ITPEC FE Morning April 2021 Question 18
ITPEC FE Morning April 2021 — Question 18 of 80
LRU Page Replacement — identify the Least Recently Used method in virtual memory.
LRU (Least Recently Used) replaces the page that has not been referenced for the longest time.
Why not others:
- (a) — describes NRU (Not Recently Used) / Clock algorithm, which uses reference and change flags
- (b) — describes Random replacement, where any page is chosen with equal probability
- (c) — describes FIFO (First-In, First-Out), which replaces the page that has been in memory the longest (regardless of usage)
Key rule: LRU tracks last access time, not load time. FIFO tracks load time, not access time.
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