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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6386) FD mean calculation performance improvement
Date Wed, 20 Nov 2013 17:03:36 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13827847#comment-13827847
] 

Jonathan Ellis commented on CASSANDRA-6386:
-------------------------------------------

Note that clear() would be problematic in a concurrent scenario; fortunately clear is semantically
equivalent to remove, so I replaced the former with the latter.

> 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
>             Fix For: 2.0.3
>
>         Attachments: running-sum.txt
>
>
> 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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