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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6166) Improve PureJavaCrc32
Date Mon, 17 Aug 2009 02:32:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743950#action_12743950
] 

Todd Lipcon commented on HADOOP-6166:
-------------------------------------

Ran the same benchmarks with java -d32 -server and the results are indistinguishable (I guess
since the benchmarks run a long time the client VM does just as much JIT as the server VM).

So, pending anyone coming up with evidence that we should fine tune for the really-small-checksum
case on processors like my laptop, 8_8d wins by enough of a margin it seems worth doing.

> 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-laptop.pdf, Rplots-nehalem32.pdf, Rplots-nehalem64.pdf, Rplots.pdf, Rplots.pdf,
Rplots.pdf
>
>
> Got some ideas to improve CRC32 calculation.

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