pitrou commented on PR #39403:
URL: https://github.com/apache/arrow/pull/39403#issuecomment-1932082904
This PR *decreases* performance here (AMD Ryzen 9 3900X, gcc 12.3.0):
* before:
```
--------------------------------------------------------------------------------------------------------------------------------------------
Benchmark
Time CPU Iterations UserCounters...
--------------------------------------------------------------------------------------------------------------------------------------------
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
2325 ns 2326 ns 298740 bytes_per_second=6.48372Gi/s
items_per_second=3.48092G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
8060 ns 8059 ns 87115 bytes_per_second=1.87109Gi/s
items_per_second=1.00453G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
668 ns 670 ns 1046591 bytes_per_second=22.5109Gi/s
items_per_second=12.0854G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
2122 ns 2123 ns 330590 bytes_per_second=7.10169Gi/s
items_per_second=3.81269G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
1948 ns 1949 ns 356752 bytes_per_second=7.7368Gi/s
items_per_second=4.15367G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1777 ns 1778 ns 395234 bytes_per_second=8.48193Gi/s
items_per_second=4.5537G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
7568 ns 7568 ns 91365 bytes_per_second=1.99251Gi/s
items_per_second=1.06972G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
1252 ns 1257 ns 560376 bytes_per_second=11.9933Gi/s
items_per_second=6.43886G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
1257 ns 1263 ns 556189 bytes_per_second=11.9407Gi/s
items_per_second=6.41061G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
1316 ns 1322 ns 550602 bytes_per_second=11.4078Gi/s
items_per_second=6.12452G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1300 ns 1306 ns 517873 bytes_per_second=11.5467Gi/s
items_per_second=6.19908G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
1312 ns 1318 ns 456593 bytes_per_second=11.4407Gi/s
items_per_second=6.14218G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1250 ns 1256 ns 562519 bytes_per_second=12.0082Gi/s
items_per_second=6.44683G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
1301 ns 1307 ns 519667 bytes_per_second=11.5369Gi/s
items_per_second=6.19383G/s
```
* after:
```
--------------------------------------------------------------------------------------------------------------------------------------------
Benchmark
Time CPU Iterations UserCounters...
--------------------------------------------------------------------------------------------------------------------------------------------
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
2563 ns 2566 ns 273640 bytes_per_second=5.87793Gi/s
items_per_second=3.15569G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
8134 ns 8135 ns 85865 bytes_per_second=1.85376Gi/s
items_per_second=995.23M/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
725 ns 726 ns 956867 bytes_per_second=20.7575Gi/s
items_per_second=11.1441G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
2304 ns 2306 ns 302796 bytes_per_second=6.53916Gi/s
items_per_second=3.51068G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
2087 ns 2089 ns 334483 bytes_per_second=7.21913Gi/s
items_per_second=3.87574G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1849 ns 1851 ns 377499 bytes_per_second=8.14629Gi/s
items_per_second=4.37351G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
8214 ns 8216 ns 85257 bytes_per_second=1.83534Gi/s
items_per_second=985.339M/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
1370 ns 1372 ns 508348 bytes_per_second=10.9904Gi/s
items_per_second=5.90044G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
1366 ns 1368 ns 507420 bytes_per_second=11.024Gi/s
items_per_second=5.91848G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
1367 ns 1369 ns 510455 bytes_per_second=11.0135Gi/s
items_per_second=5.91285G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1377 ns 1379 ns 507504 bytes_per_second=10.9347Gi/s
items_per_second=5.87051G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
1367 ns 1369 ns 511657 bytes_per_second=11.0171Gi/s
items_per_second=5.91476G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1332 ns 1333 ns 524574 bytes_per_second=11.3119Gi/s
items_per_second=6.07305G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
1373 ns 1374 ns 510605 bytes_per_second=10.9713Gi/s
items_per_second=5.89016G/s
```
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