pitrou commented on PR #39705:
URL: https://github.com/apache/arrow/pull/39705#issuecomment-1921637432
FTR, benchmark numbers here:
```
--------------------------------------------------------------------------------------------------------------------------------------------
Benchmark
Time CPU Iterations UserCounters...
--------------------------------------------------------------------------------------------------------------------------------------------
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
2487 ns 2488 ns 288334 bytes_per_second=6.06116Gi/s
items_per_second=3.25406G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
8071 ns 8072 ns 86861 bytes_per_second=1.86809Gi/s
items_per_second=1.00292G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
826 ns 828 ns 841216 bytes_per_second=18.2145Gi/s
items_per_second=9.77881G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
2209 ns 2211 ns 314019 bytes_per_second=6.81903Gi/s
items_per_second=3.66094G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
2110 ns 2112 ns 331250 bytes_per_second=7.13955Gi/s
items_per_second=3.83302G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1904 ns 1906 ns 368359 bytes_per_second=7.91382Gi/s
items_per_second=4.2487G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
7673 ns 7675 ns 90873 bytes_per_second=1.96488Gi/s
items_per_second=1.05489G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
1338 ns 1342 ns 522900 bytes_per_second=11.2397Gi/s
items_per_second=6.03429G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
1342 ns 1345 ns 521761 bytes_per_second=11.2118Gi/s
items_per_second=6.01927G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
1340 ns 1343 ns 520704 bytes_per_second=11.2263Gi/s
items_per_second=6.02705G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1327 ns 1330 ns 526037 bytes_per_second=11.3356Gi/s
items_per_second=6.08578G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
1335 ns 1338 ns 520920 bytes_per_second=11.2687Gi/s
items_per_second=6.04985G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
1327 ns 1329 ns 526969 bytes_per_second=11.3443Gi/s
items_per_second=6.09043G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
1336 ns 1338 ns 522798 bytes_per_second=11.2696Gi/s
items_per_second=6.05033G/s
```
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