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https://issues.apache.org/jira/browse/LUCENE-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-3648:
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Attachment: LUCENE-3648.patch
latest patch... I plan to commit this tomorrow if nobody objects
> Speed up SegementDocsEnum by making it more friendly for JIT optimizations
> --------------------------------------------------------------------------
>
> Key: LUCENE-3648
> URL: https://issues.apache.org/jira/browse/LUCENE-3648
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/codecs, core/search
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3648.patch, LUCENE-3648.patch, LUCENE-3648.patch
>
>
> Since we moved the bulk reading into the codec ie. make all bulk reading
> codec private in LUCENE-3584 we have seen some performance
> [regression|http://people.apache.org/~mikemccand/lucenebench/Term.html] on
> different CPUs. I tried to optimize the implementation to make it more
> eligible for runtime optimizations, tried to make loops JIT friendly by
> moving out branches where I can, minimize member access in all loops, use
> final members where possible and specialize the two common cases With &
> Without LiveDocs.
> I will attache a patch and my benchmark results in a minute.
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