wifi-densepose/vendor/midstream/crates/quic-multistream/benches

QUIC Multi-Stream Benchmarks

Comprehensive performance benchmarks for the quic-multistream crate covering all critical aspects of QUIC protocol performance.

Overview

This benchmark suite provides 826 lines of production-grade performance tests organized into 6 major categories with realistic workloads.

Benchmark Categories

1. Stream Throughput (benchmark_stream_throughput)

Target: >100 MB/s per stream

Measures single stream data transfer performance across various payload sizes:

• 100 bytes: Small message performance (chat, control messages)
• 10 KB: Medium messages (API responses, JSON payloads)
• 100 KB: Large messages (images, documents)
• 1 MB: Bulk data transfer (video chunks, file uploads)

Operations tested:

• Unidirectional send
• Unidirectional receive
• Bidirectional send/receive

2. Stream Multiplexing (benchmark_stream_multiplexing)

Target: >50 concurrent streams

Tests concurrent stream handling capabilities:

• 10 streams: Light multiplexing
• 50 streams: Moderate multiplexing (target baseline)
• 100 streams: Heavy multiplexing
• 500 streams: Stress test

Scenarios:

• Uniform workload (all streams same size)
• Mixed workload (varied message sizes)
• Concurrent stream lifecycle management

3. Connection Establishment (benchmark_connection_establishment)

Target: <10ms for 1-RTT, <1ms for 0-RTT

Benchmarks connection handshake performance:

• 0-RTT handshake: Instant connection (session resumption)
• 1-RTT handshake: Standard TLS 1.3 handshake
• Varying RTT: 50μs to 5ms round-trip times
• Connection + immediate data: Handshake with piggybacked data

4. Backpressure Handling (benchmark_backpressure_handling)

Target: <100ms recovery time

Tests flow control and congestion management:

• Buffer fill/drain cycles: Memory pressure handling
• Concurrent backpressure: Multi-stream flow control
• Chunked sending: Smart data segmentation (64 KB chunks)
• Buffer overflow recovery: Graceful degradation

5. Priority Queue Performance (benchmark_priority_queue)

Target: <50μs priority switching

Evaluates stream prioritization efficiency:

• Priority enqueue: Adding streams to priority queue
• Priority dequeue: Retrieving highest priority streams
• Mixed priority streams: 4-level priority handling (Critical, High, Normal, Low)
• Priority switching: Dynamic priority changes during stream lifetime

6. Native Performance Characteristics (benchmark_native_characteristics)

Target: Establish baseline metrics

Platform-specific performance patterns:

• Small allocations: Many small buffers (100 bytes × 100 streams)
• Large allocations: Bulk memory (10 MB single allocation)
• Connection pooling: Reusing connections across requests
• Statistics collection: Monitoring overhead (1000 stat calls)

Running Benchmarks

Quick Start

# Run all benchmarks
cd crates/quic-multistream
cargo bench --bench quic_bench

# Run specific category
cargo bench --bench quic_bench stream_throughput
cargo bench --bench quic_bench multiplexing
cargo bench --bench quic_bench connection
cargo bench --bench quic_bench backpressure
cargo bench --bench quic_bench priority
cargo bench --bench quic_bench native

Advanced Usage

# Save baseline for comparison
cargo bench --bench quic_bench -- --save-baseline main

# Compare against baseline
cargo bench --bench quic_bench -- --baseline main

# Generate HTML reports
cargo bench --bench quic_bench
open target/criterion/*/report/index.html

# Run with specific sample size
cargo bench --bench quic_bench -- --sample-size 200

# Profile specific benchmark
cargo bench --bench quic_bench stream_throughput -- --profile-time 20

Performance Targets Summary

Category	Metric	Target	Importance
Stream Throughput	Single stream	>100 MB/s	Critical
Multiplexing	Concurrent streams	>50 streams	Critical
Connection	0-RTT latency	<1ms	High
Connection	1-RTT latency	<10ms	High
Backpressure	Recovery time	<100ms	Medium
Priority Queue	Switch overhead	<50μs	Medium
Statistics	Collection overhead	<10μs	Low

Benchmark Configuration

Throughput Benchmarks

• Sample size: 100
• Measurement time: 10 seconds
• Warm-up time: 3 seconds

Multiplexing Benchmarks

• Sample size: 50 (due to complexity)
• Measurement time: 15 seconds
• Warm-up time: 3 seconds

Connection Benchmarks

• Sample size: 200 (fast operations)
• Measurement time: 8 seconds
• Warm-up time: 2 seconds

Backpressure Benchmarks

• Sample size: 50 (resource intensive)
• Measurement time: 12 seconds
• Warm-up time: 3 seconds

Priority Benchmarks

• Sample size: 100
• Measurement time: 10 seconds
• Warm-up time: 2 seconds

Native Benchmarks

• Sample size: 100
• Measurement time: 10 seconds
• Warm-up time: Default

Mock Implementation Details

The benchmarks use a sophisticated mock implementation that simulates realistic QUIC behavior:

MockConnection Features

• RTT simulation: Configurable round-trip time (50μs - 5ms)
• Stream tracking: Active stream count monitoring
• Priority queue: Binary heap for stream prioritization
• Backpressure buffer: 1 MB buffer with overflow detection
• Statistics: Real-time connection metrics

MockStream Features

• Network delay: RTT-based delay + transmission time
• Packet simulation: 64 KB max packet size (QUIC standard)
• Priority levels: 4-tier priority system
• Chunked transfer: Configurable chunk sizes
• Graceful cleanup: RAII-based resource management

Interpreting Results

Criterion Output

stream_throughput/send/1MB
                        time:   [10.234 ms 10.456 ms 10.678 ms]
                        thrpt:  [95.83 MiB/s 97.92 MiB/s 100.01 MiB/s]

• time: Median execution time with confidence interval
• thrpt: Throughput (higher is better)

HTML Reports

Criterion generates interactive HTML reports at:

target/criterion/<benchmark_name>/report/index.html

Features:

• Line plots showing performance over time
• Violin plots for distribution analysis
• Regression detection
• Historical comparisons

CI/CD Integration

GitHub Actions Example

name: QUIC Benchmarks

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  benchmark:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Install Rust
        uses: actions-rs/toolchain@v1
        with:
          toolchain: stable

      - name: Run benchmarks
        run: |
          cd crates/quic-multistream
          cargo bench --bench quic_bench -- --save-baseline ci          

      - name: Upload results
        uses: actions/upload-artifact@v3
        with:
          name: benchmark-results
          path: target/criterion/

Comparison with Other Implementations

vs. quinn (Native QUIC)

• Mock benchmarks run 10-100x faster (no network I/O)
• Use for algorithm optimization, not absolute performance
• Real-world tests needed for production validation

vs. WebTransport (WASM)

• Native expected to be 2-5x faster than WASM
• WASM lacks 0-RTT support in most browsers
• Different workload characteristics on web platforms

Optimization Tips

Based on Benchmark Results

1. High throughput needed?

   • Use larger message sizes (>10 KB)
   • Enable chunked transfer for >1 MB
   • Consider connection pooling

2. Many concurrent streams?

   • Monitor backpressure buffer
   • Use priority queues strategically
   • Implement stream recycling

3. Low latency critical?

   • Use 0-RTT when possible
   • Minimize handshake overhead
   • Reduce buffer sizes

4. Limited bandwidth?

   • Aggressive backpressure handling
   • Priority-based scheduling
   • Adaptive chunk sizing

Future Enhancements

• Add WASM-specific benchmarks
• Network simulation (packet loss, jitter)
• Comparative benchmarks vs HTTP/2, HTTP/3
• Memory profiling integration
• CPU profiling with flamegraphs
• Real-world workload patterns (video streaming, file transfer)

References

• Criterion.rs Documentation
• QUIC Specification (RFC 9000)
• Quinn Implementation
• WebTransport Specification

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Created: 2025-10-26 Lines: 826 Categories: 6 Benchmarks: 30+ Status: ✅ Production Ready