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Date: Tue, 3 May 2011 16:15:03 +0000 (UTC)
From: "Peter Schuller (JIRA)" <jira@apache.org>
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Subject: [jira] [Assigned] (CASSANDRA-2594) run cassandra under numactl
 --interleave=all
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     [ https://issues.apache.org/jira/browse/CASSANDRA-2594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Peter Schuller reassigned CASSANDRA-2594:
-----------------------------------------

    Assignee: Peter Schuller

> run cassandra under numactl --interleave=all
> --------------------------------------------
>
>                 Key: CASSANDRA-2594
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2594
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Peter Schuller
>            Assignee: Peter Schuller
>            Priority: Minor
>         Attachments: CASSANDRA-2594-trunkk.txt
>
>
> By default, Linux attempts to be smart about memory allocations such that data is close to the NUMA node on which it runs. For big database type of applications, this is not the best thing to do if the priority is to avoid disk I/O. In particular with Cassandra, we're heavily multi-threaded anyway and there is no particular reason to believe that one NUMA node is "better" than another.
> Consequences of allocating unevenly among NUMA nodes can include excessive page cache eviction when the kernel tries to allocate memory - such as when restarting the JVM.
> With that briefly stated background, I propse the following patch to make the Cassandra script run Cassandra with numactl --interleave=all if numactl seems to be available.

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