[jira] [Commented] (TEZ-2849) Implement Specific Workaround for JDK-8026049 & JDK-8073093

["Tsuyoshi Ozawa (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940866#comment-14940866 ] 

Tsuyoshi Ozawa commented on TEZ-2849:
-------------------------------------

[~gopalv] thanks for your patch! I'll take a benchmark with your patch in this weekend. Please wait a moment.

> Implement Specific Workaround for JDK-8026049 & JDK-8073093 
> ------------------------------------------------------------
>
>                 Key: TEZ-2849
>                 URL: https://issues.apache.org/jira/browse/TEZ-2849
>             Project: Apache Tez
>          Issue Type: Sub-task
>    Affects Versions: 0.8.1
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: TEZ-2849.1.patch
>
>
> The CPU performance overhead of the sort operation is tied to the JIT handling of the aliased byte buffers without an explicit alignment (i.e a byte[] buffer referenced as an IntBuffer).
> https://bugs.openjdk.java.net/browse/JDK-8026049
> +
> https://bugs.openjdk.java.net/browse/JDK-8073093
> Workaround that JIT limitation while keeping in mind the modern CPU micro-code optimizations around alignment.
> http://lemire.me/blog/archives/2012/05/31/data-alignment-for-speed-myth-or-reality/



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