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Determine the number of page faults when references to pages occur in the order -1, 2,4, 5, 2,1,2, 4. Assume that the main memory can accommodate 3 pages and the main memory already has the pages 1 and 2, with page 1 having been brought earlier than page 2. (Assume LRU algorithm is used)
  • a)
    3
  • b)
    5
  • c)
    4
  • d)
    None of the above
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Determine the number of page faults when references to pages occur in ...
1, 2, 4, 5, 2, 1 , 2 , 4
Since 1 and 2 are already in the memory which can accomodate 3 pages
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Most Upvoted Answer
Determine the number of page faults when references to pages occur in ...
Explanation:

Page Faults Calculation:
- Initially, main memory has pages 1 and 2.
- When page 1 is accessed, there is no page fault.
- When page 2 is accessed, there is no page fault.
- When page 4 is accessed, page 4 is brought into memory replacing page 1 (LRU).
- When page 5 is accessed, page 5 is brought into memory replacing page 2 (LRU).
- When page 2 is accessed again, there is no page fault.
- When page 1 is accessed again, page 1 is brought into memory replacing page 4 (LRU).
- When page 2 is accessed again, there is no page fault.
- When page 4 is accessed again, there is no page fault.

Total Page Faults:
- Total page faults = 4
Therefore, the correct answer is option C) 4.
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Determine the number of page faults when references to pages occur in the order -1, 2,4, 5, 2,1,2, 4. Assume that the main memory can accommodate 3 pages and the main memory already has the pages 1 and 2, with page 1 having been brought earlier than page 2. (Assume LRU algorithm is used)a)3b)5c)4d)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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