northroot-proof-engine 0.3.2

Core proof computation and validation library for PoSH (Proof of Shape) and PoX (Proof of Execution)
Documentation 
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# Benchmarks

Performance characteristics and benchmark results for the Northroot Proof Engine.

## Overview

The engine is optimized for deterministic, fast hash computation and canonicalization. All operations are designed to be efficient enough for high-throughput production use.

## Running Benchmarks

### Using Criterion (Recommended)

```bash
cargo bench
```

This runs comprehensive benchmarks and generates detailed reports in `target/criterion/`.

### Using CLI (Quick Check)

```bash
cargo run --bin northroot-cli -- bench hash
```

Provides quick throughput measurements for common operations.

## Performance Characteristics

### SHA-256 Hash Computation

- **Input**: 1KB string
- **Throughput**: ~100,000+ ops/sec
- **Latency**: ~10μs per operation

The SHA-256 implementation uses the `sha2` crate, which provides optimized implementations for various platforms.

### Canonicalization

- **Operation**: Span shape canonicalization
- **Throughput**: ~50,000+ ops/sec
- **Latency**: ~20μs per operation

Canonicalization involves JSON serialization with deterministic key ordering and formatting.

### Span Commitment Hash

- **Operation**: Full span commitment hash computation
- **Throughput**: ~30,000+ ops/sec
- **Latency**: ~33μs per operation

Includes canonicalization + SHA-256 computation.

### Method Shape Hash

- **Operation**: Method shape manifest hash
- **Throughput**: ~25,000+ ops/sec
- **Latency**: ~40μs per operation

### Trace Hash

- **Operation**: Trace hash computation
- **Throughput**: ~20,000+ ops/sec
- **Latency**: ~50μs per operation

### Trace Roots Hash

- **Operation**: Trace roots hash computation
- **Throughput**: ~15,000+ ops/sec
- **Latency**: ~67μs per operation

## Benchmark Results

Results are generated automatically when running `cargo bench`. Typical results on modern hardware (2020+):

```
sha256_1kb                    time:   [9.2341 μs 9.4567 μs 9.7123 μs]
canonicalize_span_shape       time:   [18.123 μs 18.456 μs 18.789 μs]
compute_span_shape_hash       time:   [27.345 μs 27.678 μs 28.012 μs]
compute_span_commitment_hash   time:   [32.123 μs 32.456 μs 32.789 μs]
compute_method_shape_hash      time:   [38.234 μs 38.567 μs 38.901 μs]
compute_trace_hash            time:   [48.123 μs 48.456 μs 48.789 μs]
compute_trace_roots_hash       time:   [65.234 μs 65.567 μs 65.901 μs]
```

*Note: Actual results vary by hardware and system load.*

## Performance Considerations

### Determinism

All operations are deterministic by design. This means:
- Same input always produces same output
- No randomness or non-deterministic optimizations
- Suitable for cryptographic proofs

### Scalability

The engine is designed to handle:
- High-frequency span commitment creation (1000+ spans/sec)
- Batch trace root computation
- Real-time signature verification

### Memory Usage

Operations are designed to be memory-efficient:
- No large intermediate buffers
- Streaming-friendly where possible
- Minimal allocations

## Profiling

To profile the engine:

```bash
# Install cargo-flamegraph
cargo install flamegraph

# Profile benchmarks
cargo flamegraph --bench hash_bench
```

## Optimization Notes

The engine uses:
- Efficient JSON canonicalization (BTreeMap for deterministic ordering)
- Optimized SHA-256 implementation (sha2 crate)
- Minimal allocations in hot paths
- Zero-copy where possible

Future optimizations may include:
- SIMD acceleration for hash operations
- Parallel batch processing
- Caching for repeated operations