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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11660) Add support for hardware crc on ARM aarch64 architecture
Date Tue, 17 Mar 2015 16:58:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14365521#comment-14365521
] 

Hadoop QA commented on HADOOP-11660:
------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12705102/jira-11660.patch
  against trunk revision 7179f94.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/5958//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/5958//console

This message is automatically generated.

> Add support for hardware crc on ARM aarch64 architecture
> --------------------------------------------------------
>
>                 Key: HADOOP-11660
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11660
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: native
>    Affects Versions: 3.0.0
>         Environment: ARM aarch64 development platform
>            Reporter: Edward Nevill
>            Assignee: Edward Nevill
>            Priority: Minor
>              Labels: performance
>         Attachments: jira-11660.patch
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> This patch adds support for hardware crc for ARM's new 64 bit architecture
> The patch is completely conditionalized on __aarch64__
> I have only added support for the non pipelined version as I benchmarked the pipelined
version on aarch64 and it showed no performance improvement.
> The aarch64 version supports both Castagnoli and Zlib CRCs as both of these are supported
on ARM aarch64 hardwre.
> To benchmark this I modified the test_bulk_crc32 test to print out the time taken to
CRC a 1MB dataset 1000 times.
> Before:
> CRC 1048576 bytes @ 512 bytes per checksum X 1000 iterations = 2.55
> CRC 1048576 bytes @ 512 bytes per checksum X 1000 iterations = 2.55
> After:
> CRC 1048576 bytes @ 512 bytes per checksum X 1000 iterations = 0.57
> CRC 1048576 bytes @ 512 bytes per checksum X 1000 iterations = 0.57
> So this represents a 5X performance improvement on raw CRC calculation.



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