wrk2
A constant throughput HTTP benchmarking tool with accurate latency measurement using HdrHistogram to avoid coordinated omission.
What is wrk2?
wrk2 is a specialized HTTP benchmarking tool that generates constant throughput load while providing accurate latency measurements. It solves the problem of coordinated omission—where traditional load generators miss high-latency events by waiting for slow responses before sending new requests. By measuring latency from when requests should have been sent according to a constant rate plan, wrk2 reveals true server performance characteristics.
Performance engineers, DevOps professionals, and backend developers who need accurate latency measurements for HTTP services under consistent load. It's particularly valuable for teams diagnosing tail latency issues or validating service-level objectives (SLOs).
Developers choose wrk2 over other benchmarking tools because it provides mathematically correct latency measurements that account for coordinated omission. Unlike wrk and similar tools that can dramatically underreport high percentiles during server slowdowns, wrk2's constant throughput approach with HdrHistogram recording ensures latency distributions reflect actual user experience.
Overview
A constant throughput, correct latency recording variant of wrk
Use Cases
Best For
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