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In which one of the following page replacement algorithms it is possible for the page fault rate to increase even when the number of allocated frames increases? 
1. LRU (Least Recently Used)
2. OPT (Optimal Page Replacement)
3. MRU (Most Recently Used)
4. FIFO (First In First Out)

1 Answer

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Best answer
Correct Answer - Option 4 : FIFO (First In First Out)

Concept:

Belady’s anomaly is the phenomenon in which increasing the number of page frame results in  increase in the number of page faults.

Explanation:

FIFO replacement algorithm results in page faults by increasing the number of page frames.

Consider the example:

Frame = 3

String = 0 1 5 3 0 1 4 0 1 5 3 4

REQUEST

0

1

5

3

0

1

4

0

1

5

3

4

Frame 3

 

 

5

5

5

1

1

1

1

1

3

3

Frame 2

 

1

1

1

0

0

0

0

0

5

5

5

Frame 1

0

0

0

3

3

3

4

4

4

4

4

4

Miss/Hit

Miss

Miss

Miss

Miss

Miss

Miss

Miss

Hit

Hit

Miss

Miss

Hit

 

Number of page faults = 9

Take number of frames = 4

REQUEST

0

1

5

3

0

1

4

0

1

5

3

4

Frame 4

 

 

 

3

3

3

3

3

3

5

5

5

Frame 3

 

 

5

5

5

5

5

5

1

1

1

1

Frame 2

 

1

1

1

1

1

1

0

0

0

0

4

Frame 1

0

0

0

0

0

0

0

4

4

4

3

3

Miss/Hit

Miss

Miss

Miss

Miss

Hit

Hit

Miss

Miss

Miss

Miss

Miss

Miss


Number of page faults = 10

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