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There are five virtual pages, numbered from 0 to 4. The page are referenced in the following order
0 1 2 3 0 1 4 0 1 2 3 4
If FIFO page replacement algorithm is used then find:
1. Number of page replacement faults that occur if 3 page frames are present.
2. Number of page faults that occur if 4 page frames are present.
0 1 2 3 0 1 4 0 1 2 3 4
If FIFO page replacement algorithm is used then find:
1. Number of page replacement faults that occur if 3 page frames are present.
2. Number of page faults that occur if 4 page frames are present.
- a)10,9
- b)9,10
- c)9, 8
- d)10,11
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
There are five virtual pages, numbered from 0 to 4. The page are refer...
If 3 page frames are used
Page hit : 0, 1, 4.
∴ Number of page fault = 9
If 4 pages frames are used
Page faults ; 0, 1, 2, 3, 4, 0, 1,2, 3, 4 Page hit : 0, 1
∴ Number of page faults = 10
Page hit : 0, 1, 4.
∴ Number of page fault = 9
If 4 pages frames are used
Page faults ; 0, 1, 2, 3, 4, 0, 1,2, 3, 4 Page hit : 0, 1
∴ Number of page faults = 10
Most Upvoted Answer
There are five virtual pages, numbered from 0 to 4. The page are refer...
Explanation:
First-In-First-Out (FIFO) algorithm: It is a page replacement algorithm that replaces the oldest page in the main memory with a new page when a page fault occurs.
Given: 5 virtual pages numbered from 0 to 4 referenced in the following order:
0 1 2 3 0 1 4 0 1 2 3 4
1. Number of page replacement faults that occur if 3 page frames are present:
Step 1: Initially all the page frames are empty and the page fault occurs for every reference.
0 1 2 3 0 1 4 0 1 2 3 4
F F F
Step 2: For the first 3 references, the page faults occur and the pages are loaded into the page frames.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2
Step 3: For the next 3 references, the pages are already present in the page frames and no page fault occurs.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2
Step 4: For the next reference, page 4 is not present in any of the page frames and a page fault occurs. As per FIFO algorithm, the oldest page in the memory is replaced with page 4.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2 F
Step 5: For the next 3 references, the pages are already present in the page frames and no page fault occurs.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2 F
Therefore, the total number of page faults = 9.
2. Number of page faults that occur if 4 page frames are present:
Step 1: Initially all the page frames are empty and the page fault occurs for every reference.
0 1 2 3 0 1 4 0 1 2 3 4
F F F F
Step 2: For the first 4 references, the page faults occur and the pages are loaded into the page frames.
0 1 2 3 0 1 4 0 1 2 3 4
F F F F 0 1 2 3
Step 3: For the next 2 references, the pages are already present in the page frames and no page fault occurs.
0 1 2 3 0 1 4 0 1 2 3 4
F F F F 0 1 2
First-In-First-Out (FIFO) algorithm: It is a page replacement algorithm that replaces the oldest page in the main memory with a new page when a page fault occurs.
Given: 5 virtual pages numbered from 0 to 4 referenced in the following order:
0 1 2 3 0 1 4 0 1 2 3 4
1. Number of page replacement faults that occur if 3 page frames are present:
Step 1: Initially all the page frames are empty and the page fault occurs for every reference.
0 1 2 3 0 1 4 0 1 2 3 4
F F F
Step 2: For the first 3 references, the page faults occur and the pages are loaded into the page frames.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2
Step 3: For the next 3 references, the pages are already present in the page frames and no page fault occurs.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2
Step 4: For the next reference, page 4 is not present in any of the page frames and a page fault occurs. As per FIFO algorithm, the oldest page in the memory is replaced with page 4.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2 F
Step 5: For the next 3 references, the pages are already present in the page frames and no page fault occurs.
0 1 2 3 0 1 4 0 1 2 3 4
F F F 0 1 2 F
Therefore, the total number of page faults = 9.
2. Number of page faults that occur if 4 page frames are present:
Step 1: Initially all the page frames are empty and the page fault occurs for every reference.
0 1 2 3 0 1 4 0 1 2 3 4
F F F F
Step 2: For the first 4 references, the page faults occur and the pages are loaded into the page frames.
0 1 2 3 0 1 4 0 1 2 3 4
F F F F 0 1 2 3
Step 3: For the next 2 references, the pages are already present in the page frames and no page fault occurs.
0 1 2 3 0 1 4 0 1 2 3 4
F F F F 0 1 2
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There are five virtual pages, numbered from 0 to 4. The page are referenced in the following order0 1 2 3 0 1 4 0 1 2 3 4If FIFO page replacement algorithm is used then find:1. Number of page replacement faults that occur if 3 page frames are present.2. Number of page faults that occur if 4 page frames are present.a)10,9b)9,10c)9, 8d)10,11Correct answer is option 'B'. Can you explain this answer?
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There are five virtual pages, numbered from 0 to 4. The page are referenced in the following order0 1 2 3 0 1 4 0 1 2 3 4If FIFO page replacement algorithm is used then find:1. Number of page replacement faults that occur if 3 page frames are present.2. Number of page faults that occur if 4 page frames are present.a)10,9b)9,10c)9, 8d)10,11Correct answer is option 'B'. 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 There are five virtual pages, numbered from 0 to 4. The page are referenced in the following order0 1 2 3 0 1 4 0 1 2 3 4If FIFO page replacement algorithm is used then find:1. Number of page replacement faults that occur if 3 page frames are present.2. Number of page faults that occur if 4 page frames are present.a)10,9b)9,10c)9, 8d)10,11Correct answer is option 'B'. 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 There are five virtual pages, numbered from 0 to 4. The page are referenced in the following order0 1 2 3 0 1 4 0 1 2 3 4If FIFO page replacement algorithm is used then find:1. Number of page replacement faults that occur if 3 page frames are present.2. Number of page faults that occur if 4 page frames are present.a)10,9b)9,10c)9, 8d)10,11Correct answer is option 'B'. Can you explain this answer?.
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