OperatingSystems
October 27, 2023Sorting
October 27, 2023OperatingSystems
Question 20

Recall that Belady’s anomaly is that the pagefault rate may increase as the number of allocated frames increases. Now, consider the following statements:
S1: Random page replacement algorithm (where a page chosen at random is replaced) suffers from Belady’s anomaly
S2: LRU page replacement algorithm suffers from Belady’s anomaly
Which of the following is CORRECT?
S1: Random page replacement algorithm (where a page chosen at random is replaced) suffers from Belady’s anomaly
S2: LRU page replacement algorithm suffers from Belady’s anomaly
Which of the following is CORRECT?
S1 is true, S2 is true


S1 is true, S2 is false


S1 is false, S2 is true


S1 is false, S2 is false

Question 20 Explanation:
FIFO may suffer from Belady’s anomaly not always FIFO suffer from Belady’s anomaly.
Page replacement algorithm suffers from Belady’s anomaly when it is not a stack algorithm.
S1: Random page replacement algorithm is not a stack algorithm. So, S1 is true.
S2: LRU is a stack algorithm. Therefore, it doesn’t suffer from Belady’s anomaly. S2 is false.
Page replacement algorithm suffers from Belady’s anomaly when it is not a stack algorithm.
S1: Random page replacement algorithm is not a stack algorithm. So, S1 is true.
S2: LRU is a stack algorithm. Therefore, it doesn’t suffer from Belady’s anomaly. S2 is false.
Correct Answer: B
Question 20 Explanation:
FIFO may suffer from Belady’s anomaly not always FIFO suffer from Belady’s anomaly.
Page replacement algorithm suffers from Belady’s anomaly when it is not a stack algorithm.
S1: Random page replacement algorithm is not a stack algorithm. So, S1 is true.
S2: LRU is a stack algorithm. Therefore, it doesn’t suffer from Belady’s anomaly. S2 is false.
Page replacement algorithm suffers from Belady’s anomaly when it is not a stack algorithm.
S1: Random page replacement algorithm is not a stack algorithm. So, S1 is true.
S2: LRU is a stack algorithm. Therefore, it doesn’t suffer from Belady’s anomaly. S2 is false.
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