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From "Johan Stuyts (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-640) [PATCH] Performance improvement for doNext() of ConjunctionScorer
Date Fri, 28 Jul 2006 09:29:15 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-640?page=all ]

Johan Stuyts updated LUCENE-640:
--------------------------------

    Attachment: Lucene2ConjunctionScorerDoNextPerformance.patch

Optimization of 'doNext()' of 'ConjunctionScorer'.

> [PATCH] Performance improvement for doNext() of ConjunctionScorer
> -----------------------------------------------------------------
>
>                 Key: LUCENE-640
>                 URL: http://issues.apache.org/jira/browse/LUCENE-640
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 2.0.0
>            Reporter: Johan Stuyts
>         Attachments: Lucene2ConjunctionScorerDoNextPerformance.patch
>
>
> I was able to improve the performance of 'doNext() of 'ConjunctionScorer' by over 20%
by storing the result of some calls that were performed multiple times in local variables.
The test program invoked the method over 400,000 times on each run.
> I ran the performance tests on: 
> - Windows XP Pro SP2 
> - Sun JDK 1.5.0_07 
> - YourKit 5.5.4 
> - Lucene trunk

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