A system has three page frames and uses LRU page replacement. For the reference string 1, 2, 3, 1, 4, 2, how many page faults occur?
Options
- A. 4
- B. 5
- C. 6
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. 5
Detailed Explanation
Explanation: The references 1, 2 and 3 initially cause three faults. Reference 1 is a hit. When 4 is referenced, LRU replaces page 2 because it is the least recently used. Reference 2 then causes another fault and replaces the least recently used page. Therefore, total page faults = 5.