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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2440) Cgroups should limit YARN containers to cores allocated in yarn-site.xml
Date Fri, 22 Aug 2014 17:08:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-2440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107093#comment-14107093
] 

Jason Lowe commented on YARN-2440:
----------------------------------

bq. does it make sense to get the number of physical cores on the machine and derive the vcore
to physical cpu ratio?

Only if the user can specify the multiplier between a vcore and a physical CPU.  Not all physical
CPUs are created equal, and as I mentioned earlier, some sites will want to allow fractions
of a physical CPU to be allocated.  Otherwise we're limiting the number of containers to the
number of physical cores, and not all tasks require a full core.

> Cgroups should limit YARN containers to cores allocated in yarn-site.xml
> ------------------------------------------------------------------------
>
>                 Key: YARN-2440
>                 URL: https://issues.apache.org/jira/browse/YARN-2440
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Varun Vasudev
>            Assignee: Varun Vasudev
>         Attachments: apache-yarn-2440.0.patch, screenshot-current-implementation.jpg
>
>
> The current cgroups implementation does not limit YARN containers to the cores allocated
in yarn-site.xml.



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