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Posted to issues-all@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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