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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7154) Should set MALLOC_ARENA_MAX in hadoop-config.sh
Date Tue, 24 Jul 2012 08:00:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421253#comment-13421253

Matt Foley commented on HADOOP-7154:

changed title to reflect the change actually done in the patch.
> Should set MALLOC_ARENA_MAX in hadoop-config.sh
> -----------------------------------------------
>                 Key: HADOOP-7154
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7154
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: scripts
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>             Fix For: 1.1.0, 0.22.0
>         Attachments: hadoop-7154.txt
> New versions of glibc present in RHEL6 include a new arena allocator design. In several
clusters we've seen this new allocator cause huge amounts of virtual memory to be used, since
when multiple threads perform allocations, they each get their own memory arena. On a 64-bit
system, these arenas are 64M mappings, and the maximum number of arenas is 8 times the number
of cores. We've observed a DN process using 14GB of vmem for only 300M of resident set. This
causes all kinds of nasty issues for obvious reasons.
> Setting MALLOC_ARENA_MAX to a low number will restrict the number of memory arenas and
bound the virtual memory, with no noticeable downside in performance - we've been recommending
MALLOC_ARENA_MAX=4. We should set this in hadoop-env.sh to avoid this issue as RHEL6 becomes
more and more common.

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