Lint and run tests workflow (xhluca/dl-translate)

The Lint and run tests workflow from xhluca/dl-translate, explained and optimized by Latchkey.

What it does

This is the Lint and run tests workflow from the xhluca/dl-translate 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: Lint and run tests

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: [3.8, 3.9]

    steps:
      - uses: actions/checkout@v2

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v2
        with:
          python-version: ${{ matrix.python-version }}
      
      - uses: actions/cache@v2
        # source: https://medium.com/ai2-blog/e9452698e98d
        with:
          path: ${{ env.pythonLocation }}
          key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}

      - name: Install requirements
        run: |
          python -m pip install --upgrade pip
          pip install --upgrade --upgrade-strategy eager -e .[dev]

      - name: Show setup install requires versions
        run: |
          pip show transformers torch tqdm protobuf tqdm

      - name: Lint code with black
        run: |
          black . --check

      - name: Run quick tests with pytest
        run: |
          pytest tests/quick

      - name: Run long tests with pytest
        if: ${{ matrix.python-version == '3.7' }}
        run: |
          pytest tests/long

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: Lint and run tests
 
on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      matrix:
        python-version: [3.8, 3.9]
 
    steps:
      - uses: actions/checkout@v2
 
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v2
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      
      - uses: actions/cache@v2
        # source: https://medium.com/ai2-blog/e9452698e98d
        with:
          path: ${{ env.pythonLocation }}
          key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py') }}
 
      - name: Install requirements
        run: |
          python -m pip install --upgrade pip
          pip install --upgrade --upgrade-strategy eager -e .[dev]
 
      - name: Show setup install requires versions
        run: |
          pip show transformers torch tqdm protobuf tqdm
 
      - name: Lint code with black
        run: |
          black . --check
 
      - name: Run quick tests with pytest
        run: |
          pytest tests/quick
 
      - name: Run long tests with pytest
        if: ${{ matrix.python-version == '3.7' }}
        run: |
          pytest tests/long
 

What changed

• Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
• Cancel superseded runs when a branch or PR gets a newer push.
• Cache dependency installs on the setup step so they are served from cache.
• Add a job timeout so a hung step cannot burn hours of runner time.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

• Dependency installs

This workflow runs 1 job (2 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