsafe() Reviewed-by: kvn
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'\" t
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.\" Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved.
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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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.\" Title: jstat
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.\" Language: English
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.\" Date: 03 March 2015
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.\" SectDesc: Monitoring Tools
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.\" Software: JDK 8
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.\" Arch: generic
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.\" Part Number: E38207-04
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.\" Doc ID: JSSON
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.\"
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.if n .pl 99999
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.TH "jstat" "1" "03 March 2015" "JDK 8" "Monitoring 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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jstat \- Monitors Java Virtual Machine (JVM) statistics\&. This command is experimental and unsupported\&.
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.SH "SYNOPSIS"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fBjstat\fR [ \fIgeneralOption\fR | \fIoutputOptions vmid\fR [ \fIinterval\fR[s|ms] [ \fIcount \fR] ]
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.fi
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.if n \{\
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.RE
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.\}
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.PP
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\fIgeneralOption\fR
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.RS 4
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A single general command\-line option
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\fB\-help\fR
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or
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\fB\-options\fR\&. See General Options\&.
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.RE
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.PP
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\fIoutputOptions\fR
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.RS 4
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One or more output options that consist of a single
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\fBstatOption\fR, plus any of the
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\fB\-t\fR,
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\fB\-h\fR, and
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\fB\-J\fR
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options\&. See Output Options\&.
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.RE
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.PP
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\fIvmid\fR
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.RS 4
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Virtual machine identifier, which is a string that indicates the target JVM\&. The general syntax is the following:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fB[protocol:][//]lvmid[@hostname[:port]/servername]\fR
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.fi
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.if n \{\
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.RE
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.\}
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The syntax of the
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\fBvmid\fR
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string corresponds to the syntax of a URI\&. The
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\fBvmid\fR
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string can vary from a simple integer that represents a local JVM to a more complex construction that specifies a communications protocol, port number, and other implementation\-specific values\&. See Virtual Machine Identifier\&.
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.RE
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.PP
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\fIinterval\fR [s|ms]
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.RS 4
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Sampling interval in the specified units, seconds (s) or milliseconds (ms)\&. Default units are milliseconds\&. Must be a positive integer\&. When specified, the
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\fBjstat\fR
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command produces its output at each interval\&.
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.RE
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.PP
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\fIcount\fR
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.RS 4
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Number of samples to display\&. The default value is infinity which causes the
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\fBjstat\fR
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command to display statistics until the target JVM terminates or the
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\fBjstat\fR
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command is terminated\&. This value must be a positive integer\&.
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.RE
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.SH "DESCRIPTION"
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.PP
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The
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\fBjstat\fR
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command displays performance statistics for an instrumented Java HotSpot VM\&. The target JVM is identified by its virtual machine identifier, or
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\fBvmid\fR
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option\&.
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.SH "VIRTUAL MACHINE IDENTIFIER"
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.PP
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The syntax of the
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\fBvmid\fR
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string corresponds to the syntax of a URI:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fB[protocol:][//]lvmid[@hostname[:port]/servername]\fR
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.fi
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.if n \{\
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.RE
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.\}
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.PP
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\fIprotocol\fR
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.RS 4
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The communications protocol\&. If the
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\fIprotocol\fR
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value is omitted and a host name is not specified, then the default protocol is a platform\-specific optimized local protocol\&. If the
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\fIprotocol\fR
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value is omitted and a host name is specified, then the default protocol is
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\fBrmi\fR\&.
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.RE
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.PP
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\fIlvmid\fR
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.RS 4
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The local virtual machine identifier for the target JVM\&. The
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\fBlvmid\fR
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is a platform\-specific value that uniquely identifies a JVM on a system\&. The
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\fBlvmid\fR
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is the only required component of a virtual machine identifier\&. The
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\fBlvmid\fR
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is typically, but not necessarily, the operating system\*(Aqs process identifier for the target JVM process\&. You can use the
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\fBjps\fR
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command to determine the
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\fBlvmid\fR\&. Also, you can determine the
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\fBlvmid\fR
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on Solaris, Linux, and OS X platforms with the
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\fBps\fR
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command, and on Windows with the Windows Task Manager\&.
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.RE
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.PP
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\fIhostname\fR
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.RS 4
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A hostname or IP address that indicates the target host\&. If the
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\fIhostname\fR
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value is omitted, then the target host is the local host\&.
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.RE
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.PP
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\fIport\fR
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.RS 4
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The default port for communicating with the remote server\&. If the
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\fIhostname\fR
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value is omitted or the
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\fIprotocol\fR
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value specifies an optimized, local protocol, then the
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\fIport\fR
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value is ignored\&. Otherwise, treatment of the
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\fBport\fR
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parameter is implementation\-specific\&. For the default
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\fBrmi\fR
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protocol, the port value indicates the port number for the rmiregistry on the remote host\&. If the
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\fIport\fR
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value is omitted and the
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\fIprotocol\fR
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value indicates
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\fBrmi\fR, then the default rmiregistry port (1099) is used\&.
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.RE
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.PP
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\fIservername\fR
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.RS 4
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The treatment of the
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\fBservername\fR
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parameter depends on implementation\&. For the optimized local protocol, this field is ignored\&. For the
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\fBrmi\fR
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protocol, it represents the name of the RMI remote object on the remote host\&.
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.RE
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.SH "OPTIONS"
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.PP
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The
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\fBjstat\fR
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command supports two types of options, general options and output options\&. General options cause the
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\fBjstat\fR
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command to display simple usage and version information\&. Output options determine the content and format of the statistical output\&.
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.PP
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All options and their functionality are subject to change or removal in future releases\&.
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.SS "General Options"
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.PP
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If you specify one of the general options, then you cannot specify any other option or parameter\&.
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.PP
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\-help
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.RS 4
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Displays a help message\&.
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.RE
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.PP
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\-options
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.RS 4
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Displays a list of static options\&. See Output Options\&.
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.RE
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.SS "Output Options"
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.PP
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If you do not specify a general option, then you can specify output options\&. Output options determine the content and format of the
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\fBjstat\fR
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command\*(Aqs output, and consist of a single
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\fBstatOption\fR, plus any of the other output options (\fB\-h\fR,
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\fB\-t\fR, and
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\fB\-J\fR)\&. The
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\fBstatOption\fR
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must come first\&.
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.PP
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Output is formatted as a table, with columns that are separated by spaces\&. A header row with titles describes the columns\&. Use the
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\fB\-h\fR
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option to set the frequency at which the header is displayed\&. Column header names are consistent among the different options\&. In general, if two options provide a column with the same name, then the data source for the two columns is the same\&.
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.PP
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Use the
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\fB\-t\fR
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option to display a time stamp column, labeled Timestamp as the first column of output\&. The Timestamp column contains the elapsed time, in seconds, since the target JVM started\&. The resolution of the time stamp is dependent on various factors and is subject to variation due to delayed thread scheduling on heavily loaded systems\&.
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.PP
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Use the interval and count parameters to determine how frequently and how many times, respectively, the
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\fBjstat\fR
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command displays its output\&.
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.PP
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\fBNote:\fR
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Do not to write scripts to parse the
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\fBjstat\fR
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command\*(Aqs output because the format might change in future releases\&. If you write scripts that parse
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\fBjstat\fR
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command output, then expect to modify them for future releases of this tool\&.
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.PP
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\-\fIstatOption\fR
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.RS 4
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Determines the statistics information the
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\fBjstat\fR
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command displays\&. The following lists the available options\&. Use the
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\fB\-options\fR
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general option to display the list of options for a particular platform installation\&. See Stat Options and Output\&.
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.sp
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\fBclass\fR: Displays statistics about the behavior of the class loader\&.
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.sp
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\fBcompiler\fR: Displays statistics about the behavior of the Java HotSpot VM Just\-in\-Time compiler\&.
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.sp
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\fBgc\fR: Displays statistics about the behavior of the garbage collected heap\&.
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.sp
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\fBgccapacity\fR: Displays statistics about the capacities of the generations and their corresponding spaces\&.
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.sp
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\fBgccause\fR: Displays a summary about garbage collection statistics (same as
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\fB\-gcutil\fR), with the cause of the last and current (when applicable) garbage collection events\&.
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.sp
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\fBgcnew\fR: Displays statistics of the behavior of the new generation\&.
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.sp
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\fBgcnewcapacity\fR: Displays statistics about the sizes of the new generations and its corresponding spaces\&.
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.sp
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\fBgcold\fR: Displays statistics about the behavior of the old generation and metaspace statistics\&.
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.sp
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\fBgcoldcapacity\fR: Displays statistics about the sizes of the old generation\&.
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.sp
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\fBgcmetacapacity\fR: Displays statistics about the sizes of the metaspace\&.
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.sp
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\fBgcutil\fR: Displays a summary about garbage collection statistics\&.
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.sp
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\fBprintcompilation\fR: Displays Java HotSpot VM compilation method statistics\&.
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.RE
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.PP
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\-h \fIn\fR
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.RS 4
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Displays a column header every
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\fIn\fR
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samples (output rows), where
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\fIn\fR
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is a positive integer\&. Default value is 0, which displays the column header the first row of data\&.
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.RE
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.PP
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\-t
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.RS 4
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Displays a timestamp column as the first column of output\&. The time stamp is the time since the start time of the target JVM\&.
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.RE
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.PP
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\-J\fIjavaOption\fR
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.RS 4
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Passes
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\fBjavaOption\fR
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to the Java application launcher\&. For example,
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\fB\-J\-Xms48m\fR
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sets the startup memory to 48 MB\&. For a complete list of options, see
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java(1)\&.
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.RE
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.SS "Stat Options and Output"
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.PP
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The following information summarizes the columns that the
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\fBjstat\fR
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command outputs for each
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\fIstatOption\fR\&.
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.PP
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\-class \fIoption\fR
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.RS 4
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Class loader statistics\&.
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.sp
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\fBLoaded\fR: Number of classes loaded\&.
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.sp
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\fBBytes\fR: Number of kBs loaded\&.
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.sp
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\fBUnloaded\fR: Number of classes unloaded\&.
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.sp
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\fBBytes\fR: Number of Kbytes unloaded\&.
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.sp
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\fBTime\fR: Time spent performing class loading and unloading operations\&.
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.RE
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.PP
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\-compiler \fIoption\fR
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.RS 4
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Java HotSpot VM Just\-in\-Time compiler statistics\&.
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.sp
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\fBCompiled\fR: Number of compilation tasks performed\&.
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.sp
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\fBFailed\fR: Number of compilations tasks failed\&.
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.sp
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\fBInvalid\fR: Number of compilation tasks that were invalidated\&.
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.sp
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\fBTime\fR: Time spent performing compilation tasks\&.
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.sp
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\fBFailedType\fR: Compile type of the last failed compilation\&.
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.sp
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\fBFailedMethod\fR: Class name and method of the last failed compilation\&.
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.RE
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.PP
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\-gc \fIoption\fR
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.RS 4
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Garbage\-collected heap statistics\&.
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.sp
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\fBS0C\fR: Current survivor space 0 capacity (kB)\&.
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.sp
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\fBS1C\fR: Current survivor space 1 capacity (kB)\&.
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.sp
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\fBS0U\fR: Survivor space 0 utilization (kB)\&.
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.sp
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\fBS1U\fR: Survivor space 1 utilization (kB)\&.
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.sp
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\fBEC\fR: Current eden space capacity (kB)\&.
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.sp
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\fBEU\fR: Eden space utilization (kB)\&.
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.sp
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\fBOC\fR: Current old space capacity (kB)\&.
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.sp
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\fBOU\fR: Old space utilization (kB)\&.
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.sp
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\fBMC\fR: Metaspace capacity (kB)\&.
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.sp
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\fBMU\fR: Metacspace utilization (kB)\&.
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   379
.sp
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\fBCCSC\fR: Compressed class space capacity (kB)\&.
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.sp
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\fBCCSU\fR: Compressed class space used (kB)\&.
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   383
.sp
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\fBYGC\fR: Number of young generation garbage collection events\&.
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   385
.sp
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\fBYGCT\fR: Young generation garbage collection time\&.
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   387
.sp
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   388
\fBFGC\fR: Number of full GC events\&.
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   389
.sp
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   390
\fBFGCT\fR: Full garbage collection time\&.
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   391
.sp
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   392
\fBGCT\fR: Total garbage collection time\&.
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   393
.RE
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   394
.PP
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   395
\-gccapacity \fIoption\fR
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   396
.RS 4
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   397
Memory pool generation and space capacities\&.
31876
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   398
.sp
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   399
\fBNGCMN\fR: Minimum new generation capacity (kB)\&.
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   400
.sp
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   401
\fBNGCMX\fR: Maximum new generation capacity (kB)\&.
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   402
.sp
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   403
\fBNGC\fR: Current new generation capacity (kB)\&.
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   404
.sp
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   405
\fBS0C\fR: Current survivor space 0 capacity (kB)\&.
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   406
.sp
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   407
\fBS1C\fR: Current survivor space 1 capacity (kB)\&.
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   408
.sp
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   409
\fBEC\fR: Current eden space capacity (kB)\&.
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   410
.sp
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   411
\fBOGCMN\fR: Minimum old generation capacity (kB)\&.
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   412
.sp
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   413
\fBOGCMX\fR: Maximum old generation capacity (kB)\&.
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   414
.sp
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   415
\fBOGC\fR: Current old generation capacity (kB)\&.
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   416
.sp
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   417
\fBOC\fR: Current old space capacity (kB)\&.
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   418
.sp
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   419
\fBMCMN\fR: Minimum metaspace capacity (kB)\&.
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   420
.sp
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   421
\fBMCMX\fR: Maximum metaspace capacity (kB)\&.
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   422
.sp
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   423
\fBMC\fR: Metaspace capacity (kB)\&.
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   424
.sp
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   425
\fBCCSMN\fR: Compressed class space minimum capacity (kB)\&.
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   426
.sp
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   427
\fBCCSMX\fR: Compressed class space maximum capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   428
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   429
\fBCCSC\fR: Compressed class space capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   430
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   431
\fBYGC\fR: Number of young generation GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   432
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   433
\fBFGC\fR: Number of full GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   434
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   435
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   436
\-gccause \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   437
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   438
This option displays the same summary of garbage collection statistics as the
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   439
\fB\-gcutil\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   440
option, but includes the causes of the last garbage collection event and (when applicable) the current garbage collection event\&. In addition to the columns listed for
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   441
\fB\-gcutil\fR, this option adds the following columns\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   442
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   443
\fBLGCC\fR: Cause of last garbage collection
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   444
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   445
\fBGCC\fR: Cause of current garbage collection
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   446
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   447
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   448
\-gcnew \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   449
.RS 4
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   450
New generation statistics\&.
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   451
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   452
\fBS0C\fR: Current survivor space 0 capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   453
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   454
\fBS1C\fR: Current survivor space 1 capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   455
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   456
\fBS0U\fR: Survivor space 0 utilization (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   457
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   458
\fBS1U\fR: Survivor space 1 utilization (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   459
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   460
\fBTT\fR: Tenuring threshold\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   461
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   462
\fBMTT\fR: Maximum tenuring threshold\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   463
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   464
\fBDSS\fR: Desired survivor size (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   465
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   466
\fBEC\fR: Current eden space capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   467
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   468
\fBEU\fR: Eden space utilization (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   469
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   470
\fBYGC\fR: Number of young generation GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   471
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   472
\fBYGCT\fR: Young generation garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   473
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   474
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   475
\-gcnewcapacity \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   476
.RS 4
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   477
New generation space size statistics\&.
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   478
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   479
\fBNGCMN\fR: Minimum new generation capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   480
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   481
\fBNGCMX\fR: Maximum new generation capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   482
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   483
\fBNGC\fR: Current new generation capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   484
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   485
\fBS0CMX\fR: Maximum survivor space 0 capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   486
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   487
\fBS0C\fR: Current survivor space 0 capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   488
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   489
\fBS1CMX\fR: Maximum survivor space 1 capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   490
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   491
\fBS1C\fR: Current survivor space 1 capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   492
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   493
\fBECMX\fR: Maximum eden space capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   494
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   495
\fBEC\fR: Current eden space capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   496
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   497
\fBYGC\fR: Number of young generation GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   498
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   499
\fBFGC\fR: Number of full GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   500
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   501
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   502
\-gcold \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   503
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   504
Old generation and metaspace behavior statistics\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   505
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   506
\fBMC\fR: Metaspace capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   507
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   508
\fBMU\fR: Metaspace utilization (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   509
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   510
\fBCCSC\fR: Compressed class space capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   511
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   512
\fBCCSU\fR: Compressed class space used (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   513
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   514
\fBOC\fR: Current old space capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   515
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   516
\fBOU\fR: Old space utilization (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   517
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   518
\fBYGC\fR: Number of young generation GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   519
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   520
\fBFGC\fR: Number of full GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   521
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   522
\fBFGCT\fR: Full garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   523
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   524
\fBGCT\fR: Total garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   525
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   526
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   527
\-gcoldcapacity \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   528
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   529
Old generation size statistics\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   530
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   531
\fBOGCMN\fR: Minimum old generation capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   532
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   533
\fBOGCMX\fR: Maximum old generation capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   534
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   535
\fBOGC\fR: Current old generation capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   536
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   537
\fBOC\fR: Current old space capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   538
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   539
\fBYGC\fR: Number of young generation GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   540
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   541
\fBFGC\fR: Number of full GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   542
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   543
\fBFGCT\fR: Full garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   544
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   545
\fBGCT\fR: Total garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   546
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   547
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   548
\-gcmetacapacity \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   549
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   550
Metaspace size statistics\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   551
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   552
\fBMCMN\fR: Minimum metaspace capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   553
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   554
\fBMCMX\fR: Maximum metaspace capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   555
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   556
\fBMC\fR: Metaspace capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   557
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   558
\fBCCSMN\fR: Compressed class space minimum capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   559
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   560
\fBCCSMX\fR: Compressed class space maximum capacity (kB)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   561
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   562
\fBYGC\fR: Number of young generation GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   563
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   564
\fBFGC\fR: Number of full GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   565
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   566
\fBFGCT\fR: Full garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   567
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   568
\fBGCT\fR: Total garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   569
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   570
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   571
\-gcutil \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   572
.RS 4
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   573
Summary of garbage collection statistics\&.
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   574
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   575
\fBS0\fR: Survivor space 0 utilization as a percentage of the space\*(Aqs current capacity\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   576
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   577
\fBS1\fR: Survivor space 1 utilization as a percentage of the space\*(Aqs current capacity\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   578
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   579
\fBE\fR: Eden space utilization as a percentage of the space\*(Aqs current capacity\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   580
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   581
\fBO\fR: Old space utilization as a percentage of the space\*(Aqs current capacity\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   582
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   583
\fBM\fR: Metaspace utilization as a percentage of the space\*(Aqs current capacity\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   584
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   585
\fBCCS\fR: Compressed class space utilization as a percentage\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   586
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   587
\fBYGC\fR: Number of young generation GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   588
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   589
\fBYGCT\fR: Young generation garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   590
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   591
\fBFGC\fR: Number of full GC events\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   592
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   593
\fBFGCT\fR: Full garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   594
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   595
\fBGCT\fR: Total garbage collection time\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   596
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   597
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   598
\-printcompilation \fIoption\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   599
.RS 4
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   600
Java HotSpot VM compiler method statistics\&.
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   601
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   602
\fBCompiled\fR: Number of compilation tasks performed by the most recently compiled method\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   603
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   604
\fBSize\fR: Number of bytes of byte code of the most recently compiled method\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   605
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   606
\fBType\fR: Compilation type of the most recently compiled method\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   607
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   608
\fBMethod\fR: Class name and method name identifying the most recently compiled method\&. Class name uses slash (/) instead of dot (\&.) as a name space separator\&. Method name is the method within the specified class\&. The format for these two fields is consistent with the HotSpot
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   609
\fB\-XX:+PrintCompilation\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   610
option\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   611
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   612
.SH "EXAMPLES"
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   613
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   614
This section presents some examples of monitoring a local JVM with an
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   615
\fIlvmid\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   616
of 21891\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   617
.SS "The gcutil Option"
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   618
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   619
This example attaches to lvmid 21891 and takes 7 samples at 250 millisecond intervals and displays the output as specified by the \-\fBgcutil\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   620
option\&.
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   621
.PP
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   622
The output of this example shows that a young generation collection occurred between the third and fourth sample\&. The collection took 0\&.078 seconds and promoted objects from the eden space (E) to the old space (O), resulting in an increase of old space utilization from 66\&.80% to 68\&.19%\&. Before the collection, the survivor space was 97\&.02% utilized, but after this collection it is 91\&.03% utilized\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   623
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   624
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   625
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   626
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   627
.nf
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   628
\fBjstat \-gcutil 21891 250 7\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   629
\fB  S0     S1     E      O      M     CCS    YGC     YGCT    FGC    FGCT     GCT   \fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   630
\fB  0\&.00  97\&.02  70\&.31  66\&.80  95\&.52  89\&.14      7    0\&.300     0    0\&.000    0\&.300\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   631
\fB  0\&.00  97\&.02  86\&.23  66\&.80  95\&.52  89\&.14      7    0\&.300     0    0\&.000    0\&.300\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   632
\fB  0\&.00  97\&.02  96\&.53  66\&.80  95\&.52  89\&.14      7    0\&.300     0    0\&.000    0\&.300\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   633
\fB 91\&.03   0\&.00   1\&.98  68\&.19  95\&.89  91\&.24      8    0\&.378     0    0\&.000    0\&.378\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   634
\fB 91\&.03   0\&.00  15\&.82  68\&.19  95\&.89  91\&.24      8    0\&.378     0    0\&.000    0\&.378\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   635
\fB 91\&.03   0\&.00  17\&.80  68\&.19  95\&.89  91\&.24      8    0\&.378     0    0\&.000    0\&.378\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   636
\fB 91\&.03   0\&.00  17\&.80  68\&.19  95\&.89  91\&.24      8    0\&.378     0    0\&.000    0\&.378\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   637
.fi
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   638
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   639
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   640
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   641
.SS "Repeat the Column Header String"
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   642
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   643
This example attaches to lvmid 21891 and takes samples at 250 millisecond intervals and displays the output as specified by
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   644
\fB\-gcnew\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   645
option\&. In addition, it uses the
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   646
\fB\-h3\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   647
option to output the column header after every 3 lines of data\&.
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   648
.PP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   649
In addition to showing the repeating header string, this example shows that between the second and third samples, a young GC occurred\&. Its duration was 0\&.001 seconds\&. The collection found enough active data that the survivor space 0 utilization (S0U) would have exceeded the desired survivor Size (DSS)\&. As a result, objects were promoted to the old generation (not visible in this output), and the tenuring threshold (TT) was lowered from 31 to 2\&.
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   650
.PP
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   651
Another collection occurs between the fifth and sixth samples\&. This collection found very few survivors and returned the tenuring threshold to 31\&.
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   652
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   653
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   654
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   655
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   656
.nf
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   657
\fBjstat \-gcnew \-h3 21891 250\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   658
\fB S0C    S1C    S0U    S1U   TT MTT  DSS      EC       EU     YGC     YGCT\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   659
\fB  64\&.0   64\&.0    0\&.0   31\&.7 31  31   32\&.0    512\&.0    178\&.6    249    0\&.203\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   660
\fB  64\&.0   64\&.0    0\&.0   31\&.7 31  31   32\&.0    512\&.0    355\&.5    249    0\&.203\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   661
\fB  64\&.0   64\&.0   35\&.4    0\&.0  2  31   32\&.0    512\&.0     21\&.9    250    0\&.204\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   662
\fB S0C    S1C    S0U    S1U   TT MTT  DSS      EC       EU     YGC     YGCT\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   663
\fB  64\&.0   64\&.0   35\&.4    0\&.0  2  31   32\&.0    512\&.0    245\&.9    250    0\&.204\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   664
\fB  64\&.0   64\&.0   35\&.4    0\&.0  2  31   32\&.0    512\&.0    421\&.1    250    0\&.204\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   665
\fB  64\&.0   64\&.0    0\&.0   19\&.0 31  31   32\&.0    512\&.0     84\&.4    251    0\&.204\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   666
\fB S0C    S1C    S0U    S1U   TT MTT  DSS      EC       EU     YGC     YGCT\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   667
\fB  64\&.0   64\&.0    0\&.0   19\&.0 31  31   32\&.0    512\&.0    306\&.7    251    0\&.204\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   668
 
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   669
.fi
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   670
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   671
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   672
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   673
.SS "Include a Time Stamp for Each Sample"
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   674
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   675
This example attaches to lvmid 21891 and takes 3 samples at 250 millisecond intervals\&. The
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   676
\fB\-t\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   677
option is used to generate a time stamp for each sample in the first column\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   678
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   679
The Timestamp column reports the elapsed time in seconds since the start of the target JVM\&. In addition, the
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   680
\fB\-gcoldcapacity\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   681
output shows the old generation capacity (OGC) and the old space capacity (OC) increasing as the heap expands to meet allocation or promotion demands\&. The old generation capacity (OGC) has grown from 11,696 kB to 13,820 kB after the eighty\-first full garbage collection (FGC)\&. The maximum capacity of the generation (and space) is 60,544 kB (OGCMX), so it still has room to expand\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   682
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   683
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   684
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   685
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   686
.nf
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   687
\fBTimestamp      OGCMN    OGCMX     OGC       OC       YGC   FGC    FGCT    GCT\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   688
\fB          150\&.1   1408\&.0  60544\&.0  11696\&.0  11696\&.0   194    80    2\&.874   3\&.799\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   689
\fB          150\&.4   1408\&.0  60544\&.0  13820\&.0  13820\&.0   194    81    2\&.938   3\&.863\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   690
\fB          150\&.7   1408\&.0  60544\&.0  13820\&.0  13820\&.0   194    81    2\&.938   3\&.863\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   691
 
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   692
.fi
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   693
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   694
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   695
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   696
.SS "Monitor Instrumentation for a Remote JVM"
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   697
.PP
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   698
This example attaches to lvmid 40496 on the system named remote\&.domain using the
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   699
\fB\-gcutil\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   700
option, with samples taken every second indefinitely\&.
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   701
.PP
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   702
The lvmid is combined with the name of the remote host to construct a
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   703
\fIvmid\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   704
of
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   705
\fB40496@remote\&.domain\fR\&. This vmid results in the use of the
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   706
\fBrmi\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   707
protocol to communicate to the default
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   708
\fBjstatd\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   709
server on the remote host\&. The
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   710
\fBjstatd\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   711
server is located using the
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   712
\fBrmiregistry\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   713
command on
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   714
\fBremote\&.domain\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   715
that is bound to the default port of the
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   716
\fBrmiregistry\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   717
command (port 1099)\&.
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   718
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   719
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   720
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   721
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   722
.nf
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   723
\fBjstat \-gcutil 40496@remote\&.domain 1000\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   724
\fB\fI\&.\&.\&. output omitted\fR\fR
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   725
 
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   726
.fi
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   727
.if n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   728
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   729
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   730
.SH "SEE ALSO"
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   731
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   732
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   733
.ie n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   734
\h'-04'\(bu\h'+03'\c
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   735
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   736
.el \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   737
.sp -1
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   738
.IP \(bu 2.3
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   739
.\}
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   740
java(1)
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   741
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   742
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   743
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   744
.ie n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   745
\h'-04'\(bu\h'+03'\c
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   746
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   747
.el \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   748
.sp -1
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   749
.IP \(bu 2.3
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   750
.\}
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   751
jps(1)
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   752
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   753
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   754
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   755
.ie n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   756
\h'-04'\(bu\h'+03'\c
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   757
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   758
.el \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   759
.sp -1
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   760
.IP \(bu 2.3
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   761
.\}
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   762
jstatd(1)
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   763
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   764
.sp
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   765
.RS 4
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   766
.ie n \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   767
\h'-04'\(bu\h'+03'\c
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   768
.\}
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   769
.el \{\
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   770
.sp -1
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   771
.IP \(bu 2.3
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   772
.\}
21743
3d979da7bdf0 8029043: Update nroff files for JDK 8
rgallard
parents: 9573
diff changeset
   773
rmiregistry(1)
31876
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   774
.RE
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   775
.br
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   776
'pl 8.5i
91b22707521a 8131105: Header Template for nroff man pages *.1 files contains errors
mfang
parents: 21743
diff changeset
   777
'bp