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ci: real-GPU tests on Metal (macOS arm64 runner) - #225
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Runs the opt-in real-GPU suite (test/gpu/runtests.jl, FI_GPU_BACKEND=metal) for PRs that touch the GPU code. A probe first checks that Metal.jl finds a usable device and runs a kernel (the runner's GPU is paravirtualized); without one the job warns and passes.
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Stacked on #224: targets its branch, to be retargeted to
masteronce #224 is merged.Summary
Runs the opt-in real-GPU suite (
test/gpu/runtests.jlwithFI_GPU_BACKEND=metal) on GitHub's arm64 macOS runner for PRs that touch the GPU code. The main CI checks the GPU extension's host-side logic with JLArrays, which compiles kernels as ordinary CPU code; this job compiles and runs them on a Metal device, so kernel compile failures (e.g. a throwing NoExtrap path left in a kernel) and the suite's inlining guard are checked on every relevant PR.src/core/,src/linear/,test/gpu/,Project.tomlor this workflow; pushes tomaster; manual dispatch.Open question
Whether the hosted runner's Metal device can run the suite: answered by this PR's first run.