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Posted to dev@parquet.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2020/03/24 18:11:00 UTC

[jira] [Commented] (PARQUET-1786) [C++] Use simd to improve BYTE_STREAM_SPLIT decoding performance

    [ https://issues.apache.org/jira/browse/PARQUET-1786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17066070#comment-17066070 ] 

Antoine Pitrou commented on PARQUET-1786:
-----------------------------------------

Can you please open a separate issue for the encoder?

> [C++] Use simd to improve BYTE_STREAM_SPLIT decoding performance
> ----------------------------------------------------------------
>
>                 Key: PARQUET-1786
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1786
>             Project: Parquet
>          Issue Type: Improvement
>          Components: parquet-cpp
>            Reporter: Martin Radev
>            Assignee: Martin Radev
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: cpp-1.6.0
>
>          Time Spent: 7h 10m
>  Remaining Estimate: 0h
>
> BYTE_STREAM_SPLIT essentially does a scatter/gather operation in the encode/decoder paths. Unfortunately, it is not as fast as memcpy when the data is cached. That can be improved through using simd intrinsics.



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