JDK7u45 Young GC pause time increasing with increasing total heap, but it is not the case with JDK6 (original) (raw)

nitin jalan nitinjalan at gmail.com
Mon Jan 20 08:29:37 UTC 2014

Hi,

I was analyzing the impact of minor GC pause time on SUN JDK6 and JDK7 for my low latency application.

I noticed that with ParallelGCThreads of 18, JDK7u45 is taking ~14-15 msec on 30GB total heap with 5 GB Young generation size as compared to ~9-10 msec on 10GB total heap with 5 GB Young generation size.

Application host machine specification: 4 x 2.00GHz Hex-Core Intel(R) Xeon(R) CPU E7540 Linux RAM 62 GB

I am using CMS collector and my settings are:

-Xloggc:GC.log -server -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xms10g -Xmx10g -XX:ReservedCodeCacheSize=512m -XX:CompileThreshold=50 -XX:MaxNewSize=5g -XX:NewSize=5g -XX:PermSize=128m -XX:MaxPermSize=128m -Dcom.sun.management.jmxremote.port=9100 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -XX:+UseConcMarkSweepGC -XX:-UseBiasedLocking -XX:-UseCounterDecay -XX:ParallelGCThreads=18 -XX:+UnlockDiagnosticVMOptions -XX:ParGCCardsPerStrideChunk=4096

i am attaching the log files with 10 GB and with 30 GB total heap.

Thanks and Regards -Nitin -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.openjdk.org/pipermail/hotspot-gc-dev/attachments/20140120/f9adaa6d/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: GC-7u45-30GB.log Type: application/octet-stream Size: 10170 bytes Desc: not available URL: <https://mail.openjdk.org/pipermail/hotspot-gc-dev/attachments/20140120/f9adaa6d/GC-7u45-30GB.log> -------------- next part -------------- A non-text attachment was scrubbed... Name: GC-7u45-10GB.log Type: application/octet-stream Size: 9673 bytes Desc: not available URL: <https://mail.openjdk.org/pipermail/hotspot-gc-dev/attachments/20140120/f9adaa6d/GC-7u45-10GB.log>

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