# Bead bf-4h7f: Benchmark Framework Verification

## Task
Create benchmark framework and basic structure

## Status
**COMPLETE** - Framework already fully implemented and verified working

## Deliverables Verified

### 1. Criterion benchmark dependency
- **Status**: ✅ Already present
- **Location**: `Cargo.toml` line 123
- **Version**: `criterion = "0.5"`
- **Benchmark harness**: Configured in `Cargo.toml` lines 125-127

### 2. Benchmark file
- **Status**: ✅ Already exists
- **Location**: `benches/sanitize.rs`
- **Size**: 25,041 bytes (comprehensive implementation)

### 3. Basic benchmark function skeleton
- **Status**: ✅ Fully implemented with comprehensive benchmarks
- **Functions defined**:
  - `bench_sanitize_10kb` - Throughput benchmark for 10KB traces
  - `bench_sanitize_100kb` - Throughput benchmark for 100KB traces
  - `bench_sanitize_1mb` - Throughput benchmark for 1MB traces
  - `bench_latency_10kb` - Detailed latency statistics for 10KB
  - `bench_latency_100kb` - Detailed latency statistics for 100KB
  - `bench_latency_1mb` - Detailed latency statistics for 1MB
  - `bench_median_latency` - Median latency measurement
  - `report_skip_stats` - Aho-Corasick pre-filter skip rate statistics
  - `generate_trace_content` - Deterministic test data generator
  - `measure_latency_stats` - Latency measurement helper
  - `measure_median_latency_100kb` - Median latency measurement
  - `assertion_test` - Performance assertion test

### 4. Benchmark execution verification
- **Status**: ✅ Compiles and runs successfully
- **Test results** (2024-06-25):
  - 10KB throughput: 669-743 µs (13-14 MiB/s)
  - 100KB throughput: 7.3-7.9 ms (12-13 MiB/s) - **Meets <10ms threshold** ✅
  - 1MB throughput: 72-76 ms (13-14 MiB/s)
  - Median latency (100KB): 6.7-7.2 ms - **Well under 10ms threshold** ✅

## Additional Features Already Implemented

The existing implementation includes features beyond the basic requirements:

1. **Comprehensive test data generation**: `generate_trace_content()` creates realistic Claude trace JSONL data with deterministic output
2. **Multiple benchmark types**: Throughput, latency, and skip-rate statistics
3. **Assertion tests**: Performance regression test with configurable threshold
4. **Environment variable configuration**: `SANITIZER_LATENCY_THRESHOLD_MS`, `SANITIZER_BENCH_SAMPLE_COUNT`
5. **Integration tests**: Unit tests for generator determinism and pattern coverage
6. **Comprehensive documentation**: Usage instructions, success criteria, and inline comments

## Conclusion

All acceptance criteria have been met. The benchmark framework was already fully implemented in the codebase and verified to be working correctly. No changes were needed.
