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https://issues.apache.org/jira/browse/LUCENE-3667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175731#comment-13175731
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Robert Muir commented on LUCENE-3667:
-------------------------------------
{quote}
Its not a 'restricted' system - like a little under powered laptop - it's a
fast quad core system that doesn't like our tests because its got 8 GB of RAM
instead 16 (and I run a lot of RAM hungry apps) and because hyper threading
causes the processor count to basically be a lie.
{quote}
I have the same configuration on my desktop (quad-core HT 8GB ram), and its
always happy.
On my mac though (dual-core HT 4GB ram) running the tests 'owns' the machine
completely.
I figured its probably the i/o (my desktop has SSD)...
> Consider changing how we set the number of threads to use to run tests.
> -----------------------------------------------------------------------
>
> Key: LUCENE-3667
> URL: https://issues.apache.org/jira/browse/LUCENE-3667
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Minor
>
> The current way we set the number of threads to use is not expressive enough
> for some systems. My quad core with hyper threading is recognized as 8 CPUs -
> since I can only override the number of threads to use per core, 8 is as low
> as I can go. 8 threads can be problematic for me - just the amount of RAM
> used sometimes can toss me into heavy paging because I only have 8 GB of RAM
> - the heavy paging can cause my whole system to come to a crawl. Without
> hacking the build, I don't think I have a lot of workarounds.
> I'd like to propose that switch from using threadsPerProcessor to
> threadCount. In some ways, it's not as nice, because it does not try to scale
> automatically per system. But that auto scaling is often not ideal (hyper
> threading, wanting to be able to do other work at the same time), so perhaps
> we just default to 1 or 2 threads and devs can override individually?
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