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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10778) Use NativeCrc32 only if it is faster
Date Mon, 07 Jul 2014 19:40:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054092#comment-14054092
] 

Tsz Wo Nicholas Sze commented on HADOOP-10778:
----------------------------------------------

> The original JIRA also noted that OpenJDK was faster than Oracle's JDK at the time. So
perhaps that's the difference you're seeing between java 7 and java 6? Are you testing OpenJDK
in both cases or is it Oracle JDK 6?

>From the java.vm.vendor property, the Java 6 and Java 7 I used are respectively Apple
and Oracle.  Please help running the benchmark with different hardware and JDKs.

> Use NativeCrc32 only if it is faster
> ------------------------------------
>
>                 Key: HADOOP-10778
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10778
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: c10778_20140702.patch
>
>
> From the benchmark post in [this comment|https://issues.apache.org/jira/browse/HDFS-6560?focusedCommentId=14044060&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14044060],
NativeCrc32 is slower than java.util.zip.CRC32 for Java 7 and above when bytesPerChecksum
> 512.



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