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https://issues.apache.org/jira/browse/LUCENE-1485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655385#action_12655385
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Grant Ingersoll commented on LUCENE-1485:
-----------------------------------------
Is the "slightly" in the noise?
> Use OpenBitSet instead of BitVector in SegmentReader
> ----------------------------------------------------
>
> Key: LUCENE-1485
> URL: https://issues.apache.org/jira/browse/LUCENE-1485
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4
> Reporter: Jason Rutherglen
> Priority: Minor
> Attachments: TestDeletedDocsSpeed.java
>
> Original Estimate: 96h
> Remaining Estimate: 96h
>
> Tried out BitVector.get vs OpenBitSet.get here's the results which are about
> the same after running 25 times in milliseconds. It is assumed that
> implementing DocIdSetIterator in SegmentTermDocs will speed things up more.
> bit set size: 10,485,760
> set bits count: 524,032
> openbitset: 68
> bitvector: 89
> 24% speed increase.
> I will implement a patch that adds the WriteableBitSet interface and make a
> subclass of OpenBitSet that is writeable to disk. We're working on an
> isSparse method for OpenBitSet.
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