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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5915) Improve performance of KeyValue comparison
Date Wed, 02 May 2012 16:10:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266662#comment-13266662
] 

stack commented on HBASE-5915:
------------------------------

It looks great Todd.

This is funny (when wrong-endian) --> +          return Long.reverseBytes(result);

Nice --> +        final int minWords = minLength >>> 3; // / SIZEOF_LONG;....
that should be faster.


                
> Improve performance of KeyValue comparison
> ------------------------------------------
>
>                 Key: HBASE-5915
>                 URL: https://issues.apache.org/jira/browse/HBASE-5915
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance
>    Affects Versions: 0.94.1
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hbase-5915.txt
>
>
> Got bored tonight and poked around at making KeyValue comparison faster. I was able to
get a ~23% speedup on a micro-benchmark I wrote by using Unsafe in a few more places. This
should make some difference for real workloads, since this is usually one of the top CPU consumers.

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