Cache-Conscious Data Layout in Rust: Field Zoning, False Sharing, and the 128-Byte Rule
Summary
The article explains how to arrange data in Rust to minimize false sharing in multi-threaded scenarios, using field zoning and 128-byte alignment. It covers the rationale, defines hot and cold zones, and details a CacheAligned wrapper and a repr(C) layout to ensure the CPU sees the intended memory layout. Practical guidance includes when to apply 128-byte padding, how this affects a ring buffer design, and generalization to other shared data structures.