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https://issues.apache.org/jira/browse/TEZ-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated TEZ-2849:
-------------------------
Description:
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/
was:
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).
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/
> 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
>
> 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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