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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3654) Optimize BytesRef comparator to use Unsafe long based comparison (when possible)
Date Sun, 18 Dec 2011 08:54:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171802#comment-13171802
] 

Uwe Schindler commented on LUCENE-3654:
---------------------------------------

What do we have to lose, it's like with MMapDirectory, a few tests on startup and setting
a reference to the improved comparator and done? Indeed we need compile-time checking (import
of the Unsafe class), but if there are incompatible changes we will see on runtime linking
and automatically fall back to the Java-Only comparator.
                
> 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 - Java
>          Issue Type: Improvement
>          Components: core/index, core/search
>            Reporter: Shay Banon
>         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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