| rgallard | b643545 | 2013-11-25 20:19:02 -0800 | [diff] [blame^] | 1 | '\" t |
| 2 | .\" Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
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| 12 | .\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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| 13 | .\" version 2 for more details (a copy is included in the LICENSE file that
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| 21 | .\" or visit www.oracle.com if you need additional information or have any
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| 22 | .\" questions.
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| 23 | .\"
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| 24 | .\" Arch: generic |
| 25 | .\" Software: JDK 8 |
| 26 | .\" Date: 21 November 2013 |
| 27 | .\" SectDesc: Troubleshooting Tools |
| 28 | .\" Title: jcmd.1 |
| 29 | .\" |
| 30 | .if n .pl 99999 |
| 31 | .TH jcmd 1 "21 November 2013" "JDK 8" "Troubleshooting Tools" |
| 32 | .\" -----------------------------------------------------------------
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| 33 | .\" * Define some portability stuff
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| 34 | .\" -----------------------------------------------------------------
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| 35 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 36 | .\" http://bugs.debian.org/507673
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| 37 | .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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| 38 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 39 | .ie \n(.g .ds Aq \(aq
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| 40 | .el .ds Aq '
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| 41 | .\" -----------------------------------------------------------------
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| 42 | .\" * set default formatting
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| 43 | .\" -----------------------------------------------------------------
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| 44 | .\" disable hyphenation
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| 45 | .nh
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| 46 | .\" disable justification (adjust text to left margin only)
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| 47 | .ad l
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| 48 | .\" -----------------------------------------------------------------
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| 49 | .\" * MAIN CONTENT STARTS HERE *
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| 50 | .\" -----------------------------------------------------------------
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| 51 | |
| 52 | .SH NAME |
| 53 | jcmd \- Sends diagnostic command requests to a running Java Virtual Machine (JVM)\&. |
| 54 | .SH SYNOPSIS |
| 55 | .sp |
| 56 | .nf |
| 57 | |
| 58 | \fBjcmd\fR [\fB\-l\fR|\fB\-h\fR|\fB\-help\fR] |
| 59 | .fi |
| 60 | .nf |
| 61 | |
| 62 | \fBjcmd\fR \fIpid\fR|\fImain\-class\fR \fBPerfCounter\&.print\fR |
| 63 | .fi |
| 64 | .nf |
| 65 | |
| 66 | \fBjcmd\fR \fIpid\fR|\fImain\-class\fR \fB\-f\fR \fIfilename\fR |
| 67 | .fi |
| 68 | .nf |
| 69 | |
| 70 | \fBjcmd\fR \fIpid\fR|\fImain\-class\fR \fIcommand\fR[ \fIarguments\fR] |
| 71 | .fi |
| 72 | .sp |
| 73 | .SH DESCRIPTION |
| 74 | The \f3jcmd\fR utility is used to send diagnostic command requests to the JVM\&. It must be used on the same machine on which the JVM is running, and have the same effective user and group identifiers that were used to launch the JVM\&. |
| 75 | .PP |
| 76 | \fINote:\fR To invoke diagnostic commands from a remote machine or with different identiers, you can use the \f3com\&.sun\&.management\&.DiagnosticCommandMBean\fR interface\&. For more information about the \f3DiagnosticCommandMBean\fR interface, see the API documentation at http://download\&.java\&.net/jdk8/docs/jre/api/management/extension/com/sun/management/DiagnosticCommandMBean\&.html |
| 77 | .PP |
| 78 | If you run \f3jcmd\fR without arguments or with the \f3-l\fR option, it prints the list of running Java process identifiers with the main class and command-line arguments that were used to launch the process\&. Running \f3jcmd\fR with the \f3-h\fR or \f3-help\fR option prints the tool\(cqs help message\&. |
| 79 | .PP |
| 80 | If you specify the processes identifier (\fIpid\fR) or the main class (\fImain-class\fR) as the first argument, \f3jcmd\fR sends the diagnostic command request to the Java process with the specified identifier or to all Java processes with the specified name of the main class\&. You can also send the diagnostic command request to all available Java processes by specifying \f30\fR as the process identifier\&. Use one of the following as the diagnostic command request: |
| 81 | .TP |
| 82 | Perfcounter\&.print |
| 83 | Prints the performance counters available for the specified Java process\&. The list of performance counters might vary with the Java process\&. |
| 84 | .TP |
| 85 | -f \fIfilename\fR |
| 86 | .br |
| 87 | The name of the file from which to read diagnostic commands and send them to the specified Java process\&. Used only with the \f3-f\fR option\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&. |
| 88 | .TP |
| 89 | \fIcommand\fR [\fIarguments\fR] |
| 90 | The command to be sent to the specified Java process\&. The list of available diagnostic commands for a given process can be obtained by sending the \f3help\fR command to this process\&. Each diagnostic command has its own set of arguments\&. To see the description, syntax, and a list of available arguments for a command, use the name of the command as the argument for the \f3help\fR command\&. |
| 91 | |
| 92 | \fINote:\fR If any arguments contain spaces, you must surround them with single or double quotation marks (\f3\&'\fR or \f3"\fR)\&. In addition, you must escape single or double quotation marks with a backslash (\f3\e\fR) to prevent the operating system shell from processing quotation marks\&. Alternatively, you can surround these arguments with single quotation marks and then with double quotation marks (or with double quotation marks and then with single quotation marks)\&. |
| 93 | .SH OPTIONS |
| 94 | Options are mutually exclusive\&. |
| 95 | .TP |
| 96 | -f \fIfilename\fR |
| 97 | .br |
| 98 | Reads commands from the specified file\&. This option can be used only if you specify the process identifier or the main class as the first argument\&. Each command in the file must be written on a single line\&. Lines starting with a number sign (\f3#\fR) are ignored\&. Processing of the file ends when all lines have been read or when a line containing the \f3stop\fR keyword is read\&. |
| 99 | .TP |
| 100 | -h, -help |
| 101 | .br |
| 102 | Prints a help message\&. |
| 103 | .TP |
| 104 | -l |
| 105 | .br |
| 106 | Prints the list of running Java processes identifiers with the main class and command-line arguments\&. |
| 107 | .SH SEE\ ALSO |
| 108 | .TP 0.2i |
| 109 | \(bu |
| 110 | jps(1) |
| 111 | .RE
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| 112 | .br
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| 113 | 'pl 8.5i
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| 114 | 'bp
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