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https://issues.apache.org/jira/browse/HBASE-23779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034097#comment-17034097
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Mark Robert Miller commented on HBASE-23779:
--------------------------------------------

FYI re: the -T arg

I'm finding it's pretty sensitive to the Maven version - the 3.5.* I seem to 
get from the yetus Dockerfile in dev-support is crashing all the time, 3.6.1 
has been behaving as I've been used to (my main desktop had 3.6.1 to start)

> 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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