[jboss-user] [Performance Tuning] - Re: Full GC not releasing Memory

[smarlow@redhat.com]

Be sure that you aren't using the jmap tool from an JDK 1.6 installation (unlikely but thought it was worth mentioning).

http://www.j2ee.me/javase/6/webnotes/trouble/other/matrix5-Unix.htm talks about Java SE 5.0 update 14 supporting -XX:+HeapDumpOnCtrlBreak option.  I haven't tried this but maybe you could try this (with update 14 or newer).  Perhaps the jmap tool will even behave better.

I also like to use XX:+HeapDumpOnOutOfMemoryError (generates a heapdump file on first Java OOM) which was added in Java 5 update 7.



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