Calculate the hit and miss using various page replacement policies LRU, OPT, FIFO for following sequence (page frame size 3) 4,7,3,0,1,7,3,8,5,4,5,3,4,7,534 state which one is best for above example?

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written 3.1 years ago by

teamques10 ★ 69k

Given String Sequence - 4,7,3,0,1,7,3,8,5,4,5,3,4,7,5,3,4

Frame Size - 3

FIFO Page Replacement Algorithm

String	4	7	3	0	1	7	3	8	5	4	5	3	4	7	5	3	4
Frame 3			3	3	3	7	7	7	5	5	5	5	5	7	7	7	7
Frame 2		7	7	7	1	1	1	8	8	8	8	3	3	3	3	3	4
Frame 1	4	4	4	0	0	0	3	3	3	4	4	4	4	4	5	5	5
Miss/Hit	M	M	M	M	M	M	M	M	M	M	H	M	H	M	M	H	M

Number of Page Faults in FIFO = 14

String	4	7	3	0	1	7	3	8	5	4	5	3	4	7	5	3	4
Frame 3			3	3	3	7	7	7	5	5	5	5	5	7	7	7	4
Frame 2		7	7	7	1	1	1	8	8	8	8	3	3	3	5	5	5
Frame 1	4	4	4	0	0	0	3	3	3	4	4	4	4	4	4	3	3
Miss/Hit	M	M	M	M	M	M	M	M	M	M	H	M	H	M	M	M	M

Number of Page Faults in LRU = 15

String	4	7	3	0	1	7	3	8	5	4	5	3	4	7	5	3	4
Frame 3			3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
Frame 2		7	7	7	7	7	7	7	7	4	4	4	4	7	7	7	4
Frame 1	4	4	4	0	1	1	1	8	5	5	5	5	5	5	5	5	5
Miss/Hit	M	M	M	M	M	H	H	M	M	M	H	H	H	M	H	H	M

Number of Page Faults in Optimal Page Replacement Algorithm = 10

Because of a Low Number of Page Faults, Optimal Page Replacement Algorithm works better for the above example.

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