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From "Robert Muir (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-3667) Consider changing how we set the number of threads to use to run tests.
Date Fri, 30 Dec 2011 19:28:31 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-3667:
--------------------------------

    Attachment: LUCENE-3667.patch

updated patch, with a timeout on the ContentStreamTest so it doesnt hang forever if svn.apache.org
is down, and fixing test fsync slowness issues by using LuceneTestCase.newDirectory() in solr
tests (on local runs this uses ramdirectory 95% of the time, fsdirectory other times, in hudson
it uses fsdirectory more often). 
                
> 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, 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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