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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2021/08/12 17:29:00 UTC

[jira] [Commented] (ARROW-13619) [C++] Hash aggregation seems to ignore ARROW_USER_SIMD_LEVEL

    [ https://issues.apache.org/jira/browse/ARROW-13619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17398195#comment-17398195 ] 

Antoine Pitrou commented on ARROW-13619:
----------------------------------------

cc [~westonpace] [~michalno]  Can one of you take a look at this?

> [C++] Hash aggregation seems to ignore ARROW_USER_SIMD_LEVEL
> ------------------------------------------------------------
>
>                 Key: ARROW-13619
>                 URL: https://issues.apache.org/jira/browse/ARROW-13619
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 5.0.0
>            Reporter: Antoine Pitrou
>            Priority: Major
>             Fix For: 6.0.0
>
>
> The {{ARROW_USER_SIMD_LEVEL}} environment variable allows to override the SIMD optimization level at runtime. For example {{ARROW_USER_SIMD_LEVEL=NONE}} is useful to benchmark a non-SIMD path.
> However, it seems the hash aggregation code doesn't react to this. Hence, on an AVX2-enabled machine (which is really the majority of high-end x86 computers), it's cumbersome to run benchmarks for these code paths.



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