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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6166) Improve PureJavaCrc32
Date Fri, 14 Aug 2009 20:21:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743416#action_12743416
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-6166:
------------------------------------------------

Thanks, Todd.  

8_8b is also best in my benchmark ran on Windows.

Question: Crc32Base and Crc32Table are not crc implementations.  What do they mean in the
graph?

> Improve PureJavaCrc32
> ---------------------
>
>                 Key: HADOOP-6166
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6166
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: c6166_20090722.patch, c6166_20090722_benchmark_32VM.txt, c6166_20090722_benchmark_64VM.txt,
c6166_20090727.patch, c6166_20090728.patch, c6166_20090810.patch, c6166_20090811.patch, graph.r,
graph.r, Rplots.pdf, Rplots.pdf
>
>
> Got some ideas to improve CRC32 calculation.

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