simulated-gpu.yml

name: Tests on a simulated GPU

# GitHub's runners have no GPU, so ccpp.yml builds GPUJPEG but cannot run
# anything that encodes or decodes. PantheonSim simulates an NVIDIA T4 on the
# runner's CPU, so the unit tests and the regression suite run here, on every
# push and pull request. It checks results, not speed; a real GPU is still the
# final word.
on:
  push:
    branches:
      - devel
      - master
      - run_tests
    paths:
      - '.github/workflows/simulated-gpu.yml'
      - '**.c'
      - '**.cpp'
      - '**.cu'
      - '**.h'
      - '**.hpp'
      - '**.m'
      - '**.mm'
      - 'CMakeLists.txt'
  pull_request:

# The simulated-GPU job reads the repository and nothing else. The
# simulator's action uses no token or secrets, and installs packages only from
# Ubuntu and NVIDIA.
permissions:
  contents: read

jobs:
  tests:
    runs-on: ubuntu-24.04
    steps:
    - uses: actions/checkout@main
    - name: Simulated GPU (NVIDIA T4) and Ubuntu's CUDA toolkit
      uses: pantheongpu/setup-pantheonsim@052a0ac31bf6ec72a471d51aae29b7cbd090c6bf # v0.1.1
      with:
        gpu: nvidia/t4
    - name: Tools the regression suite compares images with
      run: sudo apt-get install -y imagemagick ffmpeg
    # The simulator stands in for the CUDA runtime at run time, so the library
    # links the shared one; 75 carries PTX for the simulated T4.
    - name: Build
      run: |
        cmake -Bbuild -DCMAKE_BUILD_TYPE=Release -DCMAKE_CUDA_ARCHITECTURES=75 \
          -DCMAKE_CUDA_RUNTIME_LIBRARY=Shared -DENABLE_FPNGE=ON
        cmake --build build --parallel
    - name: Unit and regression tests on the simulated GPU
      run: ctest --test-dir build --output-on-failure