[jboss-user] [Performance Tuning] - Re: JBoss 4.05 don't release free memory - Out of Memory err

[PeterJ]

I was wrong. I just talked to my JVM expert and the JVM will give memory back to the OS under certain circumstances. It will give back memory only during a garbage collection. Taking a snapshot of memory usage is not sufficient to make any conclusion about memory. If the JVM is not doing anything it will not just suddenly wake up and say "oh, I have too much memory, I think I will give some back." You need to gather garbage collection data while running the JVM and that data will indicate when, or if, the JVM is giving memory back to the OS.

Note that JBossAS has no say whatsoever in this matter.

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