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From "Johan Stuyts (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-639) [PATCH] Slight performance improvement for readVInt() of IndexInput
Date Thu, 03 Aug 2006 09:04:15 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-639?page=comments#action_12425473 ] 
            
Johan Stuyts commented on LUCENE-639:
-------------------------------------

I don't know what your test method is but a difference of 13-15% is very unlikely. The algorithms
are too simple to have such a dramatic effect on performance.

It is possible that the test that I provided is flawed. Just let me know what should be changed,
and I will update it and rerun the tests.


> [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, readVInt performance results.pdf,
ReadVIntPerformanceMain.java
>
>
> 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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