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https://issues.apache.org/jira/browse/HADOOP-11660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14388429#comment-14388429
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Hudson commented on HADOOP-11660:
---------------------------------
SUCCESS: Integrated in Hadoop-Yarn-trunk #883 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk/883/])
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/main/native/src/org/apache/hadoop/util/bulk_crc32_aarch64.c
* hadoop-common-project/hadoop-common/src/CMakeLists.txt
*
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/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
* hadoop-common-project/hadoop-common/CHANGES.txt
> 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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