[ http://issues.apache.org/jira/browse/LUCENE-639?page=all ]
Johan Stuyts updated LUCENE-639:
--------------------------------
Attachment: Lucene2ReadVIntPerformance.patch
Loop unrolling in 'readVInt()' of 'IndexInput' for slight performance gain.
> [PATCH] Slight performance improvement for readVInt() of IndexInput
> -------------------------------------------------------------------
>
> Key: LUCENE-639
> URL: http://issues.apache.org/jira/browse/LUCENE-639
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.0.0
> Reporter: Johan Stuyts
> Priority: Minor
> Attachments: Lucene2ReadVIntPerformance.patch
>
>
> By unrolling the loop in readVInt() I was able to get a slight, about 1.8 %,
> performance improvement for this method. The test program invoked the method
> over 17 million 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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