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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2018/09/25 12:47:00 UTC
[jira] [Resolved] (LUCENE-3654) Optimize BytesRef comparator to use
Unsafe long based comparison (when possible)
[ https://issues.apache.org/jira/browse/LUCENE-3654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand resolved LUCENE-3654.
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Resolution: Implemented
Since LUCENE-7966, when using Java 9 or higher, BytesRef comparators will use Arrays#compareUnsigned and Arrays#equals which can compare multiple bytes at once.
> Optimize BytesRef comparator to use Unsafe long based comparison (when possible)
> --------------------------------------------------------------------------------
>
> Key: LUCENE-3654
> URL: https://issues.apache.org/jira/browse/LUCENE-3654
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index, core/search
> Reporter: Shay Banon
> Priority: Major
> Attachments: LUCENE-3654.patch
>
>
> Inspire by Google Guava UnsignedBytes lexi comparator, that uses unsafe to do long based comparisons over the bytes instead of one by one (which yields 2-4x better perf), use similar logic in BytesRef comparator. The code was adapted to support offset/length.
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