Jmap: Difference between revisions
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| Line 17: | Line 17: | ||
=Capturing Permanent Generation Info= | =Capturing Permanent Generation Info= | ||
jmap -permstat JBOSS_PID > | jmap -permstat JBOSS_PID > permstat.out | ||
=When JVM is too Busy to Allow Sockets= | =When JVM is too Busy to Allow Sockets= | ||
Latest revision as of 23:57, 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 ...