# Benchmark workflow (swc-project/swc)

> The Benchmark workflow from swc-project/swc, explained and optimized by Latchkey.

Source: https://latchkey.dev/workflows/swc-project-swc-bench  
Upstream: [swc-project/swc](https://github.com/swc-project/swc/blob/main/.github/workflows/bench.yml) (.github/workflows/bench.yml), licence Apache-2.0

## What it does

This is the Benchmark workflow from the swc-project/swc repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

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

## The workflow

```yaml
name: Benchmark

on:
  push:
    branches:
      - main
  pull_request:
    types: ["opened", "reopened", "synchronize"]

concurrency:
  # Do not block on main branch
  group: ${{ github.event_name == 'pull_request' && format('{0}-{1}', github.workflow, github.event.pull_request.number) || format('{0}-{1}-{2}', github.workflow, github.ref_name, github.run_id) }}
  cancel-in-progress: ${{ github.event_name == 'pull_request' }}

env:
  CI: 1
  CARGO_INCREMENTAL: 0
  CARGO_TERM_COLOR: "always"
  DIFF: 0
  # For faster CI
  RUST_LOG: "off"
  # https://github.com/swc-project/swc/pull/3742
  RUST_MIN_STACK: 4194304
  CARGO_PROFILE_RELEASE_LTO: false
  CARGO_PROFILE_BENCH_LTO: false

permissions: {}

jobs:
  list-crates:
    if: >-
      ${{ !contains(github.event.head_commit.message, 'chore: ') }}
    name: List crates to benchmark
    runs-on: ubuntu-22.04
    permissions:
      contents: read
    outputs:
      crates: ${{ steps.list-crates.outputs.crates }}
    steps:
      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          persist-credentials: false

      - name: List crates
        id: list-crates
        run: echo "crates=$(./scripts/bench/list-crates-with-bench.sh)" >> $GITHUB_OUTPUT

  benchmark-crate:
    name: Benchmark ${{ matrix.crate }}
    runs-on: ubuntu-22.04
    permissions:
      contents: read
    needs: list-crates
    strategy:
      matrix:
        crate: ${{fromJson(needs.list-crates.outputs.crates)}}
    steps:
      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
        with:
          persist-credentials: false

      - name: Install Rust
        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable

      - uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2.9.1
        # Some crates are too slow to build
        if: matrix.crate == 'swc'
        with:
          shared-key: "bench-${{ matrix.crate }}"
          key: "bench-${{ matrix.crate }}"
          cache-all-crates: true
          save-if: ${{ github.ref == 'refs/heads/main' }}

      - name: Install cargo-codspeed
        uses: taiki-e/install-action@3235f8901fd37ffed0052b276cec25a362fb82e9 # v2.77.7
        with:
          tool: cargo-codspeed@3.0.2

      - name: Build the benchmark target(s)
        run: ./scripts/bench/build-crate.sh ${{ matrix.crate }}

      - name: Run the benchmarks
        uses: CodSpeedHQ/action@76578c2a7ddd928664caa737f0e962e3085d4e7c # v3.8.1
        with:
          run: cargo codspeed run
          token: ${{ secrets.CODSPEED_TOKEN }}
```

## FAQ

### What does the Benchmark workflow (swc-project/swc) workflow do?

This is the Benchmark workflow from the swc-project/swc repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

### What CI health grade does this workflow get?

This Automation and other workflow grades A. Paste your own workflow into the Latchkey grader to see its grade and the exact fixes.

### How can I improve this Automation and other workflow?

Add job timeouts. Latchkey applies these automatically on managed runners when you point runs-on at Latchkey.

---

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