G1GC heap Adaptation, Long Pauses and review request

Kirk Pepperdine kirk at kodewerk.com
Tue Jan 6 07:16:18 UTC 2015


Hi Shyam,

You’ve already asked this question on my “friends of jClarity” list and I think you’ve gotten some excellent advice there from Charlie, Gil and a few others who are well regarded experts on this subject. I’d start with that advice first.

Kind regards,
Kirk Pepperdine

On Jan 5, 2015, at 11:19 AM, megha shyam Jakkireddy <shyam21 at gmail.com> wrote:

> Hi
>  
> Recently we have done some G1 Tuning. I've added a logfile. Could somebody explain and let me know your thoughts to make it optimal. There were no full GC's observed, Heap adaptation looks good and however there were long pause times at the initial hours. And there were premature promotions as well
> 
> Additional to the logging, we are using the below G1 parameters..
> 
> -d64 -server -Xms6g -Xmx6g -XX:PermSize=2g -XX:MaxPermSize=2g -XX:+HeapDumpOnOutOfMemoryError  -XX+DisableExplicitGC -XX:+UseG1GC -XX:MaxGCPauseMillis=2000 -XX:InitiatingHeapOccupancyPercent=70 -XX:ConcGCThreads=12 -XX:G1ReservePercent=15 -XX:1HeapRegionSize=32m -XX:-UseBiasedLocking -XX:LargePageSizeInBytes=256m -XX:-UseThreadPriorities -XX:ParallelGCThreads=12 -XX:SoftRefLRUPolicyMSPerMB=1 -XX:+ParallelRefProcEnabled "
> 
> We are using JDK 1.7.0_45.
> 
> Regards
> 
>  
> <G1GC.TXT>

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