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From "Robert Muir (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3667) Consider changing how we set the number of threads to use to run tests.
Date Fri, 30 Dec 2011 16:27:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177692#comment-13177692
] 

Robert Muir commented on LUCENE-3667:
-------------------------------------

{quote}
Because fewer threads = more likely collision of two bad apples and total time = max(thread
time)? With history of executions and greedy balancing this shouldn't be the case anymore.
{quote}

Well not just that, in general the bad apples should be fixed, we just sorta dodged the problem
in some cases by cranking up parallelism.

I agree that better balancing will help (but its still dodging the root cause if a test sometimes
takes like 30 seconds)
                
> 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
>         Attachments: LUCENE-3667.patch, LUCENE-3667.patch, LUCENE-3667.patch
>
>
> 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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