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https://issues.apache.org/jira/browse/YARN-1297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14101836#comment-14101836
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Karthik Kambatla commented on YARN-1297:
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I can take a look at an updated patch. 

> Miscellaneous Fair Scheduler speedups
> -------------------------------------
>
>                 Key: YARN-1297
>                 URL: https://issues.apache.org/jira/browse/YARN-1297
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: scheduler
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: YARN-1297-1.patch, YARN-1297-2.patch, YARN-1297.patch, 
> YARN-1297.patch
>
>
> I ran the Fair Scheduler's core scheduling loop through a profiler tool and 
> identified a bunch of minimally invasive changes that can shave off a few 
> milliseconds.
> The main one is demoting a couple INFO log messages to DEBUG, which brought 
> my benchmark down from 16000 ms to 6000.
> A few others (which had way less of an impact) were
> * Most of the time in comparisons was being spent in Math.signum.  I switched 
> this to direct ifs and elses and it halved the percent of time spent in 
> comparisons.
> * I removed some unnecessary instantiations of Resource objects
> * I made it so that queues' usage wasn't calculated from the applications up 
> each time getResourceUsage was called.



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