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A virtual memory system uses FIFO page replacement policy and allocates a fixed number of frames to the process. Consider the following statements
M : Increasing the number of page frames allocated to a process sometimes increases the page fault rate
N : Some programs do not exhibit locality of reference Which one of the following is true?
- a)Both M and N are true and N is the reason for M
- b)Both M and N are true and N is not the reason for M
- c)Both M and N are false
- d)M is false, but N is true
Correct answer is option 'B'. Can you explain this answer?
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A virtual memory system uses FIFO page replacement policy and allocate...
Statement M: Increasing the number of page frames allocated to a process sometimes increases the page fault rate
Increasing the number of page frames allocated to a process refers to increasing the amount of physical memory available to the process for storing its pages. The page fault rate is the rate at which the process needs to access pages that are not currently in physical memory and thus, require a page fault to occur.
Explanation:
When a process accesses a page that is not present in physical memory, a page fault occurs. This page fault triggers the operating system to bring the required page from the disk into a free page frame in physical memory. If all the page frames are already occupied, the operating system needs to select a victim page frame to replace with the required page.
Explanation of FIFO page replacement policy:
In FIFO page replacement policy, the operating system selects the oldest page in physical memory as the victim for replacement. This means that the page that has been in memory for the longest time is replaced. The page frames are managed in a queue-like structure, and the page at the front of the queue is the one that will be replaced when a page fault occurs.
Explanation of the relationship between the number of page frames and page fault rate:
When the number of page frames allocated to a process is increased, it means that more pages can be stored in physical memory. This results in a lower probability of page faults because a larger portion of the process's pages can be kept in memory at any given time.
However, there is a point of diminishing returns. If the number of page frames allocated to a process exceeds a certain threshold, increasing the number of page frames may not significantly reduce the page fault rate. This is because the process may not have enough locality of reference to fully utilize the additional page frames. Locality of reference refers to the tendency of a process to access pages that are near each other in memory.
Statement N: Some programs do not exhibit locality of reference
Some programs do not exhibit locality of reference, which means they do not have a tendency to access pages that are near each other in memory. These programs have a more random access pattern and may require more page faults even with a large number of page frames allocated to them.
Explanation of the relationship between locality of reference and page fault rate:
Programs that exhibit strong locality of reference tend to have a lower page fault rate because they access pages that are already in physical memory. However, programs that do not exhibit locality of reference may have a higher page fault rate because they frequently access pages that are not in physical memory, regardless of the number of page frames allocated to them.
Conclusion:
From the explanations above, we can conclude that both statements M and N are true, and statement N is the reason for statement M. Increasing the number of page frames allocated to a process generally reduces the page fault rate, but there are cases where the page fault rate may not decrease significantly if the process does not exhibit locality of reference. Therefore, option B is the correct answer.
Increasing the number of page frames allocated to a process refers to increasing the amount of physical memory available to the process for storing its pages. The page fault rate is the rate at which the process needs to access pages that are not currently in physical memory and thus, require a page fault to occur.
Explanation:
When a process accesses a page that is not present in physical memory, a page fault occurs. This page fault triggers the operating system to bring the required page from the disk into a free page frame in physical memory. If all the page frames are already occupied, the operating system needs to select a victim page frame to replace with the required page.
Explanation of FIFO page replacement policy:
In FIFO page replacement policy, the operating system selects the oldest page in physical memory as the victim for replacement. This means that the page that has been in memory for the longest time is replaced. The page frames are managed in a queue-like structure, and the page at the front of the queue is the one that will be replaced when a page fault occurs.
Explanation of the relationship between the number of page frames and page fault rate:
When the number of page frames allocated to a process is increased, it means that more pages can be stored in physical memory. This results in a lower probability of page faults because a larger portion of the process's pages can be kept in memory at any given time.
However, there is a point of diminishing returns. If the number of page frames allocated to a process exceeds a certain threshold, increasing the number of page frames may not significantly reduce the page fault rate. This is because the process may not have enough locality of reference to fully utilize the additional page frames. Locality of reference refers to the tendency of a process to access pages that are near each other in memory.
Statement N: Some programs do not exhibit locality of reference
Some programs do not exhibit locality of reference, which means they do not have a tendency to access pages that are near each other in memory. These programs have a more random access pattern and may require more page faults even with a large number of page frames allocated to them.
Explanation of the relationship between locality of reference and page fault rate:
Programs that exhibit strong locality of reference tend to have a lower page fault rate because they access pages that are already in physical memory. However, programs that do not exhibit locality of reference may have a higher page fault rate because they frequently access pages that are not in physical memory, regardless of the number of page frames allocated to them.
Conclusion:
From the explanations above, we can conclude that both statements M and N are true, and statement N is the reason for statement M. Increasing the number of page frames allocated to a process generally reduces the page fault rate, but there are cases where the page fault rate may not decrease significantly if the process does not exhibit locality of reference. Therefore, option B is the correct answer.
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Community Answer
A virtual memory system uses FIFO page replacement policy and allocate...
First In First Out Page Replacement Algorithms: This is the simplest page replacement algorithm. In this algorithm, operating system keeps track of all pages in the memory in a queue, oldest page is in the front of the queue. When a page needs to be replaced page in the front of the queue is selected for removal.
FIFO Page replacement algorithms suffers from Belady’s anomaly :
Belady’s anomaly states that it is possible to have more page faults when increasing the number of page frames.
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A virtual memory system uses FIFO page replacement policy and allocates a fixed number of frames to the process. Consider the following statementsM : Increasing the number of page frames allocated to a process sometimes increases the page fault rateN : Some programs do not exhibit locality of reference Which one of the following is true?a)Both M and N are true and N is the reason for Mb)Both M and N are true and N is not the reason for Mc)Both M and N are falsed)M is false, but N is trueCorrect answer is option 'B'. Can you explain this answer?
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A virtual memory system uses FIFO page replacement policy and allocates a fixed number of frames to the process. Consider the following statementsM : Increasing the number of page frames allocated to a process sometimes increases the page fault rateN : Some programs do not exhibit locality of reference Which one of the following is true?a)Both M and N are true and N is the reason for Mb)Both M and N are true and N is not the reason for Mc)Both M and N are falsed)M is false, but N is trueCorrect 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 A virtual memory system uses FIFO page replacement policy and allocates a fixed number of frames to the process. Consider the following statementsM : Increasing the number of page frames allocated to a process sometimes increases the page fault rateN : Some programs do not exhibit locality of reference Which one of the following is true?a)Both M and N are true and N is the reason for Mb)Both M and N are true and N is not the reason for Mc)Both M and N are falsed)M is false, but N is trueCorrect 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 A virtual memory system uses FIFO page replacement policy and allocates a fixed number of frames to the process. Consider the following statementsM : Increasing the number of page frames allocated to a process sometimes increases the page fault rateN : Some programs do not exhibit locality of reference Which one of the following is true?a)Both M and N are true and N is the reason for Mb)Both M and N are true and N is not the reason for Mc)Both M and N are falsed)M is false, but N is trueCorrect answer is option 'B'. Can you explain this answer?.
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