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A system uses FIFO policy for page replacement. It has 4 page frames with no pages loaded to begin with. The system first accesses 50 distinct pages in some order and then accesses the same 50 pages in reverse order. How many page faults will occur?
  • a)
    96
  • b)
    100
  • c)
    97
  • d)
    92
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A system uses FIFO policy for page replacement. It has 4 page frames w...
Page frames = 4
Pages: 1, 2, 3, 4 .... 45, 46, 47, 48, 49, 50, 50(H), 49(H), 48(H), 47(H), 46, 45, .....4, 3, 2, 1
First 50-page accesses will cause page fault but in reverse order page number 50, 49, 48, and 47 will not cause a page fault.
Hence total page faults are 50 + 46.
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Most Upvoted Answer
A system uses FIFO policy for page replacement. It has 4 page frames w...
Page frames = 4
Pages: 1, 2, 3, 4 .... 45, 46, 47, 48, 49, 50, 50(H), 49(H), 48(H), 47(H), 46, 45, .....4, 3, 2, 1
First 50-page accesses will cause page fault but in reverse order page number 50, 49, 48, and 47 will not cause a page fault.
Hence total page faults are 50 + 46.
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