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[fix] allow exporting custom Metal kernels without a Metal backend - #3650
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zcbenz merged 1 commit intoJun 17, 2026
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This now conflicts with #3638, which made the tracing state thread-local. My plan is to rebase on main and make the new |
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This basically looks good to me, a rebase and changing the counter to threadlcoal would be enough. |
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Done, rebase on main and change counter to threadlocal. |
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Just fixed explicitly pass |
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Would you mind rebasing the PR to fix merge conflict with #3662? |
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- Move metal_kernel graph construction to backend/common so it builds on all platforms - During export tracing without Metal, record the kernel on a placeholder GPU stream which the importing process remaps to a real stream - Outside of export tracing, calling the kernel without Metal still raises an error Fixes ml-explore#3240
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Proposed changes
Fixes #3240
mx.fast.metal_kernelthrows at construction on non-Metal builds, so functionsusing custom Metal kernels can't be exported from Linux.
metal_kernelgraph construction to backend/common so it builds on all platformsThe same mechanism could support exporting
mx.fast.cuda_kernelfrom non-CUDAplatforms; happy to do that as a follow-up.
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xin the boxes that apply.pre-commit run --all-filesto format my code / installed pre-commit prior to committing changes