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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7446) Implement CRC32C native code using SSE4.2 instructions
Date Tue, 23 Aug 2011 03:39:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089250#comment-13089250
] 

Kihwal Lee commented on HADOOP-7446:
------------------------------------

It was a test and you passed. I am just kidding. :)
Thanks for fixing my buggy code. 

> Implement CRC32C native code using SSE4.2 instructions
> ------------------------------------------------------
>
>                 Key: HADOOP-7446
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7446
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: native
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>
>         Attachments: crc-pipeline-fix.txt, hadoop-7446.txt, hadoop-7446.txt, hadoop-7446.txt,
pipelined_on_todds_patch.txt, pipelined_with_todds_patch.txt
>
>
> Once HADOOP-7445 is implemented, we can get further performance improvements by implementing
CRC32C using the hardware support available in SSE4.2. This support should be dynamically
enabled based on CPU feature flags, and of course should be ifdeffed properly so that it doesn't
break the build on architectures/platforms where it's not available.

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