IT Learning Made Simple

Aug 31, 2026 · Fundamentals

Page Replacement Algorithms: Who Gets Kicked Out When Memory Is Full?

When a device runs out of RAM, page replacement algorithms decide which pages to evict; the article defines page replacement, outlines goals, compares OPT, FIFO, LRU and their approximations, explains the Belady anomaly, and shows real‑world uses in Linux, JVM GC, and Redis.