GATE | GATE-CS-2009 | Question 8

In which one of the following page replacement policies, Belady’s anomaly may occur?

(B) Optimal

Answer: (A)

Explanation: Belady’s anomaly proves that it is possible to have more page faults when increasing the number of page frames while using the First in First Out (FIFO) page replacement algorithm.

See the wiki page for an example of increasing page faults with number of page frames.

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