hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10674) Rewrite the PureJavaCrc32 loop for performance improvement
Date Thu, 12 Jun 2014 02:12:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028743#comment-14028743
] 

Gopal V commented on HADOOP-10674:
----------------------------------

[~szetszwo]: Rajesh tested it on the same linux box. Not going to duplicate that.

FYI, I hit cross-thread slowdowns when testing out HADOOP-9601. Might be worth writing a threadpool
test (for HDFS daemons, not MR tasks).

> 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.



--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message