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https://issues.apache.org/jira/browse/HADOOP-11660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14361313#comment-14361313
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Colin Patrick McCabe commented on HADOOP-11660:
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Hi Edward,
What's the rationale for not splitting the file into multiple files per
architecture as I asked in this comment:
https://issues.apache.org/jira/browse/HADOOP-11660?focusedCommentId=14350788&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14350788
? Also, I would prefer not to drop support for architectures, even if they
are 32-bit x86.
> 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: bulk_crc32.c, jira-11660-new.patch, 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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