Use cuda::stream_ref in libcudf_streaming by vyasr · Pull Request #23727 · NVIDIA/cudf

vyasr · 2026-08-19T18:41:30Z

Description

This split batch migrates libcudf_streaming APIs, tests, benchmarks, examples, and Python streaming bindings from rmm::cuda_stream_view to cuda::stream_ref.

This is separated from the core libcudf C++ stream_ref migration in #23691.

Contributes to #23636

Checklist

I am familiar with the Contributing Guidelines.
New or existing tests cover these changes.
The documentation is up to date with these changes.

copy-pr-bot · 2026-08-19T18:41:34Z

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📥 Commits

Reviewing files that changed from the base of the PR and between 45d262a and ea7ea66.

📒 Files selected for processing (42)

cpp/libcudf_streaming/benchmarks/bench_pack.cpp
cpp/libcudf_streaming/benchmarks/bench_partition.cpp
cpp/libcudf_streaming/benchmarks/bench_shuffle.cpp
cpp/libcudf_streaming/benchmarks/streaming/bench_streaming_shuffle.cpp
cpp/libcudf_streaming/benchmarks/streaming/data_generator.hpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/concatenate.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/join.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/parquet_writer.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/q03.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/utils.hpp
cpp/libcudf_streaming/benchmarks/utils/random_data.cu
cpp/libcudf_streaming/benchmarks/utils/random_data.hpp
cpp/libcudf_streaming/examples/example_shuffle.cpp
cpp/libcudf_streaming/include/cudf_streaming/detail/approx_distinct_count.hpp
cpp/libcudf_streaming/include/cudf_streaming/detail/device_bloom_filter.hpp
cpp/libcudf_streaming/include/cudf_streaming/detail/stream_adapter.hpp
cpp/libcudf_streaming/include/cudf_streaming/parquet.hpp
cpp/libcudf_streaming/include/cudf_streaming/partition_utils.hpp
cpp/libcudf_streaming/include/cudf_streaming/table_chunk.hpp
cpp/libcudf_streaming/include/cudf_streaming/utils.hpp
cpp/libcudf_streaming/src/approx_distinct_count.cpp
cpp/libcudf_streaming/src/bloom_filter.cpp
cpp/libcudf_streaming/src/channel_metadata.cpp
cpp/libcudf_streaming/src/detail/approx_distinct_count.cu
cpp/libcudf_streaming/src/detail/device_bloom_filter.cu
cpp/libcudf_streaming/src/parquet.cpp
cpp/libcudf_streaming/src/partition_utils.cpp
cpp/libcudf_streaming/src/table_chunk.cpp
cpp/libcudf_streaming/src/utils.cpp
cpp/libcudf_streaming/tests/streaming/base_streaming_fixture.hpp
cpp/libcudf_streaming/tests/streaming/test_channel_metadata.cpp
cpp/libcudf_streaming/tests/streaming/test_cudf_utils.cpp
cpp/libcudf_streaming/tests/streaming/test_read_parquet.cpp
cpp/libcudf_streaming/tests/streaming/test_table_chunk.cpp
cpp/libcudf_streaming/tests/test_shuffler.cpp
cpp/libcudf_streaming/tests/utils.hpp
python/cudf_streaming/cudf_streaming/channel_metadata.pxd
python/cudf_streaming/cudf_streaming/channel_metadata.pyx
python/cudf_streaming/cudf_streaming/partition_utils.pyx
python/cudf_streaming/cudf_streaming/stream_ref.pxd
python/cudf_streaming/cudf_streaming/table_chunk.pxd
python/cudf_streaming/cudf_streaming/table_chunk.pyx

💤 Files with no reviewable changes (1)

python/cudf_streaming/cudf_streaming/channel_metadata.pxd

🚧 Files skipped from review as they are similar to previous changes (41)

python/cudf_streaming/cudf_streaming/channel_metadata.pyx
cpp/libcudf_streaming/tests/streaming/test_cudf_utils.cpp
cpp/libcudf_streaming/benchmarks/streaming/bench_streaming_shuffle.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/concatenate.cpp
cpp/libcudf_streaming/src/channel_metadata.cpp
cpp/libcudf_streaming/tests/streaming/base_streaming_fixture.hpp
cpp/libcudf_streaming/tests/test_shuffler.cpp
cpp/libcudf_streaming/benchmarks/bench_partition.cpp
cpp/libcudf_streaming/src/bloom_filter.cpp
cpp/libcudf_streaming/tests/streaming/test_channel_metadata.cpp
cpp/libcudf_streaming/include/cudf_streaming/detail/approx_distinct_count.hpp
python/cudf_streaming/cudf_streaming/table_chunk.pxd
cpp/libcudf_streaming/include/cudf_streaming/parquet.hpp
cpp/libcudf_streaming/benchmarks/utils/random_data.hpp
cpp/libcudf_streaming/benchmarks/streaming/data_generator.hpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/utils.hpp
python/cudf_streaming/cudf_streaming/stream_ref.pxd
cpp/libcudf_streaming/examples/example_shuffle.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/parquet_writer.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/q03.cpp
cpp/libcudf_streaming/benchmarks/utils/random_data.cu
cpp/libcudf_streaming/benchmarks/streaming/ndsh/join.cpp
cpp/libcudf_streaming/tests/streaming/test_read_parquet.cpp
cpp/libcudf_streaming/src/detail/approx_distinct_count.cu
cpp/libcudf_streaming/include/cudf_streaming/utils.hpp
cpp/libcudf_streaming/include/cudf_streaming/partition_utils.hpp
cpp/libcudf_streaming/tests/streaming/test_table_chunk.cpp
python/cudf_streaming/cudf_streaming/partition_utils.pyx
cpp/libcudf_streaming/src/table_chunk.cpp
cpp/libcudf_streaming/include/cudf_streaming/detail/stream_adapter.hpp
cpp/libcudf_streaming/src/parquet.cpp
cpp/libcudf_streaming/tests/utils.hpp
cpp/libcudf_streaming/benchmarks/bench_shuffle.cpp
cpp/libcudf_streaming/src/detail/device_bloom_filter.cu
cpp/libcudf_streaming/src/approx_distinct_count.cpp
cpp/libcudf_streaming/src/partition_utils.cpp
cpp/libcudf_streaming/include/cudf_streaming/table_chunk.hpp
python/cudf_streaming/cudf_streaming/table_chunk.pyx
cpp/libcudf_streaming/src/utils.cpp
cpp/libcudf_streaming/benchmarks/bench_pack.cpp
cpp/libcudf_streaming/include/cudf_streaming/detail/device_bloom_filter.hpp

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📝 Walkthrough

Summary by CodeRabbit

Refactor
- Standardized CUDA stream handling across streaming operations, examples, benchmarks, and utilities.
- Improved stream interoperability and synchronization across streaming workflows.
- Added consistent support for connecting and coordinating CUDA streams.
Compatibility
- Python-facing APIs remain unchanged.
- Updated public C++ interfaces to use the standardized CUDA stream representation.
Tests
- Updated streaming tests and benchmarks to verify consistent CUDA stream behavior.

Walkthrough

Changes

The PR migrates libcudf streaming APIs, implementations, benchmarks, Python bindings, and tests from rmm::cuda_stream_view to cuda::stream_ref. It adds stream adapters for RMM interoperability and updates synchronization and native stream-handle access.

CUDA stream migration

Layer / File(s)	Summary
Stream conversion and join adapter `cpp/libcudf_streaming/include/cudf_streaming/detail/stream_adapter.hpp`	Adds conversions between CUDA and RMM stream types and adapters for individual and ranged stream joins.
C++ API and implementation migration `cpp/libcudf_streaming/include/cudf_streaming/`, `cpp/libcudf_streaming/src/`	Updates stream parameters, stored stream values, callbacks, kernel launches, and stream-join call sites.
Python stream bindings `python/cudf_streaming/cudf_streaming/*`	Declares `cuda::stream_ref` in Cython and converts Python stream handles for partition and table-chunk operations.
Benchmark stream migration `cpp/libcudf_streaming/benchmarks/`, `cpp/libcudf_streaming/examples/`	Updates benchmark stream types, default streams, synchronization, and stream-join usage.
Test stream migration `cpp/libcudf_streaming/tests/*`	Updates fixtures, callbacks, synchronization, stream conversions, and stream identity assertions.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to ea7ea

This PR updates streaming APIs and their callers to use cuda::stream_ref without any identified merge-blocking correctness, runtime, or integration risk; it is merge-ready after normal checks and review.

Suggested reviewers: tomaugspurger

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 24.42% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 86 functions across 36 files. (5 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: migrating libcudf_streaming to cuda::stream_ref.
Description check	✅ Passed	The description directly explains the migration across libcudf_streaming APIs, tests, benchmarks, examples, and Python bindings.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 24.42% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 86 functions across 36 files. (5 skipped: 5 unsupported.)

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Actionable comments posted: 2

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Inline comments:
In `@cpp/libcudf_streaming/benchmarks/bench_partition.cpp`:
- Line 48: Update the stream initialization at both benchmark locations to use
cudf::get_default_stream() instead of constructing cuda::stream_ref from
cudaStreamLegacy, preserving the configured default-stream behavior required by
the benchmark.

In `@cpp/libcudf_streaming/tests/streaming/test_channel_metadata.cpp`:
- Line 164: In the test using the cuda::stream_ref variable stream, replace the
stream.synchronize() call with stream.sync() so the target compiles with the
supported API.

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📥 Commits

Reviewing files that changed from the base of the PR and between e36fd8a and b531833.

📒 Files selected for processing (42)

cpp/libcudf_streaming/benchmarks/bench_pack.cpp
cpp/libcudf_streaming/benchmarks/bench_partition.cpp
cpp/libcudf_streaming/benchmarks/bench_shuffle.cpp
cpp/libcudf_streaming/benchmarks/streaming/bench_streaming_shuffle.cpp
cpp/libcudf_streaming/benchmarks/streaming/data_generator.hpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/concatenate.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/join.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/parquet_writer.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/q03.cpp
cpp/libcudf_streaming/benchmarks/streaming/ndsh/utils.hpp
cpp/libcudf_streaming/benchmarks/utils/random_data.cu
cpp/libcudf_streaming/benchmarks/utils/random_data.hpp
cpp/libcudf_streaming/examples/example_shuffle.cpp
cpp/libcudf_streaming/include/cudf_streaming/detail/approx_distinct_count.hpp
cpp/libcudf_streaming/include/cudf_streaming/detail/device_bloom_filter.hpp
cpp/libcudf_streaming/include/cudf_streaming/detail/stream_adapter.hpp
cpp/libcudf_streaming/include/cudf_streaming/parquet.hpp
cpp/libcudf_streaming/include/cudf_streaming/partition_utils.hpp
cpp/libcudf_streaming/include/cudf_streaming/table_chunk.hpp
cpp/libcudf_streaming/include/cudf_streaming/utils.hpp
cpp/libcudf_streaming/src/approx_distinct_count.cpp
cpp/libcudf_streaming/src/bloom_filter.cpp
cpp/libcudf_streaming/src/channel_metadata.cpp
cpp/libcudf_streaming/src/detail/approx_distinct_count.cu
cpp/libcudf_streaming/src/detail/device_bloom_filter.cu
cpp/libcudf_streaming/src/parquet.cpp
cpp/libcudf_streaming/src/partition_utils.cpp
cpp/libcudf_streaming/src/table_chunk.cpp
cpp/libcudf_streaming/src/utils.cpp
cpp/libcudf_streaming/tests/streaming/base_streaming_fixture.hpp
cpp/libcudf_streaming/tests/streaming/test_channel_metadata.cpp
cpp/libcudf_streaming/tests/streaming/test_cudf_utils.cpp
cpp/libcudf_streaming/tests/streaming/test_read_parquet.cpp
cpp/libcudf_streaming/tests/streaming/test_table_chunk.cpp
cpp/libcudf_streaming/tests/test_shuffler.cpp
cpp/libcudf_streaming/tests/utils.hpp
python/cudf_streaming/cudf_streaming/channel_metadata.pxd
python/cudf_streaming/cudf_streaming/channel_metadata.pyx
python/cudf_streaming/cudf_streaming/partition_utils.pyx
python/cudf_streaming/cudf_streaming/stream_ref.pxd
python/cudf_streaming/cudf_streaming/table_chunk.pxd
python/cudf_streaming/cudf_streaming/table_chunk.pyx

💤 Files with no reviewable changes (1)

python/cudf_streaming/cudf_streaming/channel_metadata.pxd

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…ef-batch-5-streaming

nirandaperera

I feel that we should fix rapidsmpf stream_refs first before adopting these changes.

vyasr · 2026-08-26T21:50:09Z

I feel that we should fix rapidsmpf stream_refs first before adopting these changes.

Sure, I can pause on merging this until I get rapidsmpf migrated first. I'll work on that now.

coderabbitai · 2026-08-28T08:34:48Z

Note

GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer.

The RMM stream pool has not yet been migrated to return cuda::stream_ref, so we must explicitly ask for a stream_ref when obtaining fresh streams.

wence- · 2026-08-28T12:46:47Z

/merge

vyasr added libcudf Affects libcudf (C++/CUDA) code. Python Affects Python cuDF API. improvement Improvement / enhancement to an existing function non-breaking Non-breaking change labels Aug 19, 2026

github-project-automation Bot added this to cuDF Python and cuDF Python Aug 19, 2026

github-project-automation Bot moved this to Todo in cuDF Python Aug 19, 2026

github-actions Bot assigned vyasr Aug 19, 2026

github-actions Bot added Java Affects Java cuDF API. pylibcudf Issues specific to the pylibcudf package labels Aug 19, 2026

vyasr removed Java Affects Java cuDF API. pylibcudf Issues specific to the pylibcudf package labels Aug 19, 2026

github-actions Bot added Java Affects Java cuDF API. pylibcudf Issues specific to the pylibcudf package labels Aug 19, 2026

vyasr removed Java Affects Java cuDF API. pylibcudf Issues specific to the pylibcudf package labels Aug 19, 2026

vyasr force-pushed the codex/cuda-stream-ref-batch-5-streaming branch from b4370dd to 15b6107 Compare August 21, 2026 23:50

vyasr added 4 commits August 22, 2026 19:31

Use cuda::stream_ref in libcudf_streaming

e794e75

Address stream_ref streaming review comments

eca1474

Adapt streaming joins for cuda stream_ref

9f1a4ea

Use cuda stream_ref header in libcudf_streaming

b531833

vyasr force-pushed the codex/cuda-stream-ref-batch-5-streaming branch from 15b6107 to b531833 Compare August 23, 2026 02:33

vyasr marked this pull request as ready for review August 23, 2026 02:34

vyasr requested review from a team as code owners August 23, 2026 02:34

vyasr requested a review from TomAugspurger August 23, 2026 02:34

coderabbitai Bot reviewed Aug 23, 2026

View reviewed changes

Comment thread cpp/libcudf_streaming/benchmarks/bench_partition.cpp Outdated

Comment thread cpp/libcudf_streaming/tests/streaming/test_channel_metadata.cpp

Merge upstream/main into stream_ref streaming

93f0ce4

vyasr added 2 commits August 24, 2026 10:15

Fix streaming stream_ref synchronization

808be84

Merge remote-tracking branch 'upstream/main' into codex/cuda-stream-r…

b2f9497

…ef-batch-5-streaming

nirandaperera reviewed Aug 26, 2026

View reviewed changes

Comment thread cpp/libcudf_streaming/benchmarks/bench_partition.cpp Outdated

Comment thread cpp/libcudf_streaming/include/cudf_streaming/detail/stream_adapter.hpp Outdated

bdice reviewed Aug 26, 2026

View reviewed changes

Comment thread cpp/libcudf_streaming/benchmarks/bench_pack.cpp Outdated

Use canonical CUDA streams in libcudf streaming

9029757

github-actions Bot assigned bdice Aug 26, 2026

bdice approved these changes Aug 26, 2026

View reviewed changes

Comment thread cpp/libcudf_streaming/include/cudf_streaming/detail/stream_adapter.hpp Outdated

Merge branch 'main' into codex/cuda-stream-ref-batch-5-streaming

ea7ea66

github-actions Bot assigned wence- Aug 28, 2026

wence- added 2 commits August 28, 2026 08:45

Remove temporary stream adapter now rapidsmpf uses cuda::stream_ref

1a658f5

Use explicit cuda::stream_ref when obtaining stream from stream pool

bae2ece

The RMM stream pool has not yet been migrated to return cuda::stream_ref, so we must explicitly ask for a stream_ref when obtaining fresh streams.

wence- approved these changes Aug 28, 2026

View reviewed changes

Comment thread cpp/libcudf_streaming/benchmarks/streaming/ndsh/concatenate.cpp

wence- mentioned this pull request Aug 28, 2026

Fix list scatter child indexing for sliced inputs #23821

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TomAugspurger approved these changes Aug 28, 2026

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rapids-bot Bot merged commit 64f0a7b into NVIDIA:main Aug 28, 2026
292 of 296 checks passed

github-project-automation Bot moved this from Todo to Done in cuDF Python Aug 28, 2026

vyasr deleted the codex/cuda-stream-ref-batch-5-streaming branch August 28, 2026 15:12

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vyasr commented Aug 19, 2026

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coderabbitai Bot commented Aug 23, 2026 •

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