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Posted to commits@cassandra.apache.org by "Quentin Conner (JIRA)" <ji...@apache.org> on 2013/11/20 17:59:35 UTC

[jira] [Commented] (CASSANDRA-6386) FD mean calculation performance improvement

    [ https://issues.apache.org/jira/browse/CASSANDRA-6386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13827839#comment-13827839 ] 

Quentin Conner commented on CASSANDRA-6386:
-------------------------------------------

break out cpu usage fix to separate ticket

> FD mean calculation performance improvement
> -------------------------------------------
>
>                 Key: CASSANDRA-6386
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6386
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Quentin Conner
>
> CPU profiling in #6127 found the o.a.c.gms.arrrivalWindow.mean() calculation taking the most cpu time during steady state gossip.
> cpu usage can be a limiting factor when starting > 500 nodes concurrently, which customers sometimes do (though we suggest starting nodes 2 or 3 minutes apart).



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