pitrou commented on pull request #11841:
URL: https://github.com/apache/arrow/pull/11841#issuecomment-1004068831
The performance seems unfortunately fragile with this approach. Updated
benchmark numbers (again):
```
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Non-regressions: (8)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
benchmark baseline contender change %
counters
ChunkCSVVehiclesExample 1.814 GiB/sec 4.476 GiB/sec 146.729
{'family_index': 4, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVVehiclesExample', 'repetitions': 3, 'repetition_index': 2, 'threads':
1, 'iterations': 112}
ChunkCSVStocksExample 1.606 GiB/sec 2.531 GiB/sec 57.540
{'family_index': 5, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVStocksExample', 'repetitions': 3, 'repetition_index': 0, 'threads': 1,
'iterations': 528}
ParseCSVVehiclesExample 2.643 GiB/sec 2.831 GiB/sec 7.087
{'family_index': 9, 'per_family_instance_index': 0, 'run_name':
'ParseCSVVehiclesExample', 'repetitions': 3, 'repetition_index': 1, 'threads':
1, 'iterations': 161}
ParseCSVEscapedBlock 640.080 MiB/sec 658.864 MiB/sec 2.935
{'family_index': 7, 'per_family_instance_index': 0, 'run_name':
'ParseCSVEscapedBlock', 'repetitions': 3, 'repetition_index': 0, 'threads': 1,
'iterations': 3193}
ParseCSVStocksExample 1.264 GiB/sec 1.290 GiB/sec 2.041
{'family_index': 10, 'per_family_instance_index': 0, 'run_name':
'ParseCSVStocksExample', 'repetitions': 3, 'repetition_index': 1, 'threads': 1,
'iterations': 422}
ParseCSVQuotedBlock 830.836 MiB/sec 841.314 MiB/sec 1.261
{'family_index': 6, 'per_family_instance_index': 0, 'run_name':
'ParseCSVQuotedBlock', 'repetitions': 3, 'repetition_index': 1, 'threads': 1,
'iterations': 3601}
ParseCSVFlightsExample 500.956 MiB/sec 488.740 MiB/sec -2.438
{'family_index': 8, 'per_family_instance_index': 0, 'run_name':
'ParseCSVFlightsExample', 'repetitions': 3, 'repetition_index': 0, 'threads':
1, 'iterations': 361}
ChunkCSVNoNewlinesBlock 103.81689 100.649114 -3.051
{'family_index': 2, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVNoNewlinesBlock', 'repetitions': 3, 'repetition_index': 1, 'threads':
1, 'iterations': 6787473}
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Regressions: (3)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
benchmark baseline contender change %
counters
ChunkCSVEscapedBlock 2.050 GiB/sec 1.763 GiB/sec -13.988
{'family_index': 1, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVEscapedBlock', 'repetitions': 3, 'repetition_index': 1, 'threads': 1,
'iterations': 9590}
ChunkCSVQuotedBlock 1.531 GiB/sec 1.112 GiB/sec -27.361
{'family_index': 0, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVQuotedBlock', 'repetitions': 3, 'repetition_index': 0, 'threads': 1,
'iterations': 5129}
ChunkCSVFlightsExample 1.258 GiB/sec 921.435 MiB/sec -28.494
{'family_index': 3, 'per_family_instance_index': 0, 'run_name':
'ChunkCSVFlightsExample', 'repetitions': 3, 'repetition_index': 0, 'threads':
1, 'iterations': 943}
```
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