296 lines
8.6 KiB
Markdown
296 lines
8.6 KiB
Markdown
# QUIC Multi-Stream Benchmarks
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Comprehensive performance benchmarks for the `quic-multistream` crate covering all critical aspects of QUIC protocol performance.
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## Overview
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This benchmark suite provides **826 lines** of production-grade performance tests organized into 6 major categories with realistic workloads.
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## Benchmark Categories
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### 1. Stream Throughput (`benchmark_stream_throughput`)
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**Target**: >100 MB/s per stream
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Measures single stream data transfer performance across various payload sizes:
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- **100 bytes**: Small message performance (chat, control messages)
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- **10 KB**: Medium messages (API responses, JSON payloads)
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- **100 KB**: Large messages (images, documents)
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- **1 MB**: Bulk data transfer (video chunks, file uploads)
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**Operations tested**:
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- Unidirectional send
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- Unidirectional receive
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- Bidirectional send/receive
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### 2. Stream Multiplexing (`benchmark_stream_multiplexing`)
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**Target**: >50 concurrent streams
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Tests concurrent stream handling capabilities:
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- **10 streams**: Light multiplexing
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- **50 streams**: Moderate multiplexing (target baseline)
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- **100 streams**: Heavy multiplexing
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- **500 streams**: Stress test
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**Scenarios**:
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- Uniform workload (all streams same size)
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- Mixed workload (varied message sizes)
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- Concurrent stream lifecycle management
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### 3. Connection Establishment (`benchmark_connection_establishment`)
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**Target**: <10ms for 1-RTT, <1ms for 0-RTT
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Benchmarks connection handshake performance:
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- **0-RTT handshake**: Instant connection (session resumption)
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- **1-RTT handshake**: Standard TLS 1.3 handshake
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- **Varying RTT**: 50μs to 5ms round-trip times
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- **Connection + immediate data**: Handshake with piggybacked data
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### 4. Backpressure Handling (`benchmark_backpressure_handling`)
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**Target**: <100ms recovery time
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Tests flow control and congestion management:
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- **Buffer fill/drain cycles**: Memory pressure handling
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- **Concurrent backpressure**: Multi-stream flow control
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- **Chunked sending**: Smart data segmentation (64 KB chunks)
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- **Buffer overflow recovery**: Graceful degradation
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### 5. Priority Queue Performance (`benchmark_priority_queue`)
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**Target**: <50μs priority switching
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Evaluates stream prioritization efficiency:
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- **Priority enqueue**: Adding streams to priority queue
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- **Priority dequeue**: Retrieving highest priority streams
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- **Mixed priority streams**: 4-level priority handling (Critical, High, Normal, Low)
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- **Priority switching**: Dynamic priority changes during stream lifetime
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### 6. Native Performance Characteristics (`benchmark_native_characteristics`)
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**Target**: Establish baseline metrics
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Platform-specific performance patterns:
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- **Small allocations**: Many small buffers (100 bytes × 100 streams)
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- **Large allocations**: Bulk memory (10 MB single allocation)
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- **Connection pooling**: Reusing connections across requests
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- **Statistics collection**: Monitoring overhead (1000 stat calls)
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## Running Benchmarks
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### Quick Start
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```bash
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# Run all benchmarks
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cd crates/quic-multistream
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cargo bench --bench quic_bench
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# Run specific category
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cargo bench --bench quic_bench stream_throughput
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cargo bench --bench quic_bench multiplexing
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cargo bench --bench quic_bench connection
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cargo bench --bench quic_bench backpressure
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cargo bench --bench quic_bench priority
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cargo bench --bench quic_bench native
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```
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### Advanced Usage
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```bash
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# Save baseline for comparison
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cargo bench --bench quic_bench -- --save-baseline main
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# Compare against baseline
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cargo bench --bench quic_bench -- --baseline main
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# Generate HTML reports
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cargo bench --bench quic_bench
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open target/criterion/*/report/index.html
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# Run with specific sample size
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cargo bench --bench quic_bench -- --sample-size 200
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# Profile specific benchmark
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cargo bench --bench quic_bench stream_throughput -- --profile-time 20
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```
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## Performance Targets Summary
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| Category | Metric | Target | Importance |
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|----------|--------|--------|------------|
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| **Stream Throughput** | Single stream | >100 MB/s | Critical |
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| **Multiplexing** | Concurrent streams | >50 streams | Critical |
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| **Connection** | 0-RTT latency | <1ms | High |
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| **Connection** | 1-RTT latency | <10ms | High |
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| **Backpressure** | Recovery time | <100ms | Medium |
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| **Priority Queue** | Switch overhead | <50μs | Medium |
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| **Statistics** | Collection overhead | <10μs | Low |
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## Benchmark Configuration
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### Throughput Benchmarks
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- **Sample size**: 100
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- **Measurement time**: 10 seconds
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- **Warm-up time**: 3 seconds
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### Multiplexing Benchmarks
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- **Sample size**: 50 (due to complexity)
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- **Measurement time**: 15 seconds
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- **Warm-up time**: 3 seconds
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### Connection Benchmarks
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- **Sample size**: 200 (fast operations)
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- **Measurement time**: 8 seconds
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- **Warm-up time**: 2 seconds
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### Backpressure Benchmarks
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- **Sample size**: 50 (resource intensive)
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- **Measurement time**: 12 seconds
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- **Warm-up time**: 3 seconds
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### Priority Benchmarks
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- **Sample size**: 100
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- **Measurement time**: 10 seconds
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- **Warm-up time**: 2 seconds
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### Native Benchmarks
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- **Sample size**: 100
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- **Measurement time**: 10 seconds
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- **Warm-up time**: Default
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## Mock Implementation Details
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The benchmarks use a sophisticated mock implementation that simulates realistic QUIC behavior:
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### MockConnection Features
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- **RTT simulation**: Configurable round-trip time (50μs - 5ms)
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- **Stream tracking**: Active stream count monitoring
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- **Priority queue**: Binary heap for stream prioritization
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- **Backpressure buffer**: 1 MB buffer with overflow detection
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- **Statistics**: Real-time connection metrics
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### MockStream Features
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- **Network delay**: RTT-based delay + transmission time
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- **Packet simulation**: 64 KB max packet size (QUIC standard)
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- **Priority levels**: 4-tier priority system
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- **Chunked transfer**: Configurable chunk sizes
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- **Graceful cleanup**: RAII-based resource management
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## Interpreting Results
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### Criterion Output
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```
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stream_throughput/send/1MB
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time: [10.234 ms 10.456 ms 10.678 ms]
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thrpt: [95.83 MiB/s 97.92 MiB/s 100.01 MiB/s]
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```
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- **time**: Median execution time with confidence interval
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- **thrpt**: Throughput (higher is better)
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### HTML Reports
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Criterion generates interactive HTML reports at:
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```
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target/criterion/<benchmark_name>/report/index.html
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```
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Features:
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- Line plots showing performance over time
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- Violin plots for distribution analysis
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- Regression detection
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- Historical comparisons
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## CI/CD Integration
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### GitHub Actions Example
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```yaml
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name: QUIC Benchmarks
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on:
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push:
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branches: [main]
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pull_request:
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branches: [main]
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jobs:
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benchmark:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- name: Install Rust
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uses: actions-rs/toolchain@v1
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with:
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toolchain: stable
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- name: Run benchmarks
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run: |
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cd crates/quic-multistream
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cargo bench --bench quic_bench -- --save-baseline ci
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- name: Upload results
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uses: actions/upload-artifact@v3
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with:
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name: benchmark-results
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path: target/criterion/
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```
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## Comparison with Other Implementations
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### vs. quinn (Native QUIC)
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- Mock benchmarks run **10-100x faster** (no network I/O)
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- Use for algorithm optimization, not absolute performance
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- Real-world tests needed for production validation
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### vs. WebTransport (WASM)
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- Native expected to be **2-5x faster** than WASM
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- WASM lacks 0-RTT support in most browsers
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- Different workload characteristics on web platforms
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## Optimization Tips
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### Based on Benchmark Results
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1. **High throughput needed?**
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- Use larger message sizes (>10 KB)
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- Enable chunked transfer for >1 MB
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- Consider connection pooling
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2. **Many concurrent streams?**
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- Monitor backpressure buffer
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- Use priority queues strategically
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- Implement stream recycling
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3. **Low latency critical?**
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- Use 0-RTT when possible
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- Minimize handshake overhead
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- Reduce buffer sizes
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4. **Limited bandwidth?**
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- Aggressive backpressure handling
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- Priority-based scheduling
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- Adaptive chunk sizing
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## Future Enhancements
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- [ ] Add WASM-specific benchmarks
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- [ ] Network simulation (packet loss, jitter)
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- [ ] Comparative benchmarks vs HTTP/2, HTTP/3
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- [ ] Memory profiling integration
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- [ ] CPU profiling with flamegraphs
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- [ ] Real-world workload patterns (video streaming, file transfer)
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## References
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- [Criterion.rs Documentation](https://bheisler.github.io/criterion.rs/book/)
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- [QUIC Specification (RFC 9000)](https://www.rfc-editor.org/rfc/rfc9000.html)
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- [Quinn Implementation](https://github.com/quinn-rs/quinn)
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- [WebTransport Specification](https://w3c.github.io/webtransport/)
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---
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**Created**: 2025-10-26
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**Lines**: 826
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**Categories**: 6
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**Benchmarks**: 30+
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**Status**: ✅ Production Ready
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