[jira] [Assigned] (ARROW-11905) SIMD info always returning none on MacOS

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-11905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou reassigned ARROW-11905:
--------------------------------------

    Assignee: Antoine Pitrou

> SIMD info always returning none on MacOS
> ----------------------------------------
>
>                 Key: ARROW-11905
>                 URL: https://issues.apache.org/jira/browse/ARROW-11905
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Jonathan Keane
>            Assignee: Antoine Pitrou
>            Priority: Major
>
> I'm helping with ARROW-11507 and in testing it I noticed something odd, I'm getting none and none for both simd_level and detected_simd_level which seems odd. I also tried it in pyarrow (below) and I'm getting the same thing (this was built off of HEAD of apache/arrow) so I suspect that this is something lower than either of them (and in both {{runtime_info}} is a think wrapper around the c++).
> {code:python}
> >>> import pyarrow as pa
> >>> pa.runtime_info()
> RuntimeInfo(simd_level='none', detected_simd_level='none')
> {code}
> I do see the following when building:
> {code}
> --   ARROW_SIMD_LEVEL=SSE4_2 [default=NONE|SSE4_2|AVX2|AVX512]
> --       Compile-time SIMD optimization level
> --   ARROW_RUNTIME_SIMD_LEVEL=MAX [default=NONE|SSE4_2|AVX2|AVX512|MAX]
> --       Max runtime SIMD optimization level
> and sse/avx etc are built:
> -- Performing Test CXX_SUPPORTS_SSE4_2
> -- Performing Test CXX_SUPPORTS_SSE4_2 - Success
> -- Performing Test CXX_SUPPORTS_AVX2
> -- Performing Test CXX_SUPPORTS_AVX2 - Success
> -- Performing Test CXX_SUPPORTS_AVX512
> -- Performing Test CXX_SUPPORTS_AVX512 - Success
> {code}
> I've also tried confirming that ARROW_USER_SIMD_LEVEL is unset, and tried setting it explicitly:
> {code}
> (pyarrow-source) jkeane@het python % ARROW_USER_SIMD_LEVEL=sse4_2 python
> Python 3.9.2 (default, Feb 24 2021, 13:26:09)
> [Clang 12.0.0 (clang-1200.0.32.29)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import pyarrow as pa
> >>> pa.runtime_info()
> RuntimeInfo(simd_level='none', detected_simd_level='none')
> {code}
> I've tested it on two macOS machines (both running on intel chips) and both had the same behavior above. This appears to work on linux machines just fine.



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