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Tighten Parquet page config in benchmarks so requested page layout is produced - #24191
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This was referenced Sep 16, 2026
Pure rename: the shared benchmark helper file now also needs to hold Parquet file writers, not just the reader driver, so the reader-specific name no longer fits. No functional change.
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Benchmark resultsMachine: NVIDIA GH200 480GB (132-SM Hopper, Neoverse-V2 CPU), driver 580.95.05, CUDA 13.3. All runs with
Before/after:
|
| num_rows | row groups | pages/rg | requested rows/page | before rows/page | before pages/rg | after rows/page | after pages/rg |
|---|---|---|---|---|---|---|---|
| 10M | 1 | 1,000 | 10,000 | 10,000 | 1,000 | 10,000 | 1,000 |
| 10M | 1 | 10,000 | 1,000 | 5,000 | 2,000 | 1,000 | 10,000 |
| 10M | 10 | 1,000 | 1,000 | 5,000 | 200 | 1,000 | 1,000 |
| 10M | 10 | 10,000 | 100 | 5,000 | 200 | 100 | 10,000 |
| 100M | 1 | 1,000 | 100,000 | 25,000 | 4,000 | 100,000 | 1,000 |
| 100M | 1 | 10,000 | 10,000 | 10,000 | 10,000 | 10,000 | 10,000 |
| 100M | 10 | 1,000 | 10,000 | 10,000 | 1,000 | 10,000 | 1,000 |
| 100M | 10 | 10,000 | 1,000 | 5,000 | 2,000 | 1,000 | 10,000 |
Two failure modes: requests below 5,000 rows/page get exactly 5,000 (worst case asks 100, gets 5,000); requests above ~25,000 rows/page get 25,000 (512 KiB / ~20.5 bytes per row, rounded down to whole fragments).
Timing impact
GPU time, base vs PR, all 16 cells:
| num_rows | row groups | requested pages/rg | page index | pages before → after | base | PR | Δ |
|---|---|---|---|---|---|---|---|
| 10M | 1 | 1k | yes | 1,000 (same) | 4.327 ms | 4.311 ms | −0.4% |
| 10M | 1 | 1k | no | 1,000 (same) | 11.123 ms | 11.129 ms | +0.1% |
| 10M | 1 | 10k | yes | 2,000 → 10,000 | 3.659 ms | 5.369 ms | +47% |
| 10M | 1 | 10k | no | 2,000 → 10,000 | 17.179 ms | 73.854 ms | +330% |
| 10M | 10 | 1k | yes | 2,000 → 10,000 | 3.578 ms | 6.255 ms | +75% |
| 10M | 10 | 1k | no | 2,000 → 10,000 | 4.635 ms | 10.971 ms | +137% |
| 10M | 10 | 10k | yes | 2,000 → 100,000 | 3.595 ms | 29.902 ms | +732% |
| 10M | 10 | 10k | no | 2,000 → 100,000 | 4.638 ms | 84.132 ms | +1714% |
| 100M | 1 | 1k | yes | 4,000 → 1,000 | 20.656 ms | 30.833 ms | +49% |
| 100M | 1 | 1k | no | 4,000 → 1,000 | 48.681 ms | 37.936 ms | −22% |
| 100M | 1 | 10k | yes | 10,000 (same) | 20.390 ms | 20.385 ms | −0.0% |
| 100M | 1 | 10k | no | 10,000 (same) | 90.813 ms | 90.792 ms | −0.0% |
| 100M | 10 | 1k | yes | 10,000 (same) | 21.208 ms | 21.240 ms | +0.2% |
| 100M | 10 | 1k | no | 10,000 (same) | 26.426 ms | 26.438 ms | +0.05% |
| 100M | 10 | 10k | yes | 20,000 → 100,000 | 23.126 ms | 43.382 ms | +88% |
| 100M | 10 | 10k | no | 20,000 → 100,000 | 34.232 ms | 101.336 ms | +196% |
Raw nvbench output — base (main), parquet_read_file_shape
| io_type | num_rows | num_row_groups | pages_per_row_group | has_page_idx | Samples | CPU Time | Noise | GPU Time | Noise | rows_per_sec | peak_memory_usage | encoded_file_size |
|---------------|-----------|----------------|---------------------|--------------|---------|-----------|-------|-----------|-------|--------------|-------------------|-------------------|
| DEVICE_BUFFER | 10000000 | 1 | 1000 | 1 | 1264x | 4.343 ms | 0.62% | 4.327 ms | 0.61% | 2310898191 | 424.683 MiB | 187.667 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 1000 | 1 | 25x | 20.674 ms | 0.17% | 20.656 ms | 0.17% | 4841162164 | 4.146 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 1000 | 1 | 928x | 3.601 ms | 0.61% | 3.578 ms | 0.59% | 2794943762 | 425.013 MiB | 187.733 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 1000 | 1 | 24x | 21.227 ms | 0.22% | 21.208 ms | 0.22% | 4715240006 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 1 | 10000 | 1 | 137x | 3.676 ms | 0.46% | 3.659 ms | 0.46% | 2732640153 | 425.011 MiB | 187.734 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 10000 | 1 | 25x | 20.409 ms | 0.16% | 20.390 ms | 0.16% | 4904363838 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 10000 | 1 | 303x | 3.614 ms | 0.52% | 3.595 ms | 0.50% | 2781332905 | 425.013 MiB | 187.733 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 10000 | 1 | 22x | 23.146 ms | 0.36% | 23.126 ms | 0.36% | 4324175954 | 4.151 GiB | 1.834 GiB |
| DEVICE_BUFFER | 10000000 | 1 | 1000 | 0 | 45x | 11.138 ms | 0.23% | 11.123 ms | 0.23% | 899068305 | 424.683 MiB | 187.625 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 1000 | 0 | 11x | 48.698 ms | 0.11% | 48.681 ms | 0.11% | 2054206548 | 4.146 GiB | 1.832 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 1000 | 0 | 108x | 4.651 ms | 0.30% | 4.635 ms | 0.30% | 2157641164 | 425.013 MiB | 187.652 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 1000 | 0 | 19x | 26.444 ms | 0.12% | 26.426 ms | 0.11% | 3784098813 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 1 | 10000 | 0 | 30x | 17.195 ms | 0.18% | 17.179 ms | 0.18% | 582094175 | 425.011 MiB | 187.651 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 10000 | 0 | 6x | 90.831 ms | 0.11% | 90.813 ms | 0.11% | 1101166493 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 10000 | 0 | 108x | 4.654 ms | 0.33% | 4.638 ms | 0.33% | 2156091572 | 425.013 MiB | 187.652 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 10000 | 0 | 15x | 34.250 ms | 0.22% | 34.232 ms | 0.22% | 2921207236 | 4.151 GiB | 1.833 GiB |
Raw nvbench output — PR branch, parquet_read_file_shape
| io_type | num_rows | num_row_groups | pages_per_row_group | has_page_idx | Samples | CPU Time | Noise | GPU Time | Noise | rows_per_sec | peak_memory_usage | encoded_file_size |
|---------------|-----------|----------------|---------------------|--------------|---------|------------|-------|------------|-------|--------------|-------------------|-------------------|
| DEVICE_BUFFER | 10000000 | 1 | 1000 | 1 | 116x | 4.327 ms | 0.42% | 4.311 ms | 0.42% | 2319471238 | 424.683 MiB | 187.667 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 1000 | 1 | 17x | 30.850 ms | 0.12% | 30.833 ms | 0.12% | 3243298137 | 4.145 GiB | 1.832 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 1000 | 1 | 816x | 6.275 ms | 0.79% | 6.255 ms | 0.79% | 1598719040 | 427.651 MiB | 188.352 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 1000 | 1 | 46x | 21.268 ms | 0.51% | 21.240 ms | 0.50% | 4708064018 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 1 | 10000 | 1 | 416x | 5.387 ms | 0.73% | 5.369 ms | 0.73% | 1862664383 | 427.649 MiB | 188.360 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 10000 | 1 | 25x | 20.403 ms | 0.23% | 20.385 ms | 0.23% | 4905622091 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 10000 | 1 | 501x | 29.924 ms | 0.77% | 29.902 ms | 0.77% | 334424059 | 457.131 MiB | 195.235 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 10000 | 1 | 30x | 43.403 ms | 0.49% | 43.382 ms | 0.49% | 2305129959 | 4.177 GiB | 1.840 GiB |
| DEVICE_BUFFER | 10000000 | 1 | 1000 | 0 | 45x | 11.145 ms | 0.25% | 11.129 ms | 0.25% | 898524239 | 424.683 MiB | 187.625 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 1000 | 0 | 14x | 37.952 ms | 0.10% | 37.936 ms | 0.10% | 2636017610 | 4.145 GiB | 1.832 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 1000 | 0 | 46x | 10.988 ms | 0.36% | 10.971 ms | 0.36% | 911483217 | 427.651 MiB | 187.871 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 1000 | 0 | 19x | 26.456 ms | 0.18% | 26.438 ms | 0.18% | 3782375199 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 1 | 10000 | 0 | 7x | 73.872 ms | 0.14% | 73.854 ms | 0.14% | 135401629 | 427.649 MiB | 187.870 MiB |
| DEVICE_BUFFER | 100000000 | 1 | 10000 | 0 | 6x | 90.810 ms | 0.16% | 90.792 ms | 0.16% | 1101422393 | 4.148 GiB | 1.833 GiB |
| DEVICE_BUFFER | 10000000 | 10 | 10000 | 0 | 6x | 84.151 ms | 0.18% | 84.132 ms | 0.18% | 118860981 | 457.131 MiB | 190.143 MiB |
| DEVICE_BUFFER | 100000000 | 10 | 10000 | 0 | 5x | 101.356 ms | 0.09% | 101.336 ms | 0.09% | 986811707 | 4.177 GiB | 1.835 GiB |
3 tasks done
Moves the writer inlined in BM_parquet_read_file_shape into write_file_shape_parquet_file so other benchmarks can request the same row group and page layout instead of copying the writer setup. Behavior preserving: the file written is byte-identical.
Pins max_page_fragment_size and lifts max_page_size_bytes. Pages are assembled out of whole fragments, so the default 5000-row fragment acted as a floor on page size and the default 512KB limit closed pages early, which meant the requested pages_per_row_group was silently not honored: only 3 of the 8 shape configs got the layout they asked for, and the worst case requested 100 rows per page and got 5000. This changes the page layout parquet_read_file_shape generates, so its numbers are not comparable with previous runs.
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| state.add_buffer_size(source_sink.size(), "encoded_file_size", "encoded_file_size"); | ||
| } | ||
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| cuio_source_sink_pair write_file_shape_parquet_file(cudf::type_id dtype, |
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Together with BM_parquet_read_file_shape, this function also needed by BM_hybrid_scan_file_shape in #24192. So move it to its final home in advance
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| .compression(cudf::io::compression_type::NONE) | ||
| .row_group_size_rows(num_rows / num_row_groups) | ||
| .max_page_size_rows(rows_per_page) | ||
| // Pages are assembled out of whole fragments, so without this the default 5000-row |
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Same problem as
cudf/cpp/tests/io/parquet_reader_dict_test.cpp
Lines 103 to 110 in 315a84f
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. 📝 SummarySummary by CodeRabbit
WalkthroughParquet reader benchmarks now use a shared helper to generate configurable input files. Benchmark targets compile the shared implementation, and the file-shape strings benchmark delegates input creation to it. ChangesParquet benchmark helper
Estimated code review effort: 2 (Simple) | ~10 minutes Possibly related PRs
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Inline comments:
In `@cpp/benchmarks/io/parquet/parquet_common.cpp`:
- Line 47: Extend coverage for write_file_shape_parquet_file and
BM_parquet_read_file_shape to inspect row-group metadata and page headers,
verifying the combined row-group, fragment, and page-byte configuration. Add
focused cases with fewer than 5,000 rows per fragment and with pages exceeding
the default 512 KiB limit, while preserving existing row and column assertions.
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looks good, just a few small comments.
| data_profile_builder().cardinality(num_rows / 10).avg_run_length(4)); | ||
| auto const view = tbl->view(); | ||
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| auto const rows_per_page = num_rows / (num_row_groups * pages_per_row_group); |
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Worth adding an explicit check here?
Suggested change
| auto const rows_per_page = num_rows / (num_row_groups * pages_per_row_group); | |
| auto const rows_per_page = num_rows / (num_row_groups * pages_per_row_group); | |
| CUDF_EXPECTS(rows_per_page > 0, | |
| "num_row_groups * pages_per_row_group must not exceed num_rows"); |
| .max_page_fragment_size(rows_per_page) | ||
| // Lift the default 512KB page limit so that it does not close pages before | ||
| // `max_page_size_rows` does | ||
| .max_page_size_bytes(1ul << 30) |
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1ul is a type mismatch with the size_t parameter, and 1 GiB is an arbitrary stand-in for what the comment above actually says: bytes should never be what closes a page. set_max_page_size_bytes accepts up to int32_t::max, so could this state the intent directly?
Suggested change
| .max_page_size_bytes(1ul << 30) | |
| .max_page_size_bytes(static_cast<size_t>(std::numeric_limits<int32_t>::max())) |
…age size limits. Introduce a check to ensure that the number of rows per page is greater than zero, preventing potential runtime errors. Update the maximum page size to the largest possible value for better performance during writes.
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Approved trivial CMake changes
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Description
Split out of #24162.
This PR is the shared groundwork that #24192 and #24193 build on. It also sets
max_page_fragment_sizeand raisesmax_page_size_bytesto ensure benchmarkparquet_read_file_shapecan actually generate requested Parquet shape.Checklist