Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Consider a demand paging system with four-pag...
Start Learning for Free
Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string
7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1
the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.
Correct answer is '0.6'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
Consider a demand paging system with four-page frames (initially empty...
Page Fault Rate Calculation for a Demand Paging System with LRU Page Replacement Policy
To calculate the page fault rate for the given page reference string, we need to keep track of the number of page faults and the number of memory accesses. The page fault rate is then calculated by dividing the number of page faults by the number of memory accesses.
Given:
Page reference string: 7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1
Number of page frames: 4 (initially empty)
Page replacement policy: LRU (Least Recently Used)
1. Initialize the page frames:
The page frames are initially empty, so we have:
[_, _, _, _]
2. Process the page reference string:
For each page in the reference string, we check if it is already present in one of the page frames. If it is not present, we have a page fault and need to replace a page using the LRU policy.
- Access page 7: Page fault, as the page frame is empty.
Page frames: [7, _, _, _]
- Access page 2: Page fault, as the page frame is empty.
Page frames: [7, 2, _, _]
- Access page 7: Page fault, as page 7 is already in one of the frames but not the most recently used.
Page frames: [7, 2, _, _]
- Access page 3: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, _]
- Access page 2: Page fault, as page 2 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, _]
- Access page 5: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 5]
- Access page 3: Page fault, as page 3 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 5]
- Access page 4: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 4]
- Access page 6: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 6]
- Access page 7: Page fault, as page 7 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 6]
- Access page 7: Page fault, as page 7 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 6]
- Access page 1: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 1]
- Access page 5: Page fault, as page 5 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 1]
- Access page 6: Page fault, as page
To calculate the page fault rate for the given page reference string, we need to keep track of the number of page faults and the number of memory accesses. The page fault rate is then calculated by dividing the number of page faults by the number of memory accesses.
Given:
Page reference string: 7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1
Number of page frames: 4 (initially empty)
Page replacement policy: LRU (Least Recently Used)
1. Initialize the page frames:
The page frames are initially empty, so we have:
[_, _, _, _]
2. Process the page reference string:
For each page in the reference string, we check if it is already present in one of the page frames. If it is not present, we have a page fault and need to replace a page using the LRU policy.
- Access page 7: Page fault, as the page frame is empty.
Page frames: [7, _, _, _]
- Access page 2: Page fault, as the page frame is empty.
Page frames: [7, 2, _, _]
- Access page 7: Page fault, as page 7 is already in one of the frames but not the most recently used.
Page frames: [7, 2, _, _]
- Access page 3: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, _]
- Access page 2: Page fault, as page 2 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, _]
- Access page 5: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 5]
- Access page 3: Page fault, as page 3 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 5]
- Access page 4: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 4]
- Access page 6: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 6]
- Access page 7: Page fault, as page 7 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 6]
- Access page 7: Page fault, as page 7 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 6]
- Access page 1: Page fault, as the page frame is empty.
Page frames: [7, 2, 3, 1]
- Access page 5: Page fault, as page 5 is already in one of the frames but not the most recently used.
Page frames: [7, 2, 3, 1]
- Access page 6: Page fault, as page
Free Test
FREE
| Start Free Test |
Community Answer
Consider a demand paging system with four-page frames (initially empty...
There are four-page frames are given and an LRU page replacement policy is used.
The given page size= 4,
The given page reference string is = 7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1
Number of Page faults = 9
Number of Page hits = 6
Number of memory access = 15
Page fault rate = Number of page faults / Number of memory access
Page fault rate = 9/15
Page fault rate = 0.6
Hence the correct answer is 0.6.
Number of Page hits = 6
Number of memory access = 15
Page fault rate = Number of page faults / Number of memory access
Page fault rate = 9/15
Page fault rate = 0.6
Hence the correct answer is 0.6.
Attention Computer Science Engineering (CSE) Students!
To make sure you are not studying endlessly, EduRev has designed Computer Science Engineering (CSE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Computer Science Engineering (CSE).
|
Explore Courses for Computer Science Engineering (CSE) exam
|
|
Similar Computer Science Engineering (CSE) Doubts
Top Courses for Computer Science Engineering (CSE)View all
Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer?
Question Description
Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer?.
Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer?.
Solutions for Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
Download more important topics, notes, lectures and mock test series for Computer Science Engineering (CSE) Exam by signing up for free.
Here you can find the meaning of Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer?, a detailed solution for Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? has been provided alongside types of Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider a demand paging system with four-page frames (initially empty) and LRU page replacement policy. For the following page reference string7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 7, 1, 5, 6, 1the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is ______.Correct answer is '0.6'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
|
|
Explore Courses for Computer Science Engineering (CSE) exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup