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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/05/29 05:48:39 UTC

[GitHub] [arrow] cyb70289 commented on pull request #7300: ARROW-8844: [C++] Transfer bitmap in words

cyb70289 commented on pull request #7300:
URL: https://github.com/apache/arrow/pull/7300#issuecomment-635773456


   Tested on AMD Zen1 with gcc-7.5
   
   before (CopyBitmapWithOffsetBoth is added by this patch)
   ```
   CopyBitmapWithoutOffset/8192                  190 ns          190 ns      3678223 bytes_per_second=40.0804G/s
   CopyBitmapWithOffset/8192                    8548 ns         8548 ns        81846 bytes_per_second=914.007M/s
   CopyBitmapWithOffsetBoth/8192               95447 ns        95445 ns         7334 bytes_per_second=81.8531M/s
   ```
   
   after
   ```
   CopyBitmapWithoutOffset/8192                  191 ns          191 ns      3670699 bytes_per_second=39.9939G/s
   CopyBitmapWithOffset/8192                    1151 ns         1151 ns       600632 bytes_per_second=6.62768G/s
   CopyBitmapWithOffsetBoth/8192                2018 ns         2018 ns       346761 bytes_per_second=3.78089G/s
   ```


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