Deepin Linux

Oct 21, 2026 · Fundamentals

CPU Cache Deep Dive: Why Cache Misses Kill Performance and How to Write Cache-Friendly Code

This article explains CPU cache hierarchy, cache line structure, mapping policies, write strategies, and MESI coherence protocol with C++ benchmarks showing 8x speedups from row-major traversal, struct alignment, and false sharing elimination using alignas(64) and hardware_destructive_interference_size.