Question
Download Solution PDFConsider the following reference string of pages made by a processor :
4, 7, 5, 7, 6, 7, 10, 4, 8, 5, 8, 6, 8, 11, 4, 9, 5, 9, 6, 9, 12, 4, 7, 5, 7
Assume that the number of page frames allocated in the main memory is four. What is the number of page faults generated using Least Recently Used (LRU) replacement technique?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe sequence of page references and track the page frames using the LRU replacement technique:
Reference string: 4,7,5,7,6,7,10,4,8,5,8,6,8,11,4,9,5,9,6,9,12,4,7,5,7
* is denote the Page Hit.
| 4 | 4 | 4 | 4 | 10 | 10 | 10 | 10 | 6 | 6 | 6 | 9 | 9 | * | 9 | * | 9 | 9 | 9 | 5 | |||||
| 7 | 7 | * | 7 | * | 7 | 7 | 7 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 12 | 12 | 12 | 12 | ||||||
| 5 | 5 | 5 | 4 | 4 | 4 | 4 | 11 | 11 | 11 | 11 | 6 | 6 | 6 | 7 | 7 | * | ||||||||
| 6 | 6 | 6 | 8 | 8 | * | 8 | * | 8 | 8 | 8 | 5 | 5 | 5 | 4 | 4 | 4 |
There were 18 pages faults.
Here, option 3 is correct.
Last updated on May 28, 2025
-> UPSC ESE admit card 2025 for the prelims exam has been released.
-> The UPSC IES Prelims 2025 will be held on 8th June 2025.
-> The selection process includes a Prelims and a Mains Examination, followed by a Personality Test/Interview.
-> Candidates should attempt the UPSC IES mock tests to increase their efficiency. The UPSC IES previous year papers can be downloaded here.