cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (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:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-6386:
--------------------------------------

    Attachment: running-sum.txt

Patch to keep a running total of the sum needed to compute the mean.

> 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).



--
This message was sent by Atlassian JIRA
(v6.1#6144)

Mime
View raw message