pitrou commented on PR #51286:
URL: https://github.com/apache/arrow/pull/51286#issuecomment-6264382169
> The test results show a 15% regression for `ChunkCSVStocksExample` on M1;
I considered this significant and attempted to reproduce it in my local
environment (M5 Pro), but was unsuccessful.
I get a bunch of significant regressions locally as well (AMD Zen 2):
```
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Regressions: (5)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
benchmark baseline contender change %
counters
ChunkCSVStocksExample 2.811 GiB/sec 2.539 GiB/sec -9.664
{'family_index': 5, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVStocksExample', 'repetitions': 1, 'repetition_index': 0, 'threads': 1,
'iterations': 382}
ChunkCSVFlightsExample 970.319 MiB/sec 854.058 MiB/sec -11.982
{'family_index': 3, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVFlightsExample', 'repetitions': 1, 'repetition_index': 0, 'threads':
1, 'iterations': 335}
ChunkCSVEscapedBlock 1.550 GiB/sec 1.306 GiB/sec -15.778
{'family_index': 1, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVEscapedBlock', 'repetitions': 1, 'repetition_index': 0, 'threads': 1,
'iterations': 2630}
ChunkCSVQuotedBlock 1.486 GiB/sec 1.104 GiB/sec -25.710
{'family_index': 0, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVQuotedBlock', 'repetitions': 1, 'repetition_index': 0, 'threads': 1,
'iterations': 2645}
```
That said, this is all when `newlines_in_values` is enabled, which isn't a
very common case.
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