Comment with PyTest Benchmark Github Action

This GitHub action comments on a pull request with the benchmark results written out from a pytest-benchmark run.

Usage

Create (or update) a workflow file in .github/workflow/benchmark.yml and add this action after you run your benchmark tests. You might need to tweak the installation and test run below to your own needs.

name: Benchmark
on: [pull_request]

jobs:
  benchmark:
    name: Run pytest-benchmark
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-python@v1
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt
      - name: Run benchmark
        run: |
          pytest benchmark.py --benchmark-only --benchmark-json output.json
      - name: Publish results
        uses: nils-braun/pytest-benchmark-commenter@v2

The github action is only supported for pull request events.

Configuration

Name	Default	Description
github-token	${{ secrets.GITHUB_TOKEN }}	Change this, if you do not want to use the default token
benchmark-file	output.json	Where your benchmark file is stored
comparison-benchmark-file	empty	Where to find the json output of an old pytest-benchmark, for comparison. Empty for no comparison.

Usage for comparison

If you want to compare the results of the benchmarks now to the most recent run on your default branch, you could do the following:

Create a workflow to upload the benchmarks on your default branch, e.g. upload.yml:

name: Upload the artifact
on:
  push:
    branches:
      - <your default branch>

jobs:
  test_action_job:
    runs-on: ubuntu-latest
    name: Test out the action in this repository
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      ... do the benchmarking ...

      - name: Upload the file
        uses: actions/upload-artifact@v2
        with:
          name: benchmark_results
          path: output.json

Now you can reference this in your workflow for comparison:

name: Test Action
on:
  pull_request:
    branches:
      - master

jobs:
  test_action_job:
    runs-on: ubuntu-latest
    name: Test out the action in this repository
    steps:
      - name: Checkout
        uses: actions/checkout@v2

      ... do the benchmarking ...

      - name: Download artifact
        uses: dawidd6/action-download-artifact@v2
        with:
          github_token: ${{ github.token }}
          workflow: upload.yml
          name: benchmark_results
          path: old_benchmark
          commit: ${{github.event.pull_request.base.sha}}
        continue-on-error: true
      - name: Run the action
        uses: nils-braun/pytest-benchmark-commenter@v2
        with:
          comparison-benchmark-file: "old_benchmark/output.json"