test-gpu-cloudrun.yml

name: GPU Tests (Metal)

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  workflow_dispatch:

env:
  BUILD_TYPE: Release

jobs:
  metal-gpu:
    runs-on: macos-latest-xlarge  # Bare-metal Apple Silicon with GPU access

    steps:
    - uses: actions/checkout@v4

    - name: Cache CMake FetchContent dependencies
      uses: actions/cache@v4
      with:
        path: build/_deps
        key: deps-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('CMakeLists.txt') }}
        restore-keys: |
          deps-${{ runner.os }}-${{ runner.arch }}-

    - name: System info
      run: |
        echo "=== System Info ==="
        uname -a
        sysctl -n machdep.cpu.brand_string || true
        system_profiler SPHardwareDataType | grep -E "Chip|Memory|Cores" || true
        echo ""
        echo "=== Metal Device ==="
        system_profiler SPDisplaysDataType | grep -E "Chipset|Metal|VRAM" || true

    - name: Install dependencies
      run: |
        brew install openblas llvm

    - name: Configure CMake
      run: |
        LLVM_PREFIX="$(brew --prefix llvm)"
        OPENBLAS_PREFIX="$(brew --prefix openblas)"
        export PATH="${LLVM_PREFIX}/bin:$PATH"
        export LDFLAGS="-L${OPENBLAS_PREFIX}/lib"
        export CPPFLAGS="-I${OPENBLAS_PREFIX}/include"
        cmake -S . -B build \
          -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} \
          -DSPRUX_USE_CUBLAS=OFF \
          -DSPRUX_USE_METAL=ON \
          -DSPRUX_USE_OPENCL=OFF \
          -DSPRUX_BUILD_TESTS=ON \
          -DSPRUX_BUILD_EXAMPLES=ON \
          -DBLA_VENDOR=OpenBLAS \
          -DCMAKE_PREFIX_PATH="${OPENBLAS_PREFIX}"

    - name: Build
      run: |
        LLVM_PREFIX="$(brew --prefix llvm)"
        export PATH="${LLVM_PREFIX}/bin:$PATH"
        cmake --build build --config ${{ env.BUILD_TYPE }} -j"$(sysctl -n hw.ncpu)"

    - name: Run all tests (CPU + Metal GPU)
      run: |
        ctest --test-dir build --output-on-failure -j"$(sysctl -n hw.ncpu)"

    - name: Run benchmarks
      run: |
        echo "=== CPU Baseline (BLAS) ==="
        ./build/sprux/benchmarking/bench -S "BLAS" -n 3 2>&1 || true
        echo ""
        echo "=== Metal GPU ==="
        ./build/sprux/benchmarking/bench -S "Metal" -n 3 2>&1 || true

    - name: Summary
      if: always()
      run: |
        {
          echo "## Metal GPU Test Results"
          echo ""
          echo "- **Commit:** \`${{ github.sha }}\`"
          echo "- **Runner:** macos-latest-xlarge (Apple Silicon)"
          echo "- **Chip:** $(system_profiler SPHardwareDataType | grep 'Chip' | cut -d':' -f2 | xargs || echo unknown)"
          echo ""
          if [ "${{ job.status }}" = "success" ]; then
            echo ":white_check_mark: All tests passed (CPU + Metal GPU)"
          else
            echo ":x: Tests failed"
          fi
        } >> "$GITHUB_STEP_SUMMARY"