Sure, here it is : -Xmx49152m -Xms49152m -Xmn1024m -Xss256k -XX:MaxDirectMemorySize=1024m -XX:MaxPermSize=512m -XX:PermSize=512m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/home/work/log/hbase/ggsrv-miliao/regionserver -XX:+PrintGCApplicationStoppedTime -XX:+UseConcMarkSweepGC -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:/home/work/log/hbase/ggsrv-miliao/regionserver/regionserver_gc.log -XX:SurvivorRatio=1 -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+CMSParallelRemarkEnabled -XX:+UseNUMA -XX:+CMSClassUnloadingEnabled -XX:+PrintSafepointStatistics -XX:PrintSafepointStatisticsCount=1 -XX:+PrintHeapAtGC -XX:+PrintTenuringDistribution -XX:CMSMaxAbortablePrecleanTime=10000 -XX:MaxGCPauseMillis=2000 -XX:TargetSurvivorRatio=80 -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=100 -XX:GCLogFileSize=128m -XX:CMSWaitDuration=2000 -XX:+CMSScavengeBeforeRemark -XX:+PrintClassHistogramAfterFullGC -XX:+PrintClassHistogramBeforeFullGC -XX:+PrintPromotionFailure -XX:ConcGCThreads=8 -XX:ParallelGCThreads=8 -XX:PretenureSizeThreshold=4m -XX:+CMSConcurrentMTEnabled -XX:+ExplicitGCInvokesConcurrent
I'm not a vm developer, so it's a suboptimal setting definitely, please do not apply it into product env directly w/o any testing with your data model. Any comments are welcome:) Liang, ________________________________________ 发件人: Azury [ziqidonglai1...@126.com] 发送时间: 2012年12月11日 14:47 收件人: user@hbase.apache.org 主题: Re:Re: 答复: Multiple regionservers on a single node Can you share your GC command options here? 在 2012-12-11 06:21:08，"Adrien Mogenet" <adrien.moge...@gmail.com> 写道： >On Fri, Dec 7, 2012 at 10:58 AM, 谢良 <xieli...@xiaomi.com> wrote: > >> Emm, have you tried to tune your GC deeply? please provide the exactly VM >> options and jdk version and GC logs.. >> In our test cluster this week, i managed to reduce the longest STW from >> 22+ seconds(Xmx20G) to 1.1s(Xmx48G) under a very heavy YCSB stress >> long-term-testing. >> > >Do you have any further explanation on your specific case ? Looks >interesting :-) > > >> >> Also it would be better to ask help from hotspot-gc-use/hotspot-gc-dev >> mail list:) >> And the G1GC within jdk7u4+ is a potential solution for large-heap senario >> as well:) >> ________________________________________ >> > On Mon, Dec 3, 2012 at 3:39 PM, Ishan Chhabra <ichha...@rocketfuel.com >> > >wrote: >> > >> > > Hi, >> > > Has anybody tried to run multiple RegionServers on a single physical >> > > node? Are there deep technical issues or minor impediments that would >> > > hinder this? >> > > >> > > We are trying to do this because we are facing a lot of GC pauses on >> the >> > > large heap sizes (~70G) that we are using, which leads to a lot of >> > timeouts >> > > in our latency critical application. More processes with smaller heaps >> > > would help in mitigating this issue. >> > > >> > > Any experience or thoughts on this would help. >> > > Thanks! >> > > >> > > -- >> > > *Ishan Chhabra *| Rocket Scientist | Rocketfuel Inc. | *m *650 556 >> 6803 >> > > >> > >> > >> > >> > -- >> > >> > Robert Dyer >> > rd...@iastate.edu >> > >> > > > >-- >Adrien Mogenet >06.59.16.64.22 >http://www.mogenet.me
