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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10674) Rewrite the PureJavaCrc32 loop for performance improvement
Date Wed, 11 Jun 2014 02:34:02 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo Nicholas Sze updated HADOOP-10674:
-----------------------------------------

    Attachment: c10674_20140610.patch

c10674_20140610.patch:
- performance improvement from 45% to 60%;
- using java.util.zip.CRC32 for Java 7 or above.

> Rewrite the PureJavaCrc32 loop for performance improvement
> ----------------------------------------------------------
>
>                 Key: HADOOP-10674
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10674
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: performance, util
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: c10674_20140609.patch, c10674_20140609b.patch, c10674_20140610.patch
>
>
> Below are some performance improvement opportunities performance improvement in PureJavaCrc32.
> - eliminate "off += 8; len -= 8;"
> - replace T8_x_start with hard coded constants
> - eliminate c0 - c7 local variables
> In my machine, there are 30% to 50% improvement for most of the cases.



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