Knowledge Base
Load Generators

Load Generators

HttpArena uses a different load generator for each transport / workload.

HTTP/1.1
gcannon (io_uring) for most tests, wrk for static file serving.
HTTP/2
h2load — nghttp2’s load generator with TLS and stream multiplexing.
HTTP/3
h2load-h3 — nghttp2 + ngtcp2 for QUIC-based HTTP/3 benchmarks.
gRPC
ghz — proto-aware gRPC load tester for streaming and unary RPCs.
WebSocket
gcannon –ws — io_uring WebSocket echo driver reusing the HTTP/1.1 engine with a frame-aware send/recv loop.