IT Services Circle
Jun 4, 2026 · Fundamentals
Why CPUs Fight Even Without Shared Variables: Understanding False Sharing
The article explains that in multithreaded programs, even when threads operate on independent data, the CPU may still suffer severe performance loss due to false sharing of cache lines, and shows how cache‑line alignment and C++17 hardware‑aware constants can eliminate the problem.
C++cache linefalse sharing
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