[rules-users] PermGen space error

[Geoffrey De Smet]

Hi Joe,

Thanks for correcting me.
This image indeed proves your point:
   http://java.sun.com/docs/hotspot/gc5.0/fig4.gif
As well as this thread:
   
http://www.velocityreviews.com/forums/t683307-question-on-xms-xmx-and-xx-maxpermsize-in-jvm-start-parameter.html

Very interesting, I had it wrong for years.

Op 09-02-12 13:27, Joe Ammann schreef:
> On 02/09/2012 09:34 AM, Geoffrey De Smet wrote:
>> The perm gen space is a subset of the heap space.
>> So it doesn't make sense to put them on the same value.
>>
>> Try this instead:
>>      -Xmx1024m -XX:MaxPermSize=512m
>> Or, if that fails:
>>      -Xmx2048m -XX:MaxPermSize=1024m
>>
> Sorry to disagree Geoffrey, but PermGen is NOT a part of heap in all 
> (Sun) JVM's that I'm aware of. See
>
> http://stackoverflow.com/questions/2129044/java-heap-terminology-young-old-and-permanent-generations
> http://www.oracle.com/technetwork/java/gc-tuning-5-138395.html (the 
> picture a few pages down)
>
> So the sizes are specified separately. But having a MaxPerm of 1G and 
> STILL see PermGen OOM is strange.
>
> The problem could be, that when using the CMS (concurrent mark sweep) 
> GC, PermGen is not collected. I have seen cases where sooner or later 
> OOM PermGen errors happened consistently, until we added
>
> |-XX:+CMSPermGenSweepingEnabled|
> -- 
> CU, Joe
>
>
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-- 
With kind regards,
Geoffrey De Smet

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