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Date: Tue, 10 Mar 2015 21:35:38 +0000 (UTC)
From: "Edward Nevill (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HADOOP-11660) Add support for hardware crc on ARM
 aarch64 architecture
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     [ https://issues.apache.org/jira/browse/HADOOP-11660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edward Nevill updated HADOOP-11660:
-----------------------------------
    Attachment: bulk_crc32.c

> 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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