# Performance Regression Detection - Quick Start

**Goal**: Track performance and automatically fail CI on >10% regression

## Quick Commands

### 1. Record Baseline (First Time)

```bash
# DQN baseline
cargo run --release -p ml --example quick_performance_benchmark -- \
  --output ml/benchmark_results/dqn_baseline.json \
  --git-commit $(git rev-parse HEAD) \
  --model DQN

# PPO baseline
cargo run --release -p ml --example quick_performance_benchmark -- \
  --output ml/benchmark_results/ppo_baseline.json \
  --git-commit $(git rev-parse HEAD) \
  --model PPO

# MAMBA-2 baseline
cargo run --release -p ml --example quick_performance_benchmark -- \
  --output ml/benchmark_results/mamba2_baseline.json \
  --git-commit $(git rev-parse HEAD) \
  --model MAMBA-2

# TFT baseline
cargo run --release -p ml --example quick_performance_benchmark -- \
  --output ml/benchmark_results/tft_baseline.json \
  --git-commit $(git rev-parse HEAD) \
  --model TFT
```

### 2. Check for Regression (CI)

```bash
# Run current benchmark
cargo run --release -p ml --example quick_performance_benchmark -- \
  --output ml/benchmark_results/current.json \
  --git-commit $(git rev-parse HEAD) \
  --model DQN

# Check against baseline
cargo run --release -p ml --example check_performance_regression -- \
  --baseline ml/benchmark_results/dqn_baseline.json \
  --current ml/benchmark_results/current.json \
  --output regression_report.md

# Exit code 0 = Pass
# Exit code 1 = Fail (regression detected)
```

### 3. Run Tests

```bash
cargo test -p ml --test performance_regression_tests
```

### 4. Import Grafana Dashboard

```bash
# Copy dashboard JSON
cp ml/grafana/performance_tracking_dashboard.json /var/lib/grafana/dashboards/

# Or import via UI:
# Grafana → Dashboards → Import → Upload JSON
# File: ml/grafana/performance_tracking_dashboard.json
```

## Metrics Tracked

| Metric | Target | Model-Specific |
|--------|--------|----------------|
| DBN Load Time | <10ms | No |
| Feature Extraction | - | No |
| Training Step | - | Yes (100ms-500ms) |
| Inference Latency | <50μs | Yes (40μs-55μs) |
| Throughput | - | Yes |
| Memory Usage | - | Yes (150MB-2GB) |

## Regression Threshold

**10%** = Any metric that degrades by >10% fails the build

Examples:
- ✅ PASS: 0.70ms → 0.75ms (7.1% slower)
- ❌ FAIL: 0.70ms → 0.81ms (15.7% slower)

## CI Integration

Add to PR workflow:

```yaml
# .github/workflows/ci.yml
- name: Performance Check
  run: |
    # Record current metrics
    cargo run --release -p ml --example quick_performance_benchmark -- \
      --output current.json \
      --git-commit ${{ github.sha }} \
      --model DQN

    # Check regression
    cargo run --release -p ml --example check_performance_regression -- \
      --baseline baseline.json \
      --current current.json \
      --output report.md

    # Exit code 1 fails the build
```

## Grafana Setup

1. **Import Dashboard**:
   - Go to http://localhost:3000
   - Dashboards → Import
   - Upload `ml/grafana/performance_tracking_dashboard.json`

2. **Configure Prometheus**:
   ```yaml
   # prometheus.yml
   scrape_configs:
     - job_name: 'ml-performance'
       static_configs:
         - targets: ['localhost:9094']
   ```

3. **View Metrics**:
   - DBN Load Time
   - Inference Latency (by model)
   - Training Step Time
   - Memory Usage
   - Regression Count

## Troubleshooting

### Test Failures

```bash
# Run specific test
cargo test -p ml test_detect_regression_above_threshold -- --nocapture

# Verbose logging
RUST_LOG=debug cargo test -p ml --test performance_regression_tests
```

### Baseline Missing

```bash
# Create baseline if it doesn't exist
cargo run --release -p ml --example quick_performance_benchmark -- \
  --output ml/benchmark_results/dqn_baseline.json \
  --git-commit $(git rev-parse HEAD) \
  --model DQN
```

### False Positives

If you see false regressions:

1. Check for system load during benchmark
2. Verify consistent hardware (CPU/GPU)
3. Run multiple times and average
4. Adjust threshold if needed:
   ```bash
   cargo run --release -p ml --example check_performance_regression -- \
     --baseline baseline.json \
     --current current.json \
     --output report.md \
     --threshold 15.0  # Use 15% instead of 10%
   ```

## Model-Specific Baselines

Each model has different performance characteristics:

```
DQN:      150MB memory, 100ms training, 45μs inference
PPO:      200MB memory, 150ms training, 50μs inference
MAMBA-2:  400MB memory, 200ms training, 40μs inference
TFT:      2GB memory,   500ms training, 55μs inference
```

Always use model-specific baselines:
```bash
--baseline ml/benchmark_results/dqn_baseline.json  # For DQN
--baseline ml/benchmark_results/ppo_baseline.json  # For PPO
```

## File Locations

```
ml/
├── src/benchmark/performance_tracker.rs          # Core implementation
├── tests/performance_regression_tests.rs         # Tests (12/12 passing)
├── examples/
│   ├── quick_performance_benchmark.rs            # Record metrics
│   └── check_performance_regression.rs           # Detect regressions
├── benchmark_results/
│   ├── dqn_baseline.json                         # DQN baseline
│   ├── ppo_baseline.json                         # PPO baseline
│   ├── mamba2_baseline.json                      # MAMBA-2 baseline
│   └── tft_baseline.json                         # TFT baseline
└── grafana/performance_tracking_dashboard.json   # Grafana dashboard
```

## Support

- **Documentation**: `ml/PERFORMANCE_TRACKING.md`
- **Tests**: `cargo test -p ml --test performance_regression_tests`
- **Examples**: `ml/examples/quick_performance_benchmark.rs`
- **CI Workflow**: `.github/workflows/performance.yml`