On 12/06/2012 14:50, Christopher Schultz wrote: > Pid, > > On 6/12/12 5:47 AM, Pid wrote: >> On 11/06/2012 20:15, Christopher Schultz wrote: >>> Also, your previously-posted configuration seems a little >>> insane: >>> >>>> Xms6g -Xmx6g -XX:NewSize=4G -XX:MaxNewSize=4G >>>> -XX:SurvivorRatio=6 -XX:MaxPermSize=512M >>>> -XX:-UseConcMarkSweepGC -XX:+UseStringCache >>>> -XX:+HeapDumpOnOutOfMemoryError >>>> -XX:HeapDumpPath=/home/example/logs >>> >>> -Xmx6g and NewSize=4G? Plus 0.5G for PermGen? > >> I think you'll run into trouble setting the NewSize that large. >> There's a reason that the NewRatio works the way it does. > >> Sun advice always used to be "keep the eden size between 1/4th and >> 1/3rd the maximum heap size". You are specifying 2/3rd the max >> heap. > > +1 > > I don't know what happens during a collection if the survisor space is > too small for all the objects being promoted from eden... does the MM > just randomly promote objects to the old space?
I don't know either for certain, but I'd not be surprised if Bad Things Happened. I think you'd probably see a bunch of full collections in the run up to that situation & your performance would fall off a cliff. You might get an OOM before it got there, depending on the GC algo in play. p -- [key:62590808]
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