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How many page faults occur in a system with LRU page replacement policy having 3 (initially empty) page frames for the following string of page reference - 5, 1, 2, 3, 4, 3, 2, 3, 1, 2, 4, 3?

How many page faults occur in a system with LRU page replacement policy having 3 (initially empty) page frames for the following string of page reference - 5, 1, 2, 3, 4, 3, 2, 3, 1, 2, 4, 3? Correct Answer 8

LRU page replacement algorithm:

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Hit miss table:

5

1

2

3

4

3

2

3

1

2

4

3

M

M

M

M

M

H

H

H

M

H

M

M

 

∴number of miss = page faults = 8 

Important Points:

M is miss which corresponds to a page fault

H is hit which corresponds to page hit (no page fault)

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