Developer builds Go message broker hitting one million messages per second

A software developer has built HermitMQ, an open-source message broker written entirely in Go, capable of processing over one million messages per second. To avoid garbage collector overhead, the project replaces standard JSON serialization with a compact custom 29-byte binary protocol, keeping memory allocations near zero under typical loads. Data delivery to consumers uses Go's io.CopyN function to transfer data directly from disk to network socket, bypassing unnecessary CPU and memory overhead. All messages are persisted in a write-ahead log divided into segments, with index files mapping offsets to physical disk locations for fast lookups. The full source code for HermitMQ is publicly available on GitHub, and the developer plans future optimizations including zero-serialization and branchless logic to fully eliminate garbage collection from the message processing path.