Add ci job

.github/workflows/bench.yml

@@ -0,0 +1,61 @@
+name: bench
+
+on:
+  pull_request:
+    paths:
+      - "libs/**"
+
+env:
+  POETRY_VERSION: "1.7.1"
+
+jobs:
+  baseline:
+    runs-on: ubuntu-latest
+    working-directory: libs/langgraph
+    name: "bench/baseline"
+    steps:
+      - uses: actions/checkout@v4
+        ref: main
+      - name: Set up Python 3.11 + Poetry ${{ env.POETRY_VERSION }}
+        if: steps.changed-files.outputs.all
+        uses: "./.github/actions/poetry_setup"
+        with:
+          python-version: "3.11"
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: bench
+      - name: Install dependencies
+        run: poetry install --with dev
+      - name: Run benchmarks
+        run: make bench
+      - name: Upload benchmark baseline
+        uses: actions/upload-artifact@v4
+        with:
+          name: bench-baseline.json
+          path: out/bench.json
+  compare:
+    runs_on: ubuntu-latest
+    working-directory: libs/langgraph
+    name: "bench/compare"
+    needs: [baseline]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.11 + Poetry ${{ env.POETRY_VERSION }}
+        if: steps.changed-files.outputs.all
+        uses: "./.github/actions/poetry_setup"
+        with:
+          python-version: "3.11"
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: bench
+      - name: Install dependencies
+        run: poetry install --with dev
+      - name: Run benchmarks
+        run: make bench
+      - name: Download benchmark baseline
+        uses: actions/download-artifact@v4
+        with:
+          name: bench-baseline.json
+          path: out
+      - name: Compare benchmarks
+        run: poetry run pyperf compare_to out/bench-baseline.json out/bench.json --table --group-by-speed >> $GITHUB_OUTPUT
+      - name: Annotation
+        run: echo "::notice file=libs/langgraph/bench/__main__.py::$GITHUB_OUTPUT"