pitrou edited a comment on pull request #8177:
URL: https://github.com/apache/arrow/pull/8177#issuecomment-692860379
`parquet-level-conversion-benchmark` (AMD Zen 2, clang 10, Ubuntu 20.04):
* before:
```
BM_DefinitionLevelsToBitmapRepeatedAllMissing 966 ns 966 ns
714328 bytes_per_second=1.9753G/s
BM_DefinitionLevelsToBitmapRepeatedAllPresent 1626 ns 1626 ns
426358 bytes_per_second=1.173G/s
BM_DefinitionLevelsToBitmapRepeatedMostPresent 1850 ns 1850 ns
367809 bytes_per_second=1055.83M/s
```
* after:
```
BM_DefinitionLevelsToBitmapRepeatedAllMissing 560 ns 560 ns
1239730 bytes_per_second=3.40515G/s
BM_DefinitionLevelsToBitmapRepeatedAllPresent 562 ns 562 ns
1244256 bytes_per_second=3.39684G/s
BM_DefinitionLevelsToBitmapRepeatedMostPresent 562 ns 562 ns
1244691 bytes_per_second=3.39515G/s
```
Impressive!
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