Weblogic Mission Control Diagnostic Command : jrcmd

JRCMD

jrcmd is a command-line tool included with the JRockit JDK that you can use to send diagnostic commands to a running JVM process. jrcmd communicates with the JVM by using the JDK attach mechanism.

jrcmd <jrockit pid> [<command> [<arguments>]] [-l] [-f file] [-p] -h]

1. <jrockit pid>
 is either the process ID or the name of the Main class that runs the application.
2. [<command> [<arguments>]] is any diagnostic command and its associated arguments; for example, version, print_properties, command_line.
3. -l displays the counters exposed by this process.
4. -f reads and executes commands from the file.
5. -p lists JRockit JVM processes on the local machine.
6. -h displays help.

If the PID is 0, commands will be sent to all Jrockit JVM processes. 

If no options are given, the default is -p

List all JRockit JVM processes running on the machine

Run jrcmd or jrcmd -p to list the running JRockit JVMs

Example:

C:\Oracle\Middleware2\jrockit_160_24_D1.1.2-4\bin>jrcmd -p -version

5932 jrockit.tools.jrcmd.JrCmd -p -version

760 weblogic.Server

Print heap diagnostic 

./JROCKIT_HOME/bin/jrcmd PID heap_diagnostics 

Prints out a report on the JVM's native memory allocation on the C-Heap

./JROCKIT_HOME/bin/jrcmd PID heapreport 

( applicable for R27.x release only )

Prints out a comprehensive summary of garbage collection activity so far during the run

./JROCKIT_HOME/bin/jrcmd PID gcreport

( applicable for R27.x release only )

Take thread dumps

./JROCKIT_HOME/bin/jrcmd PID print_threads

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Print Memory Usage

./JROCKIT_HOME/bin/jrcmd PID print_memusage