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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5551) Ignore deleted file mapping from memory computation when smaps is enabled
Date Thu, 25 Aug 2016 15:42:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437095#comment-15437095
] 

Chris Nauroth commented on YARN-5551:
-------------------------------------

My understanding agrees with Jason's last comment.  The mapping could last well past the deletion
of the underlying file, maybe even for the whole lifetime of the process, so it's correct
to include it in the accounting.

> Ignore deleted file mapping from memory computation when smaps is enabled
> -------------------------------------------------------------------------
>
>                 Key: YARN-5551
>                 URL: https://issues.apache.org/jira/browse/YARN-5551
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Minor
>         Attachments: YARN-5551.branch-2.001.patch
>
>
> Currently deleted file mappings are also included in the memory computation when SMAP
is enabled. For e.g
> {noformat}
> 7f612004a000-7f612004c000 rw-s 00000000 00:10 4201507513                 /dev/shm/HadoopShortCircuitShm_DFSClient_NONMAPREDUCE_-521969216_162_734673185
(deleted)
> Size:                  8 kB
> Rss:                   4 kB
> Pss:                   2 kB
> Shared_Clean:          0 kB
> Shared_Dirty:          4 kB
> Private_Clean:         0 kB
> Private_Dirty:         0 kB
> Referenced:            4 kB
> Anonymous:             0 kB
> AnonHugePages:         0 kB
> Swap:                  0 kB
> KernelPageSize:        4 kB
> MMUPageSize:           4 kB
> 7f6123f99000-7f6163f99000 rw-p 00000000 08:41 211419477                  /grid/4/hadoop/yarn/local/usercache/root/appcache/application_1466700718395_1249/container_e19_1466700718395_1249_01_000003/7389389356021597290.cache
(deleted)
> Size:            1048576 kB
> Rss:              637292 kB
> Pss:              637292 kB
> Shared_Clean:          0 kB
> Shared_Dirty:          0 kB
> Private_Clean:         0 kB
> Private_Dirty:    637292 kB
> Referenced:       637292 kB
> Anonymous:        637292 kB
> AnonHugePages:         0 kB
> Swap:                  0 kB
> KernelPageSize:        4 kB
> {noformat}
> It would be good to exclude these from getSmapBasedRssMemorySize() computation.  



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