performance.yml

name: Performance Analysis

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  schedule:
    - cron: '0 2 * * 0'  # Weekly on Sunday at 2 AM

jobs:
  benchmark:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            cmake \
            pkg-config \
            libcriterion-dev \
            clang-18 \
            linux-tools-generic \
            valgrind \
            time

      - name: Build optimized version
        run: |
          cmake -B build \
            -DCMAKE_BUILD_TYPE=Release \
            -DCMAKE_C_COMPILER=clang-18 \
            -DCMAKE_C_FLAGS="-O3 -march=native -fno-omit-frame-pointer"
          cmake --build build --parallel

      - name: Run benchmarks
        run: |
          # Multiple runs for statistical significance
          for i in {1..5}; do
            echo "=== Run $i ===" >> benchmark-results.txt
            ./build/bin/mg_benchmarks >> benchmark-results.txt
          done

      - name: Performance regression check
        run: |
          # Simple performance regression detection
          # In real usage, you'd compare against baseline
          LATEST_TIME=$(tail -10 benchmark-results.txt | grep "Graph creation" | tail -1 | awk '{print $4}')
          echo "Latest graph creation time: $LATEST_TIME µs"

          # Alert if performance degrades significantly (>20% slower than 2µs baseline)
          if (( $(echo "$LATEST_TIME > 2.4" | bc -l) )); then
            echo "::warning::Performance regression detected: $LATEST_TIME µs > 2.4 µs baseline"
          fi

      - name: Upload benchmark results
        uses: actions/upload-artifact@v4
        with:
          name: benchmark-results
          path: benchmark-results.txt

  memory-profile:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            cmake \
            pkg-config \
            libcriterion-dev \
            clang-18 \
            valgrind

      - name: Build with debug info
        run: |
          cmake -B build \
            -DCMAKE_BUILD_TYPE=RelWithDebInfo \
            -DCMAKE_C_COMPILER=clang-18 \
            -DMETAGRAPH_SANITIZERS=OFF  # Disable for Valgrind
          cmake --build build --parallel

      - name: Memory leak detection
        run: |
          valgrind --tool=memcheck \
            --leak-check=full \
            --show-leak-kinds=all \
            --track-origins=yes \
            --error-exitcode=1 \
            --log-file=valgrind-memcheck.log \
            ./build/bin/mg_unit_tests

      - name: Cache performance analysis
        run: |
          valgrind --tool=cachegrind \
            --cache-sim=yes \
            --branch-sim=yes \
            --cachegrind-out-file=cachegrind.out \
            ./build/bin/mg_benchmarks

      - name: Upload memory analysis
        uses: actions/upload-artifact@v4
        with:
          name: memory-analysis
          path: |
            valgrind-memcheck.log
            cachegrind.out

  fuzzing:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y cmake pkg-config clang-18

      - name: Build fuzzing targets
        run: |
          cmake -B build \
            -DCMAKE_BUILD_TYPE=Debug \
            -DMETAGRAPH_FUZZING=ON \
            -DCMAKE_C_COMPILER=clang-18
          cmake --build build --parallel

      - name: Run continuous fuzzing
        run: |
          mkdir -p fuzz-corpus/{graph,node-ops}

          # Run fuzzing for 5 minutes
          timeout 300 ./build/tests/fuzz/fuzz_graph \
            -max_total_time=300 \
            -print_final_stats=1 \
            fuzz-corpus/graph/ || true

          timeout 300 ./build/tests/fuzz/fuzz_node_ops \
            -max_total_time=300 \
            -print_final_stats=1 \
            fuzz-corpus/node-ops/ || true

      - name: Upload fuzzing corpus
        uses: actions/upload-artifact@v4
        with:
          name: fuzz-corpus
          path: fuzz-corpus/

      - name: Check for crashes
        run: |
          # Check if any crash files were generated
          if find . -name "crash-*" -o -name "leak-*" -o -name "timeout-*" | grep -q .; then
            echo "::error::Fuzzing found crashes or issues!"
            find . -name "crash-*" -o -name "leak-*" -o -name "timeout-*" -exec echo "Found: {}" \;
            exit 1
          else
            echo "::notice::No crashes found during fuzzing"
          fi