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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1024) Define a virtual core unambigiously
Date Tue, 06 Aug 2013 00:26:49 GMT

    [ https://issues.apache.org/jira/browse/YARN-1024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13730197#comment-13730197
] 

Sandy Ryza commented on YARN-1024:
----------------------------------

bq. The speed that hardware permits a task to read from disk or over the network has can have
just as large an impact on the processing power it consumes as whatever the task is doing.
Meant: The speed that hardware permits a task to read from disk or over the network can have
just as large an impact on the processing power it consumes as whatever the task is doing.
                
> Define a virtual core unambigiously
> -----------------------------------
>
>                 Key: YARN-1024
>                 URL: https://issues.apache.org/jira/browse/YARN-1024
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>
> We need to clearly define the meaning of a virtual core unambiguously so that it's easy
to migrate applications between clusters.
> For e.g. here is Amazon EC2 definition of ECU: http://aws.amazon.com/ec2/faqs/#What_is_an_EC2_Compute_Unit_and_why_did_you_introduce_it
> Essentially we need to clearly define a YARN Virtual Core (YVC).
> Equivalently, we can use ECU itself: *One EC2 Compute Unit provides the equivalent CPU
capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor.*

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