benchmarks workflow (facebook/stylex)

The benchmarks workflow from facebook/stylex, explained and optimized by Latchkey.

CI health: C - fair

Point runs-on at Latchkey and get run de-duplication, job timeouts, SHA-pinned actions, self-healing for flaky steps, and up to 58% lower cost, applied automatically.

Grade your own workflow free or run it on Latchkey →

Source: facebook/stylex.github/workflows/benchmarks.ymlLicense MITView source

What it does

This is the benchmarks workflow from the facebook/stylex 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

workflow (.yml)

name: benchmarks

on: [pull_request]

jobs:
  perf:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v6
      with:
        fetch-depth: 50
    - uses: actions/setup-node@v6
      with:
        node-version: '22.x'
        cache: 'yarn'
        cache-dependency-path: yarn.lock
    - run: corepack prepare yarn@1.22.22 --activate
    - name: 'Setup temporary files'
      run: |
        echo "BASE_JSON=$(mktemp)" >> $GITHUB_ENV
        echo "PATCH_JSON=$(mktemp)" >> $GITHUB_ENV
    - name: 'Benchmark base'
      run: |
        git checkout -f ${{ github.event.pull_request.base.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        if yarn workspace benchmarks run perf -- -o ${{ env.BASE_JSON }}; then
          echo "Ran successfully on base branch"
        else
          echo "{}" > ${{ env.BASE_JSON }}  # Empty JSON as default
          echo "Benchmark script not found on base branch, using default values"
        fi
    - name: 'Benchmark patch'
      run: |
        git checkout -f ${{ github.event.pull_request.head.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        yarn workspace benchmarks run perf -- -o ${{ env.PATCH_JSON }}
        echo "Ran successfully on patch branch"
    - name: 'Collect results'
      id: collect
      run: |
        echo "table<<EOF" >> $GITHUB_OUTPUT
        yarn workspace benchmarks run compare -- ${{ env.BASE_JSON }} ${{ env.PATCH_JSON }} >> markdown
        cat markdown >> $GITHUB_OUTPUT
        echo "EOF" >> $GITHUB_OUTPUT
    - name: 'Post comment'
      uses: edumserrano/find-create-or-update-comment@v3
      with:
        issue-number: ${{ github.event.pull_request.number }}
        body-includes: '<!-- workflow-benchmarks-perf-data -->'
        comment-author: 'github-actions[bot]'
        body: |
          <!-- workflow-benchmarks-perf-data -->
          ### workflow: benchmarks/perf
          Comparison of performance test results, measured in operations per second. Larger is better.
          ${{ steps.collect.outputs.table }}
        edit-mode: replace

  size:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v6
      with:
        fetch-depth: 50
    - uses: actions/setup-node@v6
      with:
        node-version: '22.x'
        cache: 'yarn'
        cache-dependency-path: yarn.lock
    - run: corepack prepare yarn@1.22.22 --activate
    - name: 'Setup temporary files'
      run: |
        echo "BASE_JSON=$(mktemp)" >> $GITHUB_ENV
        echo "PATCH_JSON=$(mktemp)" >> $GITHUB_ENV
    - name: 'Benchmark base'
      run: |
        git checkout -f ${{ github.event.pull_request.base.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        if yarn workspace benchmarks run size -- -o ${{ env.BASE_JSON }}; then
          echo "Ran successfully on base branch"
        else
          echo "{}" > ${{ env.BASE_JSON }}  # Empty JSON as default
          echo "Benchmark script not found on base branch, using default values"
        fi
    - name: 'Benchmark patch'
      run: |
        git checkout -f ${{ github.event.pull_request.head.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        yarn workspace benchmarks run size -- -o ${{ env.PATCH_JSON }}
        echo "Ran successfully on patch branch"
    - name: 'Collect results'
      id: collect
      run: |
        echo "table<<EOF" >> $GITHUB_OUTPUT
        yarn workspace benchmarks run compare -- ${{ env.BASE_JSON }} ${{ env.PATCH_JSON }} >> markdown
        cat markdown >> $GITHUB_OUTPUT
        echo "EOF" >> $GITHUB_OUTPUT
    - name: 'Post comment'
      uses: edumserrano/find-create-or-update-comment@v3
      with:
        issue-number: ${{ github.event.pull_request.number }}
        body-includes: '<!-- workflow-benchmarks-size-data -->'
        comment-author: 'github-actions[bot]'
        body: |
          <!-- workflow-benchmarks-size-data -->
          ### workflow: benchmarks/size
          Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.
          ${{ steps.collect.outputs.table }}
        edit-mode: replace

The same workflow, on Latchkey

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

name: benchmarks
 
on: [pull_request]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  perf:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
    - uses: actions/checkout@v6
      with:
        fetch-depth: 50
    - uses: actions/setup-node@v6
      with:
        node-version: '22.x'
        cache: 'yarn'
        cache-dependency-path: yarn.lock
    - run: corepack prepare yarn@1.22.22 --activate
    - name: 'Setup temporary files'
      run: |
        echo "BASE_JSON=$(mktemp)" >> $GITHUB_ENV
        echo "PATCH_JSON=$(mktemp)" >> $GITHUB_ENV
    - name: 'Benchmark base'
      run: |
        git checkout -f ${{ github.event.pull_request.base.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        if yarn workspace benchmarks run perf -- -o ${{ env.BASE_JSON }}; then
          echo "Ran successfully on base branch"
        else
          echo "{}" > ${{ env.BASE_JSON }}  # Empty JSON as default
          echo "Benchmark script not found on base branch, using default values"
        fi
    - name: 'Benchmark patch'
      run: |
        git checkout -f ${{ github.event.pull_request.head.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        yarn workspace benchmarks run perf -- -o ${{ env.PATCH_JSON }}
        echo "Ran successfully on patch branch"
    - name: 'Collect results'
      id: collect
      run: |
        echo "table<<EOF" >> $GITHUB_OUTPUT
        yarn workspace benchmarks run compare -- ${{ env.BASE_JSON }} ${{ env.PATCH_JSON }} >> markdown
        cat markdown >> $GITHUB_OUTPUT
        echo "EOF" >> $GITHUB_OUTPUT
    - name: 'Post comment'
      uses: edumserrano/find-create-or-update-comment@v3
      with:
        issue-number: ${{ github.event.pull_request.number }}
        body-includes: '<!-- workflow-benchmarks-perf-data -->'
        comment-author: 'github-actions[bot]'
        body: |
          <!-- workflow-benchmarks-perf-data -->
          ### workflow: benchmarks/perf
          Comparison of performance test results, measured in operations per second. Larger is better.
          ${{ steps.collect.outputs.table }}
        edit-mode: replace
 
  size:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
    - uses: actions/checkout@v6
      with:
        fetch-depth: 50
    - uses: actions/setup-node@v6
      with:
        node-version: '22.x'
        cache: 'yarn'
        cache-dependency-path: yarn.lock
    - run: corepack prepare yarn@1.22.22 --activate
    - name: 'Setup temporary files'
      run: |
        echo "BASE_JSON=$(mktemp)" >> $GITHUB_ENV
        echo "PATCH_JSON=$(mktemp)" >> $GITHUB_ENV
    - name: 'Benchmark base'
      run: |
        git checkout -f ${{ github.event.pull_request.base.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        if yarn workspace benchmarks run size -- -o ${{ env.BASE_JSON }}; then
          echo "Ran successfully on base branch"
        else
          echo "{}" > ${{ env.BASE_JSON }}  # Empty JSON as default
          echo "Benchmark script not found on base branch, using default values"
        fi
    - name: 'Benchmark patch'
      run: |
        git checkout -f ${{ github.event.pull_request.head.sha }}
        git clean -fdx
        yarn install --frozen-lockfile --silent
        yarn workspace benchmarks run size -- -o ${{ env.PATCH_JSON }}
        echo "Ran successfully on patch branch"
    - name: 'Collect results'
      id: collect
      run: |
        echo "table<<EOF" >> $GITHUB_OUTPUT
        yarn workspace benchmarks run compare -- ${{ env.BASE_JSON }} ${{ env.PATCH_JSON }} >> markdown
        cat markdown >> $GITHUB_OUTPUT
        echo "EOF" >> $GITHUB_OUTPUT
    - name: 'Post comment'
      uses: edumserrano/find-create-or-update-comment@v3
      with:
        issue-number: ${{ github.event.pull_request.number }}
        body-includes: '<!-- workflow-benchmarks-size-data -->'
        comment-author: 'github-actions[bot]'
        body: |
          <!-- workflow-benchmarks-size-data -->
          ### workflow: benchmarks/size
          Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.
          ${{ steps.collect.outputs.table }}
        edit-mode: replace

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.
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.

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 2 jobs per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout actions/setup-node