[jira] Commented: (ZOOKEEPER-545) investigate use of realtime gc as the recommened default for server vm

["Jean-Daniel Cryans (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771096#action_12771096 ] 

Jean-Daniel Cryans commented on ZOOKEEPER-545:
----------------------------------------------

Patrick,

Here's the configuration we currently ship with HBase to solve most of the basic problems seen by new users: 

{noformat}
-XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode
{noformat}

Also since 1.6u14 and with 1.7 beta, Java ships with the new G1 GC (paper http://www.research.sun.com/jtech/pubs/04-g1-paper-ismm.pdf) which get rids of JVM pauses. You can use the following options to enable it:

{noformat}
-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC
{noformat}

> investigate use of realtime gc as the recommened default for server vm
> ----------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-545
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-545
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Patrick Hunt
>            Priority: Critical
>             Fix For: 3.3.0
>
>
> We currently don't recommend that ppl use the realtime gc when running the server, we probably should.
> Before we do so we need to verify that it works.
> We should make it the default for all our tests.
> concurrent vs "g2" or whatever it's called (new in 1.6_15 or something?)
> Update all scripts to specify this option
> update documentation to include this option and add section in the dev/ops docs detailing it's benefits (in particular latency effects of gc)
> Also, -server option? any benefit for us to recommend this as well?

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