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[CUDA] Decrease launch bounds of CTCLoss backward for blackwell by eqy · Pull Request #159522 · pytorch/pytorch · GitHub
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[CUDA] Decrease launch bounds of CTCLoss backward for blackwell #159522

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[CUDA] Decrease launch bounds of CTCLoss backward for blackwell #159522

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@eqy eqy commented Jul 30, 2025

Otherwise we see CUDA error: too many resources requested for launch

@eqy eqy requested a review from syed-ahmed as a code owner July 30, 2025 22:42
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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/159522

Note: Links to docs will display an error until the docs builds have been completed.

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✅ You can merge normally! (1 Unrelated Failure)

As of commit f199ba5 with merge base 908c5cc (image):

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

  • pull / linux-jammy-py3_9-clang9-xla / test (xla, 1, 1, linux.12xlarge, unstable) (gh) (#158876)
    /var/lib/jenkins/workspace/xla/torch_xla/csrc/runtime/BUILD:476:14: Compiling torch_xla/csrc/runtime/xla_util_test.cpp failed: (Exit 1): gcc failed: error executing CppCompile command (from target //torch_xla/csrc/runtime:xla_util_test) /usr/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer -g0 -O2 '-D_FORTIFY_SOURCE=1' -DNDEBUG -ffunction-sections ... (remaining 229 arguments skipped)

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@pytorch-bot pytorch-bot bot added the release notes: cuda release notes category label Jul 30, 2025
@janeyx99 janeyx99 added the triaged This issue has been looked at a team member, and triaged and prioritized into an appropriate module label Aug 4, 2025
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janeyx99 approved these changes Aug 4, 2025
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lol ok, i trust

@eqy eqy added the ciflow/trunk Trigger trunk jobs on your pull request label Aug 5, 2025
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eqy commented Aug 5, 2025

@pytorchmergebot rebase

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@pytorchbot started a rebase job onto refs/remotes/origin/viable/strict. Check the current status here

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Successfully rebased ctcbackward onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout ctcbackward && git pull --rebase)

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eqy commented Aug 5, 2025

@pytorchmergebot merge

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Merge started

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markc-614 pushed a commit to markc-614/pytorch that referenced this pull request Sep 17, 2025
@eqy @markc-614
[CUDA] Decrease launch bounds of CTCLoss backward for blackwell (pyto…
c82b6d4 
…rch#159522)

Otherwise we see `CUDA error: too many resources requested for launch`
Pull Request resolved: pytorch#159522
Approved by: https://github.com/janeyx99
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@janeyx99 janeyx99 janeyx99 approved these changes

@syed-ahmed syed-ahmed Awaiting requested review from syed-ahmed syed-ahmed is a code owner

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