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From "Ferdinand Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11521) Loop optimization for SIMD in logical operators
Date Tue, 11 Aug 2015 15:46:46 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14681969#comment-14681969
] 

Ferdinand Xu commented on HIVE-11521:
-------------------------------------

The result looks awesome. Do you have any data about the performance improvement when using
HQL to retrieve a data set?

> Loop optimization for SIMD in logical operators
> -----------------------------------------------
>
>                 Key: HIVE-11521
>                 URL: https://issues.apache.org/jira/browse/HIVE-11521
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Teddy Choi
>            Assignee: Teddy Choi
>            Priority: Minor
>         Attachments: HIVE-11521.patch
>
>
> JVM is quite strict on the code schema which may executed with SIMD instructions, take
a loop in ColOrCol.java for example,
> {code}
> for (int i = 0; i != n; i++) {
>   outputVector[i] = vector1[0] | vector2[i];
> }
> {code}
> The "vector1\[0\]" reference would prevent JVM to execute this part of code with vectorized
instructions, we need to assign the "vector1\[0\]" to a variable outside of loop, and use
that variable in loop.
> This issues covers AND, OR, NOT logical operators.



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