Test workflow (ezyang/ghstack)

The Test workflow from ezyang/ghstack, explained and optimized by Latchkey.

What it does

This is the Test workflow from the ezyang/ghstack repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

name: Test
on:
  pull_request:
  push:
    branches:
      - main

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  test:
    strategy:
      fail-fast: false
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
    runs-on: ${{ matrix.os }}
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Install uv
        uses: astral-sh/setup-uv@v5
        with:
          python-version: ${{ matrix.python-version }}
          enable-cache: true
          cache-suffix: "optional-suffix"
      - name: Run tests
        run: uv run --frozen pytest --verbose

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Test
on:
  pull_request:
  push:
    branches:
      - main
 
concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true
 
jobs:
  test:
    timeout-minutes: 30
    strategy:
      fail-fast: false
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
    runs-on: ${{ matrix.os }}
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Install uv
        uses: astral-sh/setup-uv@v5
        with:
          python-version: ${{ matrix.python-version }}
          enable-cache: true
          cache-suffix: "optional-suffix"
      - name: Run tests
        run: uv run --frozen pytest --verbose
 

What changed

• Add a job timeout so a hung step cannot burn hours of runner time.

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

This workflow runs 1 job (15 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow