Speed up SegementDocsEnum by making it more friendly for JIT optimizations
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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
Fix For: 4.0
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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