wrk2 extends wrk with a constant request rate and coordinated-omission-aware latency measurements. It is useful for controlled HTTP service benchmarks.
About
wrk2 is a variant of the HTTP benchmarking tool wrk, modified to produce constant throughput load and provide accurate latency measurements to avoid coordinated omission.
Features
- Constant throughput load generation
- Accurate latency measurement to high 9s (e.g., 99.9999%'ile) using HdrHistograms
- Addresses coordinated omission issues found in traditional load generators
- Maintains compatibility with wrk's Lua API
- Supports multi-threaded load generation
Pricing
Free and open source
Author / Company
Gil Tene
AI features
- Constant throughput load generation
- Accurate latency recording using HdrHistograms
- Support for --rate or -R parameters to control throughput (default 1000 requests per second)
- Full compatibility with wrk's Lua API for custom request generation and response processing
- Detailed percentile spectra reporting with the --latency flag
Sources
GROUNDED VIA EXA · 2026-08-11