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Level 23 · ◆◆◆ · ~12 min

Concurrency and One Cache Line

Concurrency and One Cache Line

"Two threads, two different variables, one 64-byte line — and a program that gets slower the more cores you give it."

data racesfalse sharingatomics and lock-free queuesthe GIL and what actually parallelises
🚀 You're jumping ahead. This builds on The Semantics That Bite — but play it now and you'll still earn full XP. If it feels steep, those make a gentler on-ramp.

A short lesson, then a quiz. ❤️×3 — a wrong answer costs a heart; finish with at least one left and the level is yours. Lose all three and you'll have to try again. Replay any time — XP and cleared levels are never lost.