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https://issues.apache.org/jira/browse/HBASE-23779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032751#comment-17032751
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Michael Stack commented on HBASE-23779:
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Ok. An the next run, 
https://builds.apache.org/view/H-L/view/HBase/job/HBase%20Nightly/job/branch-2/2458/artifact/,
 hadoop2 test got cut off as in previous run. hadoop3 test made it to the end 
but a bunch of them timedout w/ process exit complaint.

Reverting the changes in dev-support/hbase-personality.sh from my patch where I 
try to add -T0.5C to all mvn invocations. Will leave it as default 
single-threaded for now.

> Up the default fork count to make builds complete faster; make count relative 
> to CPU count
> ------------------------------------------------------------------------------------------
>
>                 Key: HBASE-23779
>                 URL: https://issues.apache.org/jira/browse/HBASE-23779
>             Project: HBase
>          Issue Type: Bug
>          Components: test
>            Reporter: Michael Stack
>            Assignee: Michael Stack
>            Priority: Major
>             Fix For: 3.0.0, 2.3.0
>
>         Attachments: addendum2.patch, test_yetus_934.0.patch
>
>
> Tests take a long time. Our fork count running all tests are conservative -- 
> 1 (small) for first part and 5 for second part (medium and large). Rather 
> than hardcoding we should set the fork count to be relative to machine size. 
> Suggestion here is 0.75C where C is CPU count. This ups the CPU use on my box.
> Looking up at jenkins, it seems like the boxes are 24 cores... at least going 
> by my random survey. The load reported on a few seems low though this not 
> representative (looking at machine/uptime).
> More parallelism willl probably mean more test failure. Let me take a look 
> see.



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