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Posted to commits@cassandra.apache.org by "Wei Deng (JIRA)" <ji...@apache.org> on 2014/12/01 07:56:14 UTC

[jira] [Commented] (CASSANDRA-8150) Revaluate Default JVM tuning parameters

    [ https://issues.apache.org/jira/browse/CASSANDRA-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14229472#comment-14229472 ] 

Wei Deng commented on CASSANDRA-8150:
-------------------------------------

Can we also test increasing InitialCodeCacheSize and ReservedCodeCacheSize to 256MB? According to this JavaOne 2013 talk from a Twitter engineer (https://oracleus.activeevents.com/2013/connect/fileDownload/session/DF4EE14FC64B279BC4C9E699C0231622/CON4540_Keenan-JavaOne2013-CON4540-Keenan.pdf, page 47), the default settings are too low.

> Revaluate Default JVM tuning parameters
> ---------------------------------------
>
>                 Key: CASSANDRA-8150
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8150
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Config
>            Reporter: Matt Stump
>            Assignee: Brandon Williams
>         Attachments: upload.png
>
>
> It's been found that the old twitter recommendations of 100m per core up to 800m is harmful and should no longer be used.
> Instead the formula used should be 1/3 or 1/4 max heap with a max of 2G. 1/3 or 1/4 is debatable and I'm open to suggestions. If I were to hazard a guess 1/3 is probably better for releases greater than 2.1.



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