[ 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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