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https://issues.apache.org/jira/browse/LUCENE-1709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850363#action_12850363
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Robert Muir commented on LUCENE-1709:
-------------------------------------

bq. The ANT <uptodate/> specialist will look into this!

Ok, thanks uwe.

I will commit this shortly, and send a note to both dev lists mentioning to run 
ant clean for the time being for any old checkouts.

I think most people will prefer shaving minutes off their test time for a one 
time-clean... unless anyone objects!


> Parallelize Tests
> -----------------
>
>                 Key: LUCENE-1709
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1709
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.4.1
>            Reporter: Jason Rutherglen
>             Fix For: 3.1
>
>         Attachments: LUCENE-1709.patch, LUCENE-1709.patch, LUCENE-1709.patch, 
> LUCENE-1709.patch, LUCENE-1709.patch, LUCENE-1709.patch, runLuceneTests.py
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> The Lucene tests can be parallelized to make for a faster testing system.  
> This task from ANT can be used: 
> http://ant.apache.org/manual/CoreTasks/parallel.html
> Previous discussion: 
> http://www.gossamer-threads.com/lists/lucene/java-dev/69669
> Notes from Mike M.:
> {quote}
> I'd love to see a clean solution here (the tests are embarrassingly
> parallelizable, and we all have machines with good concurrency these
> days)... I have a rather hacked up solution now, that uses
> "-Dtestpackage=XXX" to split the tests up.
> Ideally I would be able to say "use N threads" and it'd do the right
> thing... like the -j flag to make.
> {quote}

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