You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@tez.apache.org by "Hitesh Shah (JIRA)" <ji...@apache.org> on 2015/11/04 01:03:27 UTC
[jira] [Commented] (TEZ-2849) Implement Specific Workaround for
JDK-8026049 & JDK-8073093
[ https://issues.apache.org/jira/browse/TEZ-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988517#comment-14988517 ]
Hitesh Shah commented on TEZ-2849:
----------------------------------
Is this good to commit?
> 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-alpha
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: TEZ-2849.1.patch, TEZ-2849.2.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/
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)