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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6166) Improve PureJavaCrc32
Date Thu, 23 Jul 2009 01:55:14 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE updated HADOOP-6166:
-------------------------------------------

    Attachment: c6166_20090722_benchmark_32VM.txt
                c6166_20090722_benchmark_64VM.txt

c6166_20090722_benchmark_64VM.txt, c6166_20090722_benchmark_32VM.txt: Tested the implementations
on both 32-bit and 64-bit VMs.  Seems that Crc32_4_3 are faster than current PureJavaCrc32
in both cases.

(Sorry that I still have not tested with TestPureJavaCrc32.PerformanceTest.)

> 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
>
>
> Got some ideas to improve CRC32 calculation.

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