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From "Simon Willnauer (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3654) Optimize BytesRef comparator to use Unsafe long based comparison (when possible)
Date Sat, 17 Dec 2011 22:13:31 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171695#comment-13171695
] 

Simon Willnauer commented on LUCENE-3654:
-----------------------------------------

Shay, thanks for doing this. Somebody mentioned this on the list earlier. I will take your
patch and remove all the formatting if you don't mind. I think this makes lots of sense especially
if you have really long references.
                
> 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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