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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3612) Resource calculation in child tasks is CPU-heavy
Date Sun, 10 May 2015 14:54:01 GMT

    [ https://issues.apache.org/jira/browse/YARN-3612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537210#comment-14537210
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Varun Saxena commented on YARN-3612:
------------------------------------

Moreover, I have not added the config as I do not see anyone disabling it. Thoughts ?

> Resource calculation in child tasks is CPU-heavy
> ------------------------------------------------
>
>                 Key: YARN-3612
>                 URL: https://issues.apache.org/jira/browse/YARN-3612
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Todd Lipcon
>            Assignee: Varun Saxena
>              Labels: BB2015-05-TBR
>         Attachments: MAPREDUCE-4469.patch, MAPREDUCE-4469_rev2.patch, MAPREDUCE-4469_rev3.patch,
MAPREDUCE-4469_rev4.patch, MAPREDUCE-4469_rev5.patch
>
>
> In doing some benchmarking on a hadoop-1 derived codebase, I noticed that each of the
child tasks was doing a ton of syscalls. Upon stracing, I noticed that it's spending a lot
of time looping through all the files in /proc to calculate resource usage.
> As a test, I added a flag to disable use of the ResourceCalculatorPlugin within the tasks.
On a CPU-bound 500G-sort workload, this improved total job runtime by about 10% (map slot-seconds
by 14%, reduce slot seconds by 8%)



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