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From "Caldarale, Charles R" <Chuck.Caldar...@unisys.com>
Subject RE: Effect of Heap Size on Performance?
Date Wed, 11 Mar 2009 00:56:54 GMT
> From: Martin Gainty [mailto:mgainty@hotmail.com] 
> Subject: RE: Effect of Heap Size on Performance?
> 
> any rules of thumb to follow for restricting heap to eden 
> (and not jumping the fence to permgen)?

I think you're confusing PermGen with the old (aka tenured) generation.  Only instances of
java.lang.Class go into PermGen (plus some internal JVM structures); nothing ever "jumps the
fence" into PermGen.

It's impossible to prevent at least some objects from eventually migrating to the OldGen,
since anything that persists long enough will end up there after some number of minor GCs.

 - Chuck


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