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https://issues.apache.org/jira/browse/YARN-3612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537309#comment-14537309
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Hadoop QA commented on YARN-3612:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 29s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 1 new or modified test files. |
| {color:green}+1{color} | javac |   7m 31s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 32s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 52s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 37s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 24s | The patch does not introduce 
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | yarn tests |   1m 56s | Tests passed in 
hadoop-yarn-common. |
| | |  38m 19s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12731807/YARN-3612.02.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 4536399 |
| hadoop-yarn-common test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/7856/artifact/patchprocess/testrun_hadoop-yarn-common.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/7856/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf906.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/7856/console |


This message was automatically generated.

> 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
>              Labels: BB2015-05-RFC, performance
>         Attachments: MAPREDUCE-4469.patch, MAPREDUCE-4469_rev2.patch, 
> MAPREDUCE-4469_rev3.patch, MAPREDUCE-4469_rev4.patch, 
> MAPREDUCE-4469_rev5.patch, YARN-3612.01.patch, YARN-3612.02.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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