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A virtual memory system uses First In First Out (FIFO) page replacement policy and allocates a fixed number of frames to a process. Consider the following statements:
P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate.
Q: Some programs do not exhibit locality of reference.
Q: Some programs do not exhibit locality of reference.
Q. Which one of the following is TRUE?
- a)Both P and Q are true, and Q is the reason for P
- b)Both P and Q are true, but Q is not the reason for P.
- c)P is false, but Q is true
- d)Both P and Q are false
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
A virtual memory system uses First In First Out (FIFO) page replacemen...
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. Solution:
Statement P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate. Correct, as FIFO page replacement algorithm suffers from belady’s anomaly which states above statement.
Statement Q: Some programs do not exhibit locality of reference. Correct, Locality often occurs because code contains loops that tend to reference arrays or other data structures by indices. So we can write a program does not contain loop and do not exhibit locality of reference. So, both statement P and Q are correct but Q is not the reason for P as Belady’s Anomaly occurs for some specific patterns of page references.
Statement P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate. Correct, as FIFO page replacement algorithm suffers from belady’s anomaly which states above statement.
Statement Q: Some programs do not exhibit locality of reference. Correct, Locality often occurs because code contains loops that tend to reference arrays or other data structures by indices. So we can write a program does not contain loop and do not exhibit locality of reference. So, both statement P and Q are correct but Q is not the reason for P as Belady’s Anomaly occurs for some specific patterns of page references.
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A virtual memory system uses First In First Out (FIFO) page replacemen...
Explanation:
The given statements are:
P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate.
Q: Some programs do not exhibit locality of reference.
Statement P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate.
In a virtual memory system with a fixed number of page frames allocated to a process, the page replacement policy determines which pages are evicted from memory when a page fault occurs. The First In First Out (FIFO) page replacement policy evicts the oldest page in memory.
If the number of page frames allocated to a process is increased, more pages can be kept in memory at the same time. This increases the likelihood that a page requested by the process will already be in memory, reducing the page fault rate. However, increasing the number of page frames also means that the paging space available for other processes is reduced, potentially increasing the page fault rate for those processes.
Therefore, increasing the number of page frames allocated to a process can sometimes lead to an increase in the page fault rate, and the statement P is true.
Statement Q: Some programs do not exhibit locality of reference.
Locality of reference refers to the phenomenon where a program tends to access a relatively small portion of its address space at any given time. This can be temporal locality, where recently accessed pages are likely to be accessed again in the near future, or spatial locality, where pages that are close to each other in memory are likely to be accessed together.
While most programs exhibit some form of locality of reference, there are certain types of programs that do not. For example, scientific simulations or programs that perform random memory accesses may not exhibit a strong locality of reference.
Therefore, the statement Q is true.
Conclusion:
Both statements P and Q are true, but Q is not the reason for P. Therefore, the correct answer is option 'B'.
The given statements are:
P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate.
Q: Some programs do not exhibit locality of reference.
Statement P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate.
In a virtual memory system with a fixed number of page frames allocated to a process, the page replacement policy determines which pages are evicted from memory when a page fault occurs. The First In First Out (FIFO) page replacement policy evicts the oldest page in memory.
If the number of page frames allocated to a process is increased, more pages can be kept in memory at the same time. This increases the likelihood that a page requested by the process will already be in memory, reducing the page fault rate. However, increasing the number of page frames also means that the paging space available for other processes is reduced, potentially increasing the page fault rate for those processes.
Therefore, increasing the number of page frames allocated to a process can sometimes lead to an increase in the page fault rate, and the statement P is true.
Statement Q: Some programs do not exhibit locality of reference.
Locality of reference refers to the phenomenon where a program tends to access a relatively small portion of its address space at any given time. This can be temporal locality, where recently accessed pages are likely to be accessed again in the near future, or spatial locality, where pages that are close to each other in memory are likely to be accessed together.
While most programs exhibit some form of locality of reference, there are certain types of programs that do not. For example, scientific simulations or programs that perform random memory accesses may not exhibit a strong locality of reference.
Therefore, the statement Q is true.
Conclusion:
Both statements P and Q are true, but Q is not the reason for P. Therefore, the correct answer is option 'B'.
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A virtual memory system uses First In First Out (FIFO) page replacement policy and allocates a fixed number of frames to a process. Consider the following statements:P: Increasing the number of page frames allocated to a process sometimes increases the page fault rate.Q: Some programs do not exhibit locality of reference.Q. Which one of the following is TRUE?a)Both P and Q are true, and Q is the reason for Pb)Both P and Q are true, but Q is not the reason for P.c)P is false, but Q is trued)Both P and Q are falseCorrect answer is option 'B'. Can you explain this answer?
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