Given below are two statements: one is labelled as Assertion A and the other…
2023
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. A virtual memory system uses first-in first-out page replacement policy and allocates a fixed number of frames to a process
Assertion A: Increasing number of page frames allocated to a process sometimes increases the page fault rate
Reason R: Some programs do not exhibit locality of reference
- A.
Both A and R are true and R is the correct explanation of A
- B.
Both A and R are true but R is not the correct explanation of A
- C.
A is true but R is false
- D.
A is false but R is true
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Correct answer: B
Assertion A is true because FIFO page replacement exhibits Belady's Anomaly, where increasing allocated frames can paradoxically increase the page fault rate.
Reason R is also a true statement regarding memory access patterns, but it does not cause Belady's Anomaly.
The anomaly arises from FIFO eviction mechanics, not the lack of locality itself.
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