Diff every Ruby PR's performance

Your CI profiles each Ruby PR with the open-source rperf profiler; prperf compares it against the base branch and reports on the Check Run, never blocking CI. Codecov for test coverage, but for performance.

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What it does

On every pull request, prperf runs your benchmark under rperf, compares it against the latest run on the base branch, and posts:

• a Check Run with base→head numbers — allocations, GC, time, CPU, RSS;
• a sticky PR comment, only when a threshold you set is exceeded;
• a flamegraph diff showing which method got heavier.

It never blocks CI and needs no secrets (OIDC upload). Public repositories need no App install — the action writes the Check Run with the workflow token. Private repositories install the prperf App so it can write the Check Run for them.

How you write it

One workflow, triggered on both push to the default branch (records the base) and pull_request (compared against it). You fill in only the highlighted command — the action measures it under rperf for you; everything else is copy-paste.

name: prperf
on:
  push: { branches: [main, master] }   # records the base (default branch)
  pull_request:                        # compared against the base
jobs:
  bench:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      id-token: write          # OIDC upload (no secrets)
      checks: write            # write the Check Run (public repos)
      pull-requests: write     # write the sticky comment (public repos)
    steps:
      - uses: actions/checkout@v6
      - uses: ruby/setup-ruby@v1
        with: { bundler-cache: true }
      - uses: rperf-dev/prperf-action@v1
        with:
          run: bin/rails runner ""   # ← the only line you fill in

Docs: prperf-action (inputs, thresholds, examples) · full manual (setup, writing benchmarks, reading results).

How it looks

One PR run shows up in three places. Every example below is the live prperf-sample #1, where a new feature quietly added ~45% more allocations — no login needed.