[c10] Move P2P access logic from ATen to c10 by ngimel · Pull Request #174582 · pytorch/pytorch

ngimel · 2026-02-09T06:06:41Z

Stack from ghstack (oldest at bottom):

-> [c10] Move P2P access logic from ATen to c10 #174582

Refactor PeerToPeerAccess by moving the core implementation from
aten/src/ATen/cuda to c10/cuda. This makes P2P and fabric access
queries available at the c10 layer without requiring ATen dependencies.
The ATen layer now provides thin wrappers that ensure CUDA lazy
initialization before forwarding to c10. This separation allows
lower-level CUDA code to query P2P capabilities without pulling in
ATen context machinery.

Original diff by @minsii #173571

Bifferential Revision: D92675476

Refactor PeerToPeerAccess by moving the core implementation from aten/src/ATen/cuda to c10/cuda. This makes P2P and fabric access queries available at the c10 layer without requiring ATen dependencies. The ATen layer now provides thin wrappers that ensure CUDA lazy initialization before forwarding to c10. This separation allows lower-level CUDA code to query P2P capabilities without pulling in ATen context machinery. Differential Revision: [D92675476](https://our.internmc.facebook.com/intern/diff/D92675476/) [ghstack-poisoned]

pytorch-bot · 2026-02-09T06:06:45Z

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❌ 2 New Failures, 72 Cancelled Jobs, 3 Unrelated Failures

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This comment was automatically generated by Dr. CI and updates every 15 minutes.

Refactor PeerToPeerAccess by moving the core implementation from aten/src/ATen/cuda to c10/cuda. This makes P2P and fabric access queries available at the c10 layer without requiring ATen dependencies. The ATen layer now provides thin wrappers that ensure CUDA lazy initialization before forwarding to c10. This separation allows lower-level CUDA code to query P2P capabilities without pulling in ATen context machinery. Differential Revision: [D92675476](https://our.internmc.facebook.com/intern/diff/D92675476/) ghstack-source-id: 339391993 Pull Request resolved: #174582

pytorch-bot · 2026-02-09T06:06:48Z

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Refactor PeerToPeerAccess by moving the core implementation from aten/src/ATen/cuda to c10/cuda. This makes P2P and fabric access queries available at the c10 layer without requiring ATen dependencies. The ATen layer now provides thin wrappers that ensure CUDA lazy initialization before forwarding to c10. This separation allows lower-level CUDA code to query P2P capabilities without pulling in ATen context machinery. Differential Revision: [D92675476](https://our.internmc.facebook.com/intern/diff/D92675476/) [ghstack-poisoned]

Pull Request resolved: #174582 Refactor PeerToPeerAccess by moving the core implementation from aten/src/ATen/cuda to c10/cuda. This makes P2P and fabric access queries available at the c10 layer without requiring ATen dependencies. The ATen layer now provides thin wrappers that ensure CUDA lazy initialization before forwarding to c10. This separation allows lower-level CUDA code to query P2P capabilities without pulling in ATen context machinery. ghstack-source-id: 339394212 @exported-using-ghexport Differential Revision: [D92675476](https://our.internmc.facebook.com/intern/diff/D92675476/)

Skylion007 · 2026-02-09T17:03:07Z

c10/cuda/PeerToPeerAccess.cpp

+      num_devices_ >= 0,
+      "p2p access cache not initialized. "
+      "Ensure c10::cuda::detail::init_p2p_access_cache() is called first.");
+  TORCH_CHECK(


Some of these should TORCH_CHECK_VALUE but that should be another PR

ngimel · 2026-02-09T17:20:20Z

@pytorchbot merge

pytorchmergebot · 2026-02-09T17:24:28Z

Merge failed

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eqy · 2026-02-09T17:59:18Z

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ngimel · 2026-02-09T22:58:51Z

@pytorchbot merge

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@pytorchbot revert -m "Reverted automatically by pytorch's autorevert, to avoid this behaviour add the tag autorevert: disable" -c autorevert

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@claude Can you please read this revert comment, follow the links and read the errors, to then give a brief diagnostics on the cause of the error? If you judge the error to be legitimate reason for a revert, please provide brief guidance on how the author could fix it.

claude · 2026-02-10T17:31:13Z

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The revert is legitimate. The CI failure is a simple lint error caused by trailing whitespace.

File: torch/utils/hipify/cuda_to_hip_mappings.py
Line: 3416
Issue: The line added by this PR has 4 trailing spaces after the comma:

    ("c10/cuda/PeerToPeerAccess.h", "c10/hip/PeerToPeerAccess.h"),    ← trailing spaces here

The linter (SPACES rule) correctly flagged this as an error.

How to Fix

Remove the trailing spaces from line 3416 in torch/utils/hipify/cuda_to_hip_mappings.py
The line should end with just the comma, no trailing whitespace:
```
("c10/cuda/PeerToPeerAccess.h", "c10/hip/PeerToPeerAccess.h"),
```
Run lintrunner -a locally to auto-fix this and verify no other lint issues before re-submitting

This is a trivial fix - just remove the trailing spaces and the PR should pass CI.

pytorchmergebot · 2026-02-10T17:32:20Z

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This reverts commit c1bc0e9. Reverted #174582 on behalf of https://github.com/pytorch-auto-revert due to Reverted automatically by pytorch's autorevert, to avoid this behaviour add the tag autorevert: disable ([comment](#174582 (comment)))

pytorchmergebot · 2026-02-10T17:32:28Z

@ngimel your PR has been successfully reverted.

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Merge failed

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@minsii

Refactor PeerToPeerAccess by moving the core implementation from aten/src/ATen/cuda to c10/cuda. This makes P2P and fabric access queries available at the c10 layer without requiring ATen dependencies. The ATen layer now provides thin wrappers that ensure CUDA lazy initialization before forwarding to c10. This separation allows lower-level CUDA code to query P2P capabilities without pulling in ATen context machinery. Original diff by @minsii pytorch#173571 Bifferential Revision: [D92675476](https://our.internmc.facebook.com/intern/diff/D92675476/) Pull Request resolved: pytorch#174582 Approved by: https://github.com/Skylion007

This reverts commit c1bc0e9. Reverted pytorch#174582 on behalf of https://github.com/pytorch-auto-revert due to Reverted automatically by pytorch's autorevert, to avoid this behaviour add the tag autorevert: disable ([comment](pytorch#174582 (comment)))

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Back out "Revert D92675476: [c10] Move P2P access logic from ATen to c10" #174698

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❌ 2 New Failures, 72 Cancelled Jobs, 3 Unrelated Failures

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ngimel commented Feb 9, 2026 •

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