Add pytest-benchmark GitHub Actions workflow

.github/workflows/benchmark.yml

@@ -0,0 +1,55 @@
+name: Benchmark
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+env:
+  UV_FROZEN: true
+  UV_PYTHON: 3.14
+  RUST_VERSION: "1.90.0"
+
+jobs:
+  benchmark:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository.
+        uses: actions/checkout@v4
+
+      - name: Install UV.
+        uses: astral-sh/setup-uv@v6
+
+      - name: Install dependencies.
+        run: uv sync --group testing
+
+      - name: Compile.
+        run: uv pip install -v -e .
+        env:
+          RUST_BACKTRACE: 1
+
+      - name: Run Benchmarks.
+        run: uv run pytest . -m benchmark_main --benchmark-enable --benchmark-json=output.json
+
+      - name: Download previous benchmark data.
+        uses: actions/cache@v4
+        with:
+          path: ./benchmark-data
+          key: benchmark-${{ github.base_ref || github.ref_name }}
+
+      - name: Benchmark results.
+        uses: benchmark-action/github-action-benchmark@v1
+        with:
+          tool: 'pytest'
+          output-file-path: output.json
+          external-data-json-path: ./benchmark-data/output.json
+          summary-always: true
+          fail-on-alert: true
+          skip-fetch-gh-pages: true
+          save-data-file: ${{ github.event_name != 'pull_request' }}

pyproject.toml

@@ -60,6 +60,9 @@ all = [
 ]
 
 [tool.pytest.ini_options]
+markers = [
+    'benchmark_main: marks tests as main benchmarks to run selectively'
+]
 addopts = [
     '--benchmark-columns', 'min,mean,stddev,outliers,rounds,iterations',
     '--benchmark-disable',  # use --benchmark-enable

pytests/test_dag_cbor.py

@@ -101,11 +101,13 @@ def test_dag_cbor_decode(benchmark, data) -> None:
     _dag_cbor_roundtrip(benchmark, data)
 
 
+@pytest.mark.benchmark_main
 @pytest.mark.parametrize('data', load_json_data_fixtures(_REAL_DATA_DIR), ids=lambda data: data[0])
 def test_dag_cbor_encode_real_data(benchmark, data) -> None:
     _dag_cbor_encode(benchmark, data)
 
 
+@pytest.mark.benchmark_main
 @pytest.mark.parametrize('data', load_json_data_fixtures(_REAL_DATA_DIR), ids=lambda data: data[0])
 def test_dag_cbor_decode_real_data(benchmark, data) -> None:
     _dag_cbor_roundtrip(benchmark, data)
@@ -116,6 +118,7 @@ def test_dag_cbor_decode_fixtures(benchmark, data) -> None:
     _dag_cbor_decode(benchmark, data)
 
 
+@pytest.mark.benchmark_main
 def test_dag_cbor_decode_torture_cids(benchmark) -> None:
     dag_cbor = open(_TORTURE_CIDS_DAG_CBOR_PATH, 'rb').read()
     benchmark(libipld.decode_dag_cbor, dag_cbor)

pytests/test_decode_car.py

@@ -14,6 +14,7 @@ def car() -> bytes:
     return load_car_fixture(_DID, _REPO_CAR_PATH)
 
 
+@pytest.mark.benchmark_main
 def test_decode_car(benchmark, car) -> None:
     header, blocks = benchmark(libipld.decode_car, car)