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Posted to issues@lucene.apache.org by "Adrien Grand (Jira)" <ji...@apache.org> on 2021/10/04 13:27:00 UTC
[jira] [Commented] (LUCENE-10145) Use VarHandles to speedup byte[]
comparisons in some cases
[ https://issues.apache.org/jira/browse/LUCENE-10145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423945#comment-17423945 ]
Adrien Grand commented on LUCENE-10145:
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With the linked PR I got 13% faster merging for points with the NYC Taxis benchmark, thanks to changes to BKDMergeQueue. Since this helped significantly, I generalized the approach to other places where we keep comparing fixed numbers of bytes and this number of bytes is often 4 or 8 such as PointRangeQuery.
> Use VarHandles to speedup byte[] comparisons in some cases
> ----------------------------------------------------------
>
> Key: LUCENE-10145
> URL: https://issues.apache.org/jira/browse/LUCENE-10145
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I noticed that using Long#compareUnsigned on longs read via VarHandles is significantly faster than calling compareUnsigned directly. There are cases when this could be leveraged easily such as BKDWriter, which often keeps comparing 4-bytes or 8-bytes across byte[] arrays.
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