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Posted to issues@impala.apache.org by "Daniel Becker (Jira)" <ji...@apache.org> on 2020/06/05 07:51:00 UTC
[jira] [Closed] (IMPALA-8741) Speed up bit unpacking by
vectorisation
[ https://issues.apache.org/jira/browse/IMPALA-8741?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daniel Becker closed IMPALA-8741.
---------------------------------
Resolution: Abandoned
> Speed up bit unpacking by vectorisation
> ---------------------------------------
>
> Key: IMPALA-8741
> URL: https://issues.apache.org/jira/browse/IMPALA-8741
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
> Attachments: demo3.png
>
>
> Using compiler intrinsics for SIMD and bit manipulation instructions (AVX, AVX2 and BMI2), we can speed up bit unpacking by a factor of about 2 to 8 depending on bit width, at most 16.
> We need to take care to check that the required instructions are supported by the CPU the impalad is running on and fall back to the scalar implementation if not.
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