pitrou commented on PR #50483:
URL: https://github.com/apache/arrow/pull/50483#issuecomment-5036390850
I see massive regressions locally on an AMD Zen 2 CPU:
```
benchmark baseline contender change %
counters
ParseCSVFlightsExample 695.448 MiB/sec 623.760 MiB/sec -10.308
{'family_index': 8, 'per_family_instance_index': 0, 'run_name':
'ParseCSVFlightsExample', 'repetitions': 8, 'repetition_index': 4, 'threads':
1, 'iterations': 199}
ParseCSVStocksExample 2.068 GiB/sec 1.032 GiB/sec -50.091
{'family_index': 10, 'per_family_instance_index': 0, 'run_name':
'ParseCSVStocksExample', 'repetitions': 8, 'repetition_index': 3, 'threads': 1,
'iterations': 286}
ParseCSVVehiclesExample 3.264 GiB/sec 1.613 GiB/sec -50.578
{'family_index': 9, 'per_family_instance_index': 0, 'run_name':
'ParseCSVVehiclesExample', 'repetitions': 8, 'repetition_index': 1, 'threads':
1, 'iterations': 80}
ChunkCSVStocksExample 4.602 GiB/sec 1.299 GiB/sec -71.774
{'family_index': 5, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVStocksExample', 'repetitions': 8, 'repetition_index': 3, 'threads': 1,
'iterations': 660}
ChunkCSVVehiclesExample 7.440 GiB/sec 2.016 GiB/sec -72.908
{'family_index': 4, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVVehiclesExample', 'repetitions': 8, 'repetition_index': 6, 'threads':
1, 'iterations': 186}
```
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