Vulkan: support Linux/Windows desktop GPUs and opt-in wheel builds by Reubend · Pull Request #20138 · pytorch/executorch

Reubend · 2026-06-09T03:53:55Z

Summary

We already provide good desktop support for NVIDIA GPUs through our CUDA backend, which works well on both Linux and Windows. However, our Vulkan backend only provides solid support for Android, leaving AMD GPUs without sufficient support. That's a shame since Vulkan is well supported on every operating system and with every major GPU manufacturer.

This PR gets the Vulkan backend building and running correctly on Linux and Windows desktop GPUs (NVIDIA, AMD, Intel), and adds an opt-in way to build pre-built Vulkan binaries. It leaves everything Android related the same so that we don't regress anything for that platform.

Most of the backend was already portable, So this is mostly build fixes, a few small fixes for desktop GPUs, and packaging/CI plumbing.

fixes:#20140

Changes

Picks the right exception flag for MSVC vs GCC/Clang, finds glslc on Windows, suppresses third-party (VMA) warnings on GCC/MSVC, and gives a clear error if the Vulkan submodules aren't checked out.
Compiles the cooperative-matrix shader. It needs a newer Vulkan target than the default, so that one shader now builds against Vulkan 1.3.
Fixes correctness on desktop GPUs. Turns on the device features the shaders actually use (int16/int64/float64), which were never enabled before; picks a discrete GPU instead of the first one found if one exists (with an ETVK_DEVICE_INDEX override for multi-GPU machines); avoids an invalid image-copy on compute-only queues; and fixes a buffer-size check that compared the wrong units.
Makes the small_texture_limits export option work as intended. It was being silently dropped; now it round-trips so you can target GPUs with smaller texture limits. Adds a small unit test for it.
Adds opt-in packaging and CI. Behind the EXECUTORCH_BUILD_VULKAN flag, the wheel build can include Vulkan; adds a real-GPU (NVIDIA) test job and a Windows/MSVC build job. The default wheel and other backends are untouched.

Android Safety

Every change is gated so Android behaves exactly as before: build differences are behind compiler/OS checks, the new export and runtime options are opt-in and default to today's behavior, and the device-selection / feature changes are based on what the GPU reports . The existing SwiftShader CI job is unchanged.

Testing

Built with the Vulkan SDK (glslc on PATH) and run on an NVIDIA A100 (driver 580.126.09, Vulkan 1.4.312):

# Build the backend + a runner (the Vulkan SDK's glslc must be on PATH)
cmake -B cmake-out -S . -GNinja -DCMAKE_BUILD_TYPE=Release \
    -DEXECUTORCH_BUILD_VULKAN=ON \
    -DEXECUTORCH_BUILD_EXTENSION_TENSOR=ON \
    -DEXECUTORCH_BUILD_EXECUTOR_RUNNER=ON

cmake --build cmake-out --target vulkan_backend executor_runner   # 402/402, 0 errors

# Export a model to Vulkan and run it on the GPU
python -m examples.vulkan.export -m mv2 -o .
./cmake-out/executor_runner --model_path mv2.pte

I ran a small fp32 model and an int8 model on the A100 and matched the reference output (fp32 to 5 decimals, int8 to 4 decimals). The int8 run exercises the integer-dot-product / int16 shaders that SwiftShader can't run.
All the shaders compiled fine and the new unit tests added here passed.

I didn't test the windows build yet, so I'll be relying on CI for that.

TODO

We also need to publish a Vulkan wheel to PyPI. The build supports it (EXECUTORCH_BUILD_VULKAN=1 + glslc), but we need a Vulkan entry added to the shared build-wheels-*.yml workflows.

cc @SS-JIA @manuelcandales @digantdesai @cbilgin

pytorch-bot · 2026-06-09T03:53:58Z

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20138

📄 Preview Python docs built from this PR

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

❗ 1 Active SEVs

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[ROCm] MI350 CI jobs will have longer queue times due to CI migration

❌ 43 New Failures, 11 Unclassified Failures

As of commit f7ed588 with merge base e285edf ():

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pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
RuntimeError: Command docker exec -t a8774988bb8173028e5b84c07297192fff68ede50aa1b737096b67e762069010 /exec failed with exit code 1
pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
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pull / test-qnn-buck-build-linux / linux-job (gh)
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pull / test-qnn-delegate-linux / linux-job (gh)
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pull / test-qnn-models-linux (dl3) / linux-job (gh)
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pull / test-qnn-models-linux (mv2) / linux-job (gh)
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pull / test-qnn-models-linux (mv3) / linux-job (gh)
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pull / test-qnn-passes-linux / linux-job (gh)
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pull / test-qnn-python-imports-linux / linux-job (gh)
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pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh)
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pull / test-qnn-testsuite-linux / test-backend-linux (qnn, operators) / linux-job (gh)
RuntimeError: Command docker exec -t a7f144f3188964dd3ba77f81e121387cf358028cb480bb3e55a67f9ee05d3710 /exec failed with exit code 1
pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
RuntimeError: Command docker exec -t aefa1e753114dc903d20fd80613568b6ce3dc1d12724d8311fa0ba1bd4d63c82 /exec failed with exit code 1
pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
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pull / test-qnn-wheel-packages-linux (3.13) / linux-job (gh)
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pull / test-sqnr-static-llm-qnn-linux (smollm2_135m) / linux-job (gh)
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pull / test-static-llama-qnn-linux (stories_110m) / linux-job (gh)
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pull / test-static-llama-qnn-linux (stories_260k_bc) / linux-job (gh)
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Test QNN Backend / test-qnn / test-backend-linux (qnn, models) / linux-job (gh)
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Test QNN Backend / test-qnn / test-backend-linux (qnn, operators) / linux-job (gh)
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trunk / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
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trunk / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
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trunk / test-qnn-model (fp32, conv_former) / linux-job (gh)
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trunk / test-qnn-model (fp32, dl3) / linux-job (gh)
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trunk / test-qnn-optimum-model (fp32, distilbert) / linux-job (gh)
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trunk / test-qnn-optimum-model (fp32, efficientnet) / linux-job (gh)
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trunk / test-qnn-optimum-model (fp32, mobilevit_v1) / linux-job (gh)
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trunk / test-qnn-optimum-model (fp32, mobilevit_v2) / linux-job (gh)
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trunk / test-qnn-optimum-model (fp32, roberta) / linux-job (gh)
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UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

Build Linux Wheels / pytorch/executorch / build-manywheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
Process completed with exit code 1.
Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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RuntimeError: Command docker exec -t 1e6256c3201fbda1c9f294404649643fb600fc56cdbf363d9b2ed84fe580f05c /exec failed with exit code 127
Test Vulkan Backend (specialized runners) / test-vulkan-nvidia / linux-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
RuntimeError: Command docker exec -t 743201b9fc2a755261388a70eecbe669c6bbab74e0bd5163504a9bdabf121ff2 /exec failed with exit code 1
trunk / test-cortex-m-ops / run (cortex-m0plus) / cortex-m-ops-cortex-m0plus (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
RuntimeError: Command docker exec -t be2c6921a66433187c3f77614f9a7104fea5ad23d3e4e5c39eee8dcec6b53cb5 /exec failed with exit code 4
trunk / test-cortex-m-ops / run (cortex-m7) / cortex-m-ops-cortex-m7 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
RuntimeError: Command docker exec -t e309173eb46b42befff9658c1848b85f93511cc2f81c907174513703e7e4cc7d /exec failed with exit code 4
trunk / test-models-macos-cpu (mobilebert, xnnpack-quantization-delegation) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
trunk / test-models-macos-cpu (resnet50, xnnpack-quantization-delegation) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
trunk / test-models-macos-cpu (vit, xnnpack-quantization-delegation) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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linux-foundation-easycla · 2026-06-09T03:54:04Z

The committers listed above are authorized under a signed CLA.

✅ login: Reubend / name: Reuben Dunn (427011e)

Reubend · 2026-06-09T16:56:20Z

I took a look at the 3 test failures that the CI found, and I don't think that they're caused by any of my changes here. Please let me know if you find anything that indicates differently.

SS-JIA · 2026-06-11T22:52:39Z

ack. Taking a look soon.

SS-JIA

⏺ PR #20138 — changes by theme

  Theme 1: Build portability (make it compile off-Android)

  - backends/vulkan/CMakeLists.txt — per-compiler exception flag (/EHsc MSVC vs -fexceptions); submodule-existence check w/ actionable error.
  - backends/vulkan/cmake/ShaderLibrary.cmake — find glslc via VULKAN_SDK HINTS (Windows); graceful skip in wheel builds.
  - backends/vulkan/runtime/vk_api/memory/vma_api.h — warning suppression for GCC + MSVC (was clang-only).
  - backends/vulkan/runtime/gen_vulkan_spv.py — NameError guard when cache_dir is None.

  Theme 2: Shader compilation

  - backends/vulkan/runtime/graph/ops/glsl/coopmat_mm.yaml — target Vulkan 1.3 so GL_KHR_cooperative_matrix (needs SPIR-V 1.6) compiles.

  Theme 3: Runtime correctness on desktop GPUs

  - vk_api/Adapter.cpp — enable int16/int64/float64 device features shaders already use.
  - vk_api/Runtime.cpp — prefer discrete GPU over software/integrated; ETVK_DEVICE_INDEX override.
  - api/Context.cpp — guard blit against compute-only queues.
  - api/containers/Tensor.cpp — fix buffer-size check (bytes vs numel).

  Theme 4: AOT compile-option round-trip fix

  - vulkan_preprocess.py — deserialize small_texture_limits + skip_memory_planning (were silently dropped); fix tuple-mutation bug.
  - partitioner/vulkan_partitioner.py — wire small_texture_limits into partition texture limits.
  - utils.py — add SMALL_TEXTURE_LIMITS constant.
  - test/test_vulkan_compile_options.py — regression test for round-trip.

  Theme 5: Packaging (opt-in wheel)

  - setup.py — build vulkan_backend target when EXECUTORCH_BUILD_VULKAN.
  - tools/cmake/preset/pybind.cmake — enable Vulkan in Linux/Windows wheel if flag + glslc present.

  Theme 6: CI infra

  - .github/workflows/test-backend-vulkan.yml — new real-GPU (NVIDIA) job.
  - .github/workflows/vulkan-windows.yml — new MSVC build job.
  - .ci/scripts/test_backend.sh — pick real-gpu vs swiftshader ICD.
  - .ci/scripts/setup-vulkan-linux-deps.sh — arg-based SwiftShader/real-GPU setup.
  - .ci/scripts/setup-vulkan-windows-deps.ps1, setup-windows-msvc-vulkan.ps1 — Windows glslc + build.
  - .ci/scripts/wheel/pre_build_script.sh — provision Vulkan SDK/submodules when flag set.
  - .ci/scripts/wheel/test_linux.py, test_windows.py — check VulkanBackend registered.

All changes from Theme 1 through 5 look super solid! Thanks for putting together those fixes.

For Theme 6, just have a small request regarding the new CI tests added. Overall, the PR looks great!

I'll also import this PR as a diff just so that these changes can run against our Meta internal CI flows. Note that this diff won't be landed, I will abandon and unlink it from the PR once we get the CI signals.

meta-codesync · 2026-06-12T03:19:32Z

@SS-JIA has imported this pull request. If you are a Meta employee, you can view this in D108371716.

Reubend · 2026-06-13T01:20:14Z

Thanks @SS-JIA! I addressed the comments and also fixed a separate issue I found inside of allocate_buffer. For the VK_CHECK_COND that was breaking internal tests, I reverted it to the way it was but left a comment indicating how we need to fix it in the future.

The Vulkan backend was developed for Android GPUs. This makes it build and run on Linux/Windows desktop discrete GPUs (NVIDIA/AMD/Intel) and adds opt-in pre-built Vulkan wheels, with no change to Android behavior (build divergence is behind compile-time guards; runtime changes key off queried capabilities). Covers build portability, discrete-GPU correctness fixes (real-GPU device/ICD selection, shaderInt16/Int64/Float64 enablement, a blit queue guard, and texel-rounded buffer allocations to avoid out-of-bounds vec4 reads), and EXECUTORCH_BUILD_VULKAN-gated CI/packaging (a new vulkan.yml runs the real-GPU NVIDIA and Windows MSVC jobs, plus opt-in wheel plumbing). Tested on an NVIDIA A100; the SwiftShader CI path is unchanged. This change was authored with Claude.

Reubend added module: vulkan Issues related to the Vulkan delegate and code under backends/vulkan/ release notes: vulkan Changes to the Vulkan backend delegate labels Jun 9, 2026

meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Jun 9, 2026

Reubend force-pushed the vulkan-compatibility branch 2 times, most recently from 23db5fc to 1904c5c Compare June 9, 2026 04:47

Reubend marked this pull request as ready for review June 9, 2026 16:55

Reubend requested review from SS-JIA, kirklandsign and larryliu0820 as code owners June 9, 2026 16:55

Reubend added this to ExecuTorch Vulkan Backend Jun 9, 2026

github-project-automation Bot moved this to To triage in ExecuTorch Vulkan Backend Jun 9, 2026

SS-JIA requested changes Jun 12, 2026

View reviewed changes

Comment thread backends/vulkan/runtime/api/Context.cpp Outdated

Comment thread backends/vulkan/runtime/vk_api/Runtime.cpp Outdated

Comment thread .github/workflows/vulkan-windows.yml Outdated

SS-JIA reviewed Jun 12, 2026

View reviewed changes

Comment thread backends/vulkan/runtime/api/containers/Tensor.cpp Outdated

Reubend force-pushed the vulkan-compatibility branch from 1904c5c to 3c00f2e Compare June 13, 2026 01:17

Reubend had a problem deploying to cadence June 13, 2026 01:17 — with GitHub Actions Failure

Reubend force-pushed the vulkan-compatibility branch from 3c00f2e to f7ed588 Compare June 13, 2026 04:28

Reubend had a problem deploying to cadence June 13, 2026 04:28 — with GitHub Actions Failure

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Vulkan: support Linux/Windows desktop GPUs and opt-in wheel builds#20138

Vulkan: support Linux/Windows desktop GPUs and opt-in wheel builds#20138
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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20138

❗ 1 Active SEVs

❌ 43 New Failures, 11 Unclassified Failures

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Reubend commented Jun 9, 2026

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Reubend commented Jun 9, 2026 •

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pytorch-bot Bot commented Jun 9, 2026 •

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linux-foundation-easycla Bot commented Jun 9, 2026 •

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