HTTP Load Profiler — Stepped Concurrency Load Test + Inflection Point Analysis

Run stepped concurrency load tests against HTTP services, automatically collect latency percentiles, and detect performance inflection points.

Features

Dual engine support: Auto-detects wrk (preferred) or ab (Apache Bench); manual override available
Stepped concurrency: Ramps up through user-defined concurrency levels (default: 1 → 10 → 50 → 100 → 200 → 500)
Latency percentiles: Collects p50 / p90 / p99 latency at each level
Inflection point detection: Automatically identifies four types of performance inflection points
- p99 latency accelerating (increase exceeds 2x the previous step's increase)
- Throughput efficiency dropping significantly (RPS per connection drops > 40%)
- Throughput saturated while latency spikes (RPS growth < 10%, p99 growth > 50%)
- Error rate surging (exceeds 1% and doubles from previous step)
Optimal concurrency recommendation: Automatically suggests the best concurrency level based on inflection points
Zero Python dependencies: Pure standard library implementation