tests_gpu_cpp.yml

name: Testing::x86_64::GPU::C++
on:
  workflow_call:
    inputs:
      lightning-version:
        type: string
        required: true
        description: The version of Lightning to use. Valid values are either 'release' (most recent release candidate), 'stable' (most recent git-tag) or 'latest' (most recent commit from master)
      pennylane-version:
        type: string
        required: true
        description: The version of PennyLane to use. Valid values are either 'release' (most recent release candidate), 'stable' (most recent git-tag) or 'latest' (most recent commit from master)
  pull_request:
    types:
      - opened
      - reopened
      - synchronize
      - ready_for_review
  push:
    branches:
      - master

env:
  CI_CUDA_ARCH: 86
  COVERAGE_FLAGS: "--cov=pennylane_lightning --cov-report=term-missing --cov-report=xml:./coverage.xml --no-flaky-report -p no:warnings --tb=native"
  GCC_VERSION: 11

concurrency:
  group: tests_gpu_cpp-${{ github.ref }}-${{ github.event_name }}-${{ inputs.lightning-version }}-${{ inputs.pennylane-version }}
  cancel-in-progress: true

jobs:
  builddeps:
    if: ${{ github.event_name != 'pull_request' || (github.event.pull_request.draft == false && contains(github.event.pull_request.labels.*.name, 'ci:use-gpu-runner')) }}
    runs-on:
      - self-hosted
      - ubuntu-22.04
      - gpu

    strategy:
      max-parallel: 1
      matrix:
        cuda_version: ["12"]

    steps:
      - name: Validate GPU version and installed compiler
        run: |
          source /etc/profile.d/modules.sh
          module use /opt/modules
          module load cuda/${{ matrix.cuda_version }}
          echo "${PATH}" >> $GITHUB_PATH
          echo "LD_LIBRARY_PATH=${LD_LIBRARY_PATH}" >> $GITHUB_ENV
          nvcc --version
          nvidia-smi

  cpptests:
    if: ${{ !contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name) }}
    needs: [builddeps]
    strategy:
      matrix:
        pl_backend: ["lightning_gpu", "lightning_tensor"]
        cuda_version: ["12"]

    name: C++ Tests (${{ matrix.pl_backend }}, cuda-${{ matrix.cuda_version }})
    runs-on:
      - ubuntu-22.04
      - self-hosted
      - gpu

    steps:
      - name: Validate GPU version and installed compiler
        run: |
          source /etc/profile.d/modules.sh
          module use /opt/modules
          module load cuda/${{ matrix.cuda_version }}
          echo "${PATH}" >> $GITHUB_PATH
          echo "LD_LIBRARY_PATH=${LD_LIBRARY_PATH}" >> $GITHUB_ENV
          nvcc --version
          nvidia-smi

      - name: Checkout PennyLane-Lightning
        uses: actions/checkout@v4
        with:
          path: main

      - uses: actions/setup-python@v5
        name: Setup Python
        with:
          python-version: '3.10'

      - name: Setup Python virtual environment
        id: setup_venv
        env:
          VENV_NAME: ${{ github.workspace }}/venv_${{ steps.setup_python.outputs.python-version }}_${{ github.sha }}_${{ matrix.pl_backend }}
        run: |
          # Clear any pre-existing venvs
          rm -rf venv_*

          # Create new venv for this workflow_run
          python --version
          python -m venv ${{ env.VENV_NAME }}

          # Add the venv to PATH for subsequent steps
          echo ${{ env.VENV_NAME }}/bin >> $GITHUB_PATH

          # Adding venv name as an output for subsequent steps to reference if needed
          echo "venv_name=${{ env.VENV_NAME }}" >> $GITHUB_OUTPUT
          echo "Python_ROOT_DIR=${{ env.VENV_NAME }}" >> $GITHUB_ENV
          echo "Python3_ROOT_DIR=${{ env.VENV_NAME }}" >> $GITHUB_ENV

          # Adding venv site-packages to output for subsequent step to referece if needed
          echo "site_packages_dir=$(${{ env.VENV_NAME }}/bin/python -c 'import sysconfig; print(sysconfig.get_path("platlib"))')" >> $GITHUB_OUTPUT

      - name: Display Python-Path
        id: python_path
        run: |
          py_path=$(which python)
          echo "Python Interpreter Path => $py_path"
          echo "python=$py_path" >> $GITHUB_OUTPUT

          pip_path=$(which pip)
          echo "PIP Path => $pip_path"
          echo "pip=$pip_path" >> $GITHUB_OUTPUT

      - name: Install required basic packages
        run: |
          python -m pip install ninja cmake scipy

      - name: Install required lightning_gpu only packages
        if: matrix.pl_backend == 'lightning_gpu'
        run: |
          python -m pip install custatevec-cu${{ matrix.cuda_version }}

      - name: Install required lightning_tensor only packages
        if: matrix.pl_backend == 'lightning_tensor'
        run: |
          python -m pip install cutensornet-cu${{ matrix.cuda_version }}

      - name: Build and run unit tests
        run: |
          cd main
          cmake . -BBuild \
            -DCUQUANTUM_SDK=$(python -c "import site; print( f'{site.getsitepackages()[0]}/cuquantum')")\
            -DBUILD_TESTS=ON \
            -DENABLE_PYTHON=OFF \
            -DPL_BACKEND=${{ matrix.pl_backend }} \
            -DCMAKE_CXX_COMPILER=$(which g++-$GCC_VERSION) \
            -DENABLE_COVERAGE=ON \
            -G Ninja
          cmake --build ./Build
          cd ./Build
          mkdir -p ./tests/results_${{ github.job }}_${{ matrix.pl_backend }}
          for file in *runner ; do ./$file --order lex --reporter junit --out ./tests/results_${{ github.job }}_${{ matrix.pl_backend }}/report_$file.xml; done;
          lcov --directory . -b ../pennylane_lightning/core/src --capture --output-file coverage.info
          lcov --remove coverage.info '/usr/*' --output-file coverage.info
          mv coverage.info coverage-${{ github.job }}-${{ matrix.pl_backend }}.info

      - name: Upload test results
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: ubuntu-tests-reports-${{ github.job }}_${{ matrix.pl_backend }}
          path: ./main/Build/tests/results_${{ github.job }}_${{ matrix.pl_backend }}
          retention-days: 1
          if-no-files-found: error
          include-hidden-files: true

      - name: Upload code coverage results
        uses: actions/upload-artifact@v4
        with:
          name: ubuntu-codecov-results-cpp-${{ matrix.pl_backend }}
          path: ./main/Build/coverage-${{ github.job }}-${{ matrix.pl_backend }}.info
          retention-days: 1
          if-no-files-found: error
          include-hidden-files: true

  upload-to-codecov-linux-cpp:
    needs: [cpptests]
    name: Upload coverage data to codecov
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Download coverage reports
        uses: actions/download-artifact@v4
        with:
          pattern: ubuntu-codecov-*
          merge-multiple: true

      - name: Upload to Codecov
        uses: codecov/codecov-action@v4
        with:
          fail_ci_if_error: true
          verbose: true
          token: ${{ secrets.CODECOV_TOKEN }}

      - name: Cleanup
        if: always()
        run: |
          rm -rf ${{ steps.setup_venv.outputs.venv_name }}
          rm -rf *
          rm -rf .git
          rm -rf .gitignore
          rm -rf .github
          pip cache purge