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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11660) Add support for hardware crc of HDFS checksums on ARM aarch64 architecture
Date Tue, 31 Mar 2015 18:44:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389142#comment-14389142
] 

Hudson commented on HADOOP-11660:
---------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #2099 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2099/])
HADOOP-11660. Add support for hardware crc of HDFS checksums on ARM aarch64 architecture (Edward
Nevill via Colin P. McCabe) (cmccabe: rev d9ac5ee2c4dcd4a108ca892af501618caaea450c)
* hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestNativeCrc32.java
* hadoop-common-project/hadoop-common/src/main/native/src/test/org/apache/hadoop/util/test_bulk_crc32.c
* hadoop-common-project/hadoop-common/CHANGES.txt
* hadoop-common-project/hadoop-common/src/CMakeLists.txt
* hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32_aarch64.c
* hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32.c
* hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32_x86.c


> Add support for hardware crc of HDFS checksums 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: 2.8.0
>         Environment: ARM aarch64 development platform
>            Reporter: Edward Nevill
>            Assignee: Edward Nevill
>            Priority: Minor
>              Labels: performance
>             Fix For: 2.8.0
>
>         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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