ARROW-12597: [C++] Enable per-row-group parallelism in async Parquet reader #10482
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Not much difference in a benchmark; the most pronounced change is when files << cores (this was a 4 vcpu machine), which I think makes sense since with many files, file-level parallelism takes hold. |
pitrou
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Jun 10, 2021
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Rebased, can merge if green. |
sjperkins
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Jun 23, 2021
…reader This adds an OptionalParallelForAsync which lets us have per-row-group parallelism without nested parallelism in the async Parquet reader. This also uses TransferAlways, taking care of ARROW-12916. `enable_parallel_column_conversion` is kept as it still affects the threaded scanner. Closes apache#10482 from lidavidm/arrow-12597 Authored-by: David Li <li.davidm96@gmail.com> Signed-off-by: David Li <li.davidm96@gmail.com>
This was referenced Jun 15, 2021
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This adds an OptionalParallelForAsync which lets us have per-row-group parallelism without nested parallelism in the async Parquet reader. This also uses TransferAlways, taking care of ARROW-12916.
enable_parallel_column_conversionis kept as it still affects the threaded scanner.