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Posted to common-issues@hadoop.apache.org by "Tsz Wo Nicholas Sze (JIRA)" <ji...@apache.org> on 2014/06/10 00:25:01 UTC
[jira] [Updated] (HADOOP-10674) Rewrite the PureJavaCrc32 loop for
performance improvement
[ https://issues.apache.org/jira/browse/HADOOP-10674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsz Wo Nicholas Sze updated HADOOP-10674:
-----------------------------------------
Issue Type: Improvement (was: Bug)
> 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
>
> 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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