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wrk is a modern, command-line HTTP benchmarking tool engineered for high performance, capable of generating substantial load using a single multi-core CPU by leveraging multithreading and scalable event notification systems. An optional LuaJIT script can perform HTTP request generation, response processing, and custom reporting. Details are available in SCRIPTING and several examples are located in scripts. The machine running wrk must have a sufficient number of ephemeral ports available and closed sockets should be recycled quickly. To handle the initial connection burst the server's listen(2) backlog should be greater than the number of concurrent connections being tested.
Features
- Multithreaded design for concurrent benchmarking using multiple cores
- Uses efficient event notification backends like epoll and kqueue
- Supports LuaJIT scripting for custom request generation and output processing
- Effective at simulating heavy load on web servers
- Simple command-line interface with powerful configuration options
- Widely used for stress‑testing real‑world HTTP services
Project Samples
Categories
BenchmarkLicense
MIT LicenseFollow wrk
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