325N/A." Copyright (c) 2004, 2011, Oracle
and/or its affiliates. All rights reserved.
325N/A." DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
325N/A." This code is free software; you can redistribute it
and/or modify it
325N/A." under the terms of the GNU General Public License version 2 only, as
325N/A." published by the Free Software Foundation.
325N/A." This code is distributed in the hope that it will be useful, but WITHOUT
325N/A." ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
325N/A." FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
325N/A." version 2 for more details (a copy is included in the LICENSE file that
325N/A." accompanied this code).
325N/A." You should have received a copy of the GNU General Public License version
325N/A." 2 along with this work; if not, write to the Free Software Foundation,
325N/A." Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
325N/A." Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
325N/A.TH jstat 1 "16 Mar 2012"
325N/Ajstat \- Java Virtual Machine Statistics Monitoring Tool
325N/A\fP\f3jstat\fP [ \f2generalOption\fP | \f2outputOptions\fP \f2vmid\fP [\f2interval\fP[s|ms] [\f2count\fP]] ]
325N/AA single general command\-line option (\-help, \-options, or \-version)
325N/AOne or more output options, consisting of a single \f2statOption\fP, plus any of the \-t, \-h, and \-J options.
325N/AVirtual machine identifier, a string indicating the target Java virtual machine (JVM). The general syntax is
325N/A[\fP\f4protocol\fP\f3:][//]\fP\f4lvmid\fP[@\f2hostname\fP[:\f2port\fP]/\f2servername\fP]
325N/AThe syntax of the vmid string largely corresponds to the syntax of a URI. The \f2vmid\fP can vary from a simple integer representing a local JVM to a more complex construction specifying a communications protocol, port number, and other implementation\-specific values. See Virtual Machine Identifier for details.
325N/ASampling interval in the specified units, seconds (s) or milliseconds (ms). Default units are milliseconds. Must be a positive integer. If specified, \f3jstat\fP will produce its output at each interval.
325N/ANumber of samples to display. Default value is infinity; that is, \f3jstat\fP displays statistics until the target JVM terminates or the \f3jstat\fP command is terminated. Must be a positive integer.
The \f3jstat\fP tool displays performance statistics for an instrumented HotSpot Java virtual machine (JVM). The target JVM is identified by its virtual machine identifier, or \f2vmid\fP option described below.
\f3NOTE\fP: This utility is unsupported and may not be available in future versions of the JDK. It is not currently available on Windows 98 and Windows ME. platforms.
VIRTUAL MACHINE IDENTIFIER
The syntax of the \f2vmid\fP string largely corresponds to the syntax of a URI:
[\fP\f4protocol\fP\f3:][//]\fP\f4lvmid\fP[@\f2hostname\fP][:\f2port\fP][/\f2servername\fP]
The communications protocol. If the \f2protocol\fP is omitted and a \f2hostname\fP is not specified, the default protocol is a platform specific optimized local protocol. If the \f2protocol\fP is omitted and a \f2hostname\fP is specified, then the default protocol is \f3rmi\fP.
The local virtual machine identifier for the target JVM. The \f2lvmid\fP is a platform\-specific value that uniquely identifies a JVM on a system. The \f2lvmid\fP is the only required component of a virtual machine identifier. The \f2lvmid\fP is typically, but not necessarily, the operating system's process identifier for the target JVM process. You can use the jps(1) command to determine the \f2lvmid\fP. Also, you can determine \f2lvmid\fP on Unix platforms with the \f3ps\fP command, and on Windows with the Windows Task Manager.
A hostname or IP address indicating the target host. If \f2hostname\fP is omitted, then the target host is the local host.
The default port for communicating with the remote server. If the \f2hostname\fP is omitted or the \f2protocol\fP specifies an optimized, local protocol, then \f2port\fP is ignored. Otherwise, treatment of the \f2port\fP parameter is implementation specific. For the default \f3rmi\fP protocol, the \f2port\fP indicates the port number for the rmiregistry on the remote host. If \f2port\fP is omitted, and \f2protocol\fP indicates \f3rmi\fP, then the default rmiregistry port (1099) is used.
The treatment of this parameter depends on implementation. For the optimized local protocol, this field is ignored. For the \f3rmi\fP protocol, it represents the name of the RMI remote object on the remote host.
The \f3jstat\fP command supports two types of options, general options and output options. General options cause \f3jstat\fP to display simple usage and version information. Output options determine the content and format of the statistical output.
\f3NOTE\fP: All options, and their functionality are subject to change or removal in future releases.
If you specify one of the general options, you cannot specify any other option or parameter.
Display version information.
Display list of statistics options. See the Output Options section below.
If you do not specify a general option, then you can specify output options. Output options determine the content and format of \f3jstat\fP's output, and consist of a single \f2statOption\fP, plus any of the other output options (\-h, \-t, and \-J). The \f2statOption\fP must come first.
Output is formatted as a table, with columns are separated by spaces. A header row with titles describes the columns. Use the \f3\-h\fP option to set the frequency at which the header is displayed. Column header names are generally consistent between the different options. In general, if two options provide a column with the same name, then the data source for the two columns are the same.
Use the \f3\-t\fP option to display a time stamp column, labeled \f2Timestamp\fP as the first column of output. The \f2Timestamp\fP column contains the elapsed time, in seconds, since startup of the target JVM. 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.
Use the \f2interval\fP and \f2count\fP parameters to determine how frequently and how many times, respectively, \f3jstat\fP displays its output.
\f3NOTE\fP: You are advised not to write scripts to parse \f3jstat's\fP output since the format may change in future releases. If you choose to write scripts that parse \f3jstat\fP output, expect to modify them for future releases of this tool.
Determines the statistics information that \f3jstat\fP displays. The following table lists the available options. Use the \f3\-options\fP general option to display the list of options for a particular platform installation.
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Statistics on the behavior of the class loader.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the behavior of the HotSpot Just\-in\-Time compiler.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the behavior of the garbage collected heap.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the capacities of the generations and their corresponding spaces.
.if \n(.l<\n(81 .ll \n(81u
Summary of garbage collection statistics (same as \f3\-gcutil\fP), with the cause of the last and current (if applicable) garbage collection events.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the behavior of the new generation.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the sizes of the new generations and its corresponding spaces.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the behavior of the old and permanent generations.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the sizes of the old generation.
.if \n(.l<\n(81 .ll \n(81u
Statistics of the sizes of the permanent generation.
.if \n(.l<\n(81 .ll \n(81u
Summary of garbage collection statistics.
.if \n(.l<\n(81 .ll \n(81u
HotSpot compilation method statistics.
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \wprintcompilation
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Displays...\fP
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 215 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'\f3Option\fP\h'|\n(41u'\f3Displays...\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'class\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'compiler\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gc\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gccapacity\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gccause\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gcnew\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gcnewcapacity\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(h|+\n(#^-1v)>\n(#- .nr #- +(\n(h|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gcold\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(i|+\n(#^-1v)>\n(#- .nr #- +(\n(i|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gcoldcapacity\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(j|+\n(#^-1v)>\n(#- .nr #- +(\n(j|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gcpermcapacity\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(k|+\n(#^-1v)>\n(#- .nr #- +(\n(k|+\n(#^-\n(#--1v)
\&\h'|\n(40u'gcutil\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(l|+\n(#^-1v)>\n(#- .nr #- +(\n(l|+\n(#^-\n(#--1v)
\&\h'|\n(40u'printcompilation\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-52
Display a column header every \f2n\fP samples (output rows), where \f2n\fP is a positive integer. Default value is 0, which displays the column header above the first row of data.
Display a timestamp column as the first column of output. The timestamp is the time since the start time of the target JVM.
Pass \f2javaOption\fP to the \f3java\fP application launcher. For example, \f3\-J\-Xms48m\fP sets the startup memory to 48 megabytes. For a complete list of options, see java(1)
The following tables summarize the columns that \f3jstat\fP outputs for each \f2statOption\fP.
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Number of classes unloaded.
.if \n(.l<\n(81 .ll \n(81u
Number of Kbytes unloaded.
.if \n(.l<\n(81 .ll \n(81u
Time spent performing class load and unload operations.
.nr 38 \wClass Loader Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of classes loaded.
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of Kbytes loaded.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 261 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Class Loader Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
\&\h'|\n(40u'Loaded\h'|\n(41u'Number of classes loaded.
\&\h'|\n(40u'Bytes\h'|\n(41u'Number of Kbytes loaded.
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Unloaded\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Bytes\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Time\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-21
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Number of compilation tasks performed.
.if \n(.l<\n(81 .ll \n(81u
Number of compilation tasks that failed.
.if \n(.l<\n(81 .ll \n(81u
Number of compilation tasks that were invalidated.
.if \n(.l<\n(81 .ll \n(81u
Time spent performing compilation tasks.
.if \n(.l<\n(81 .ll \n(81u
Compile type of the last failed compilation.
.if \n(.l<\n(81 .ll \n(81u
Class name and method for the last failed compilation.
.nr 38 \wHotSpot Just\-In\-Time Compiler Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 297 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'HotSpot Just\-In\-Time Compiler Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Compiled\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Failed\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Invalid\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Time\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'FailedType\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'FailedMethod\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-29
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 0 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 1 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Survivor space 0 utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Survivor space 1 utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Current eden space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Eden space utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Current old space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Old space utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Current permanent space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Permanent space utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Number of young generation GC Events.
.if \n(.l<\n(81 .ll \n(81u
Young generation garbage collection time.
.if \n(.l<\n(81 .ll \n(81u
Full garbage collection time.
.if \n(.l<\n(81 .ll \n(81u
Total garbage collection time.
.nr 38 \wGarbage\-collected heap statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of full GC events.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 367 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Garbage\-collected heap statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0U\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1U\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'EC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'EU\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(h|+\n(#^-1v)>\n(#- .nr #- +(\n(h|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OU\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(i|+\n(#^-1v)>\n(#- .nr #- +(\n(i|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(j|+\n(#^-1v)>\n(#- .nr #- +(\n(j|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PU\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(k|+\n(#^-1v)>\n(#- .nr #- +(\n(k|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(l|+\n(#^-1v)>\n(#- .nr #- +(\n(l|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'FGC\h'|\n(41u'Number of full GC events.
.if (\n(m|+\n(#^-1v)>\n(#- .nr #- +(\n(m|+\n(#^-\n(#--1v)
\&\h'|\n(40u'FGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(n|+\n(#^-1v)>\n(#- .nr #- +(\n(n|+\n(#^-\n(#--1v)
\&\h'|\n(40u'GCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-63
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Minimum new generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum new generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current new generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 0 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 1 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current eden space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Minimum old generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum old generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current old generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current old space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Minimum permanent generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum Permanent generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current Permanent generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current Permanent space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Number of Young generation GC Events.
.nr 38 \wMemory Pool Generation and Space Capacities
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of Full GC Events.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 441 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Memory Pool Generation and Space Capacities\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'NGCMN\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'NGCMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'NGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'EC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OGCMN\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(h|+\n(#^-1v)>\n(#- .nr #- +(\n(h|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OGCMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(i|+\n(#^-1v)>\n(#- .nr #- +(\n(i|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(j|+\n(#^-1v)>\n(#- .nr #- +(\n(j|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(k|+\n(#^-1v)>\n(#- .nr #- +(\n(k|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PGCMN\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(l|+\n(#^-1v)>\n(#- .nr #- +(\n(l|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PGCMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(m|+\n(#^-1v)>\n(#- .nr #- +(\n(m|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(n|+\n(#^-1v)>\n(#- .nr #- +(\n(n|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(o|+\n(#^-1v)>\n(#- .nr #- +(\n(o|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'FGC\h'|\n(41u'Number of Full GC Events.
.if \n-(b.=0 .nr c. \n(.c-\n(d.-67
This option displays the same summary of garbage collection statistics as the \f3\-gcutil\fP option, but includes the causes of the last garbage collection event and (if applicable) the current garbage collection event. In addition to the columns listed for \f3\-gcutil\fP, this option adds the following columns:
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Cause of last Garbage Collection.
.if \n(.l<\n(81 .ll \n(81u
Cause of current Garbage Collection.
.nr 38 \wGarbage Collection Statistics, Including GC Events
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 464 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Garbage Collection Statistics, Including GC Events\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'LGCC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'GCC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-13
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 0 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 1 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Survivor space 0 utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Survivor space 1 utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum tenuring threshold.
.if \n(.l<\n(81 .ll \n(81u
Desired survivor size (KB).
.if \n(.l<\n(81 .ll \n(81u
Current eden space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Eden space utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Number of young generation GC events.
.if \n(.l<\n(81 .ll \n(81u
Young generation garbage collection time.
.nr 38 \wNew Generation Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wTenuring threshold.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 518 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'New Generation Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0U\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1U\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'TT\h'|\n(41u'Tenuring threshold.
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'MTT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'DSS\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'EC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(h|+\n(#^-1v)>\n(#- .nr #- +(\n(h|+\n(#^-\n(#--1v)
\&\h'|\n(40u'EU\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(i|+\n(#^-1v)>\n(#- .nr #- +(\n(i|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(j|+\n(#^-1v)>\n(#- .nr #- +(\n(j|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-47
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Minimum new generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum new generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current new generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum survivor space 0 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 0 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum survivor space 1 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current survivor space 1 capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum eden space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current eden space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Number of young generation GC events.
.nr 38 \wNew Generation Space Size Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of Full GC Events.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 572 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'New Generation Space Size Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'NGCMN\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'NGCMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'NGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0CMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1CMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1C\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(h|+\n(#^-1v)>\n(#- .nr #- +(\n(h|+\n(#^-\n(#--1v)
\&\h'|\n(40u'ECMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(i|+\n(#^-1v)>\n(#- .nr #- +(\n(i|+\n(#^-\n(#--1v)
\&\h'|\n(40u'EC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(j|+\n(#^-1v)>\n(#- .nr #- +(\n(j|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'FGC\h'|\n(41u'Number of Full GC Events.
.if \n-(b.=0 .nr c. \n(.c-\n(d.-47
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Current permanent space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Permanent space utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Current old space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
old space utilization (KB).
.if \n(.l<\n(81 .ll \n(81u
Number of young generation GC events.
.if \n(.l<\n(81 .ll \n(81u
Full garbage collection time.
.if \n(.l<\n(81 .ll \n(81u
Total garbage collection time.
.nr 38 \wOld and Permanent Generation Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of full GC events.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 614 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Old and Permanent Generation Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PU\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OU\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'FGC\h'|\n(41u'Number of full GC events.
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'FGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'GCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-35
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Minimum old generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum old generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current old generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current old space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Number of young generation GC events.
.if \n(.l<\n(81 .ll \n(81u
Full garbage collection time.
.if \n(.l<\n(81 .ll \n(81u
Total garbage collection time.
.nr 38 \wOld Generation Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of full GC events.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 656 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Old Generation Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OGCMN\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OGCMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'OC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'FGC\h'|\n(41u'Number of full GC events.
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'FGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'GCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-35
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Minimum permanent generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Maximum permanent generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current permanent generation capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Current permanent space capacity (KB).
.if \n(.l<\n(81 .ll \n(81u
Number of young generation GC events.
.if \n(.l<\n(81 .ll \n(81u
Full garbage collection time.
.if \n(.l<\n(81 .ll \n(81u
Total garbage collection time.
.nr 38 \wPermanent Generation Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of full GC events.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 698 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Permanent Generation Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PGCMN\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PGCMX\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'PC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'FGC\h'|\n(41u'Number of full GC events.
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'FGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'GCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-35
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Survivor space 0 utilization as a percentage of the space's current capacity.
.if \n(.l<\n(81 .ll \n(81u
Survivor space 1 utilization as a percentage of the space's current capacity.
.if \n(.l<\n(81 .ll \n(81u
Eden space utilization as a percentage of the space's current capacity.
.if \n(.l<\n(81 .ll \n(81u
Old space utilization as a percentage of the space's current capacity.
.if \n(.l<\n(81 .ll \n(81u
Permanent space utilization as a percentage of the space's current capacity.
.if \n(.l<\n(81 .ll \n(81u
Number of young generation GC events.
.if \n(.l<\n(81 .ll \n(81u
Young generation garbage collection time.
.if \n(.l<\n(81 .ll \n(81u
Full garbage collection time.
.if \n(.l<\n(81 .ll \n(81u
Total garbage collection time.
.nr 38 \wSummary of Garbage Collection Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wNumber of full GC events.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 748 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'Summary of Garbage Collection Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S0\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'S1\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'E\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(d|+\n(#^-1v)>\n(#- .nr #- +(\n(d|+\n(#^-\n(#--1v)
\&\h'|\n(40u'O\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(e|+\n(#^-1v)>\n(#- .nr #- +(\n(e|+\n(#^-\n(#--1v)
\&\h'|\n(40u'P\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(f|+\n(#^-1v)>\n(#- .nr #- +(\n(f|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGC\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(g|+\n(#^-1v)>\n(#- .nr #- +(\n(g|+\n(#^-\n(#--1v)
\&\h'|\n(40u'YGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'FGC\h'|\n(41u'Number of full GC events.
.if (\n(h|+\n(#^-1v)>\n(#- .nr #- +(\n(h|+\n(#^-\n(#--1v)
\&\h'|\n(40u'FGCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(i|+\n(#^-1v)>\n(#- .nr #- +(\n(i|+\n(#^-\n(#--1v)
\&\h'|\n(40u'GCT\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-43
\-printcompilation Option
.if \n+(b.=1 .nr d. \n(.c-\n(c.-1
.if \(ts\n(.z\(ts\(ts .ds #d nl
.if \n(.l<\n(81 .ll \n(81u
Number of compilation tasks performed.
.if \n(.l<\n(81 .ll \n(81u
Number of bytes of bytecode for the method.
.if \n(.l<\n(81 .ll \n(81u
Class name and method name identifying the compiled method. Class name uses "/" instead of "." as namespace separator. Method name is the method within the given class. The format for these two fields is consistent with the HotSpot \- \f3XX:+PrintComplation\fP option.
.nr 38 \wHotSpot Compiler Method Statistics
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.if \n(80<\n(38 .nr 80 \n(38
.nr 38 \w\f3Description\fP
.if \n(81<\n(38 .nr 81 \n(38
.nr 38 \wCompilation type.
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if \n(81<\n(38 .nr 81 \n(38
.if t .if \n(TW>\n(.li .tm Table at line 774 file Input is too wide - \n(TW units
.if \(ts\n(.z\(ts\(ts .ds #d nl
\&\h'|\n(40u'HotSpot Compiler Method Statistics\h'|\n(41u'
\&\h'|\n(40u'\f3Column\fP\h'|\n(41u'\f3Description\fP
.if (\n(a|+\n(#^-1v)>\n(#- .nr #- +(\n(a|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Compiled\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if (\n(b|+\n(#^-1v)>\n(#- .nr #- +(\n(b|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Size\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
\&\h'|\n(40u'Type\h'|\n(41u'Compilation type.
.if (\n(c|+\n(#^-1v)>\n(#- .nr #- +(\n(c|+\n(#^-\n(#--1v)
\&\h'|\n(40u'Method\h'|\n(41u'
.if \n(32>\n(31 .nr 31 \n(32
.if \n-(b.=0 .nr c. \n(.c-\n(d.-19
This section presents some examples of monitoring a local JVM with a \f2lvmid\fP of 21891.
This example attaches to \f2lvmid\fP 21891 and takes 7 samples at 250 millisecond intervals and displays the output as specified by the \f3\-gcutil\fP option.
\fP\f3jstat \-gcutil 21891 250 7\fP
S0 S1 E O P YGC YGCT FGC FGCT GCT
12.44 0.00 27.20 9.49 96.70 78 0.176 5 0.495 0.672
12.44 0.00 62.16 9.49 96.70 78 0.176 5 0.495 0.672
12.44 0.00 83.97 9.49 96.70 78 0.176 5 0.495 0.672
0.00 7.74 0.00 9.51 96.70 79 0.177 5 0.495 0.673
0.00 7.74 23.37 9.51 96.70 79 0.177 5 0.495 0.673
0.00 7.74 43.82 9.51 96.70 79 0.177 5 0.495 0.673
0.00 7.74 58.11 9.51 96.71 79 0.177 5 0.495 0.673
The output of this example shows that a young generation collection occurred between the 3rd and 4th sample. The collection took 0.001 seconds and promoted objects from the eden space (E) to the old space (O), resulting in an increase of old space utilization from 9.49% to 9.51%. Before the collection, the survivor space was 12.44% utilized, but after this collection it is only 7.74% utilized.
Repeating the column header string
This example attaches to \f2lvmid\fP 21891 and takes samples at 250 millisecond intervals and displays the output as specified by \f3\-gcutil\fP option. In addition, it uses the \f3\-h3\fP option to output the column header after every 3 lines of data.
\fP\f3jstat \-gcnew \-h3 21891 250\fP
S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT
64.0 64.0 0.0 31.7 31 31 32.0 512.0 178.6 249 0.203
64.0 64.0 0.0 31.7 31 31 32.0 512.0 355.5 249 0.203
64.0 64.0 35.4 0.0 2 31 32.0 512.0 21.9 250 0.204
S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT
64.0 64.0 35.4 0.0 2 31 32.0 512.0 245.9 250 0.204
64.0 64.0 35.4 0.0 2 31 32.0 512.0 421.1 250 0.204
64.0 64.0 0.0 19.0 31 31 32.0 512.0 84.4 251 0.204
S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT
64.0 64.0 0.0 19.0 31 31 32.0 512.0 306.7 251 0.204
In addition to showing the repeating header string, this example shows that between the 2nd and 3rd samples, a young GC occurred. Its duration was 0.001 seconds. The collection found enough live data that the survivor space 0 utilization (S0U) would 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.
Another collection occurs between the 5th and 6th samples. This collection found very few survivors and returned the tenuring threshold to 31.
Including a time stamp for each sample
This example attaches to \f2lvmid\fP 21891 and takes 3 samples at 250 millisecond intervals. The \f3\-t\fP option is used to generate a time stamp for each sample in the first column.
\fP\f3jstat \-gcoldcapacity \-t 21891 250 3\fP
Timestamp OGCMN OGCMX OGC OC YGC FGC FGCT GCT
150.1 1408.0 60544.0 11696.0 11696.0 194 80 2.874 3.799
150.4 1408.0 60544.0 13820.0 13820.0 194 81 2.938 3.863
150.7 1408.0 60544.0 13820.0 13820.0 194 81 2.938 3.863
The \f2Timestamp\fP column reports the elapsed time in seconds since the start of the target JVM. In addition, the \f3\-gcoldcapacity\fP output shows the old generation capacity (OGC) and the old space capacity (OC) increasing as the heap expands to meet allocation
and/or promotion demands. The old generation capacity (OGC) has grown to from 11696 KB to 13820 KB after the 81st Full GC (FGC). The maximum capacity of the generation (and space) is 60544 KB (OGCMX), so it still has room to expand.
Monitor instrumentation for a remote JVM
This example attaches to \f2lvmid\fP 40496 on the system named \
f2remote.domain\fP using the \f3\-gcutil\fP option, with samples taken every second indefinitely.
\fP\f3jstat \-gcutil 40496@remote.domain 1000\fP
The \f2lvmid\fP is combined with the name of the remote host to construct a \f2vmid\fP of \f240496@remote.domain\fP. This \f2vmid\fP results in the use of the \f3rmi\fP protocol to communicate to the default \f3jstatd\fP server on the remote host. The \f3jstatd\fP server is located using the \f3rmiregistry\fP on \
f2remote.domain\fP that is bound to the default \f3rmiregistry\fP port (port 1099).
java(1) \- the Java Application Launcher
jps(1) \- the Java Process Status Application
jstatd(1) \- the jvmstat daemon
rmiregistry(1) \- the Java Remote Object Registry