IT Services Circle
Jun 10, 2022 · Fundamentals
Page Replacement Algorithms: OPT, FIFO, LRU, CLOCK, and LFU
This article reviews virtual memory concepts and explains five page replacement algorithms—Optimal (OPT), First‑In‑First‑Out (FIFO), Least Recently Used (LRU), CLOCK (including a simple and improved version), and Least Frequently Used (LFU)—detailing their principles, operation, advantages, drawbacks, and illustrative examples.
FIFOLRUOPT
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