wrk: A Command-Line Tool for HTTP Load Testing Your API Endpoints

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wrk is a modern HTTP performance testing tool that runs on a single multi-core machine, using multiple threads and a scalable event loop to simulate heavy traffic without requiring a fleet of test servers. It helps developers answer key questions about API throughput, latency percentiles, and stability under sustained load. The tool is installed via Homebrew on macOS or built from source on Linux, and operates with simple flags for threads, connections, and test duration. Output metrics include requests per second, data transfer rate, and latency distribution — with the p99 figure being especially important for detecting tail latency issues. wrk is strictly a performance measurement tool and does not validate response correctness, status codes, or API contracts.

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