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=External= | |||
* http://download.oracle.com/javase/6/docs/technotes/tools/share/jmap.html | |||
* http://blogs.sun.com/alanb/entry/heap_dumps_are_back_with | |||
* http://jfarcand.wordpress.com/?s=jmap | |||
=Internal= | =Internal= | ||
* [[Java Heap Dump#Overview|Java Heap Dump]] | * [[Java Heap Dump#Overview|Java Heap Dump]] | ||
=Overview= | |||
jmap -dump:file=dump.bin <pid> | |||
where <pid> can be obtained with <tt>jps</tt>. | |||
=Capturing Permanent Generation Info= | |||
jmap -permstat JBOSS_PID >& permstat.out | |||
=When JVM is too Busy to Allow Sockets= | |||
Use -F: | |||
jbossusr@tcffep4r6ap26 log]$ /opt/jboss/java/jdk1.6.0_29/bin/jmap -dump:file=/opt/tmp/ap26.dump 1670 | |||
1670: Unable to open socket file: target process not responding or HotSpot VM not loaded | |||
The -F option can be used when the target process is not responding | |||
jmap -F -dump:file=/opt/tmp/ap26.dump 1670 | |||
Attaching to process ID 1670, please wait... | |||
Debugger attached successfully. | |||
Server compiler detected. | |||
JVM version is 20.4-b02 | |||
Dumping heap to /opt/tmp/ap26.dump ... | |||
Revision as of 23:56, 5 February 2018
External
- http://download.oracle.com/javase/6/docs/technotes/tools/share/jmap.html
- http://blogs.sun.com/alanb/entry/heap_dumps_are_back_with
- http://jfarcand.wordpress.com/?s=jmap
Internal
Overview
jmap -dump:file=dump.bin <pid>
where <pid> can be obtained with jps.
Capturing Permanent Generation Info
jmap -permstat JBOSS_PID >& permstat.out
When JVM is too Busy to Allow Sockets
Use -F:
jbossusr@tcffep4r6ap26 log]$ /opt/jboss/java/jdk1.6.0_29/bin/jmap -dump:file=/opt/tmp/ap26.dump 1670 1670: Unable to open socket file: target process not responding or HotSpot VM not loaded The -F option can be used when the target process is not responding
jmap -F -dump:file=/opt/tmp/ap26.dump 1670
Attaching to process ID 1670, please wait... Debugger attached successfully. Server compiler detected. JVM version is 20.4-b02 Dumping heap to /opt/tmp/ap26.dump ...