ci: python 3.13 free threading builds by cpcloud · Pull Request #986 · NVIDIA/cuda-python

cpcloud · 2025-09-18T20:00:07Z

Closes#132. Add CI wheel builds and test matrix entries for free-threaded builds.

copy-pr-bot · 2025-09-18T20:00:10Z

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cpcloud · 2025-09-18T20:34:00Z

/ok to test

cpcloud · 2025-09-18T20:52:33Z

/ok to test

cpcloud · 2025-09-18T21:12:35Z

/ok to test

leofang · 2025-09-19T01:03:07Z

This requires cuda-bindings 12.9.x to be rebuilt and merged first

Ok, what needs to happen for that?

Have a backport version of this PR merged first, as implied by our new shiny CI doc we fetch the 12.x wheels from the 12.9.x branch.

Ok, I'll leave it out for now then.

cpcloud · 2025-09-19T13:43:21Z

/ok to test

cpcloud · 2025-09-19T14:05:26Z

Looks like I am probably missing a comma in some JSON. That's what I get for copypasta-ing!

cpcloud · 2025-09-19T14:24:26Z

/ok to test

…threading build wheel

cpcloud · 2025-09-19T16:13:47Z

Tests are currently not able to run because test-cu13 cannot be installed, because there's no cupy package available for free-threading builds.

Unfortunately there's also no way to get that metadata at build time (see https://packaging.python.org/en/latest/specifications/dependency-specifiers/#dependency-specifiers for what's available. I tried them all, and saw nothing that indicated whether a build was a FT build).

I'll have to come up with a WAR to skip installation of that dependency.

…testing the FT builds

cpcloud · 2025-09-19T16:25:23Z

/ok to test

cpcloud · 2025-09-19T17:31:29Z

Ah, I need to edit the build matrix I think.

cpcloud · 2025-09-19T17:33:13Z

/ok to test

leofang · 2025-09-19T18:45:16Z

Thanks, Phillip! Code-wise LGTM! A few questions on the next steps you have in mind:

Need a release note entry for each project, maybe you wanna take care of it with Document about the free-threading (cp313t) build #134 either now or later?
Need to flip PTDS default (RFC: Enable per-thread default stream in free-threading builds #133). It can be done in a separate PR but must be done before we cut a release.

cpcloud · 2025-09-19T18:47:45Z

Will do each of those in a separate PR!

leofang

Sounds good, thanks! We also need to backport this.

cpcloud · 2025-09-19T18:52:38Z

Ok, I will get started on the backport then. Merging.

github-actions · 2025-09-19T19:06:14Z

Doc Preview CI
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* backport PR #986 * backport PR #1005

leofang reviewed Sep 19, 2025
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Comment threadcuda_bindings/pyproject.toml Outdated

leofang assigned cpcloud Sep 19, 2025

leofang added P0 High priority - Must do! CI/CD CI/CD infrastructure packaging Anything related to wheels or Conda packages cuda.bindings Everything related to the cuda.bindings module cuda.core Everything related to the cuda.core module labels Sep 19, 2025

leofang added this to the cuda.core beta 7 milestone Sep 19, 2025

cpcloud force-pushed the free-threading-builds branch from b2a70a7 to 48ea7d4Compare September 19, 2025 13:22

cpcloud changed the title ~~free threading builds~~ci(python): free threading buildsSep 19, 2025

cpcloud changed the title ~~ci(python): free threading builds~~ci: free threading buildsSep 19, 2025

cpcloud changed the title ~~ci: free threading builds~~ci: python 3.13 free threading buildsSep 19, 2025

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leofang reviewed Sep 19, 2025
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Comment threadci/test-matrix.json Outdated

cpcloud mentioned this pull request Sep 19, 2025
ci: move cibuildwheel config out of github actions workflows and into pyproject.tomls #994
Merged

cpcloud added 4 commits September 19, 2025 11:00

ci: build free-threaded wheels
8c902df

build(deps): bump cython lower bound
99ccb1f

ci: enable freethreading for 3.13 in cibuildwheel
8127949

ci: bump cython lower bound in cuda_core
f57ff36

cpcloud added 4 commits September 19, 2025 11:00

ci: skip tests that require llvmlite because it does not ship a free-…
be5c2bb
…threading build wheel

ci: remove filtering out of cuda-bindings artifacts
013b588

ci: remove redundant environment variable setting
3310ebf

ci: fix syntax errors in ci/test-matrix.json
1cffc26

ci: add optional dependency group to avoid installation of cupy when …
96ee1c2
…testing the FT builds

cpcloud force-pushed the free-threading-builds branch from de5815a to 96ee1c2Compare September 19, 2025 16:25

ci: remove 12.9.x from builds for now
86fc8f4

cpcloud requested a review from leofang September 19, 2025 18:40

leofang approved these changes Sep 19, 2025
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cpcloud merged commit c4f4ffe into NVIDIA:mainSep 19, 2025
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cpcloud deleted the free-threading-builds branch September 19, 2025 18:52

cpcloud mentioned this pull request Sep 19, 2025
ci: python 3.13 free threading builds (#986) #998
Closed

rwgk mentioned this pull request Sep 19, 2025
ci: remove spurious free-threading builds #999
Merged

leofang added a commit to leofang/cuda-python that referenced this pull request Sep 29, 2025
backport PRNVIDIA#986
933ae57

cpcloud pushed a commit that referenced this pull request Sep 29, 2025
Backport#986&#1005(#1042)
41420f9
* backport PR #986 * backport PR #1005

cpcloud mentioned this pull request Oct 8, 2025
backport ft fix #1111
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