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