Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Recall that Belady’s anomaly is that th...
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Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:
S1: Random page replacement algorithm (where a page chosen at random is replaced)
Suffers from Belady’s anomaly
S2: LRU page replacement algorithm suffers from Belady’s anomaly
Suffers from Belady’s anomaly
S2: LRU page replacement algorithm suffers from Belady’s anomaly
Which of the following is CORRECT?
- a)S1 is true, S2 is true
- b)S1 is true, S2 is false
- c)S1 is false, S2 is true
- d)S1 is false, S2 is false
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Recall that Belady’s anomaly is that the page-fault rate may inc...
Was a computer scientist who proposed the Belady's anomaly in page replacement algorithms. This anomaly states that in certain cases, increasing the number of page frames in a memory can actually increase the number of page faults.
Belady's anomaly challenges the common intuition that increasing the number of page frames should always lead to a decrease in page faults. It occurs in page replacement algorithms that use the Least Recently Used (LRU) policy.
The LRU policy replaces the page that has not been used for the longest time. In Belady's anomaly, increasing the number of page frames can cause pages that were previously in memory to be evicted more frequently, resulting in more page faults.
This anomaly occurs when the reference pattern of a program has a high degree of locality and exhibits a "thrashing" behavior. Thrashing refers to a situation where the system spends a significant amount of time swapping pages in and out of memory, resulting in poor performance.
Belady's anomaly is important because it highlights the limitations of certain page replacement algorithms. It reminds us that increasing the number of page frames is not always the most effective solution to reducing page faults. Instead, it emphasizes the need for more sophisticated page replacement algorithms that can better handle the locality and thrashing behavior of programs.
Belady's anomaly challenges the common intuition that increasing the number of page frames should always lead to a decrease in page faults. It occurs in page replacement algorithms that use the Least Recently Used (LRU) policy.
The LRU policy replaces the page that has not been used for the longest time. In Belady's anomaly, increasing the number of page frames can cause pages that were previously in memory to be evicted more frequently, resulting in more page faults.
This anomaly occurs when the reference pattern of a program has a high degree of locality and exhibits a "thrashing" behavior. Thrashing refers to a situation where the system spends a significant amount of time swapping pages in and out of memory, resulting in poor performance.
Belady's anomaly is important because it highlights the limitations of certain page replacement algorithms. It reminds us that increasing the number of page frames is not always the most effective solution to reducing page faults. Instead, it emphasizes the need for more sophisticated page replacement algorithms that can better handle the locality and thrashing behavior of programs.
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Recall that Belady’s anomaly is that the page-fault rate may inc...
S1: Random page replacement algorithm (where a page chosen at random is replaced)
Suffers from Belady’s anomaly.
Random page replacement algorithm can behave like any replacement algorithm. It may behave as FIFO, LRU, MRU etc.). When random page replacement algorithm behaves like a FIFO page replacement algorithm in that case there can be chances of belady’s anamoly.
For this let us consider an example of FIFO case, if we consider the reference string 3 2 1 0 3 2 4 3 2 1 0 4 and 3 frame slots, in this we get 9 page fault but if we increase slots to 4, then we get 10 page faults.
So, page faults are increasing by increasing the number of frame slots. It suffers from belady’s anamoly.
Suffers from Belady’s anomaly.
Random page replacement algorithm can behave like any replacement algorithm. It may behave as FIFO, LRU, MRU etc.). When random page replacement algorithm behaves like a FIFO page replacement algorithm in that case there can be chances of belady’s anamoly.
For this let us consider an example of FIFO case, if we consider the reference string 3 2 1 0 3 2 4 3 2 1 0 4 and 3 frame slots, in this we get 9 page fault but if we increase slots to 4, then we get 10 page faults.
So, page faults are increasing by increasing the number of frame slots. It suffers from belady’s anamoly.
S2: LRU page replacement algorithm suffers from Belady’s anomaly
It doesn’t suffers from page replacement algorithm because in LRU, the page which is least recently used is replaced by the new page. Also, LRU Is a stack algorithm. (A stack algorithm is one that satisfies the inclusion property.) and stack algorithm doesn’t suffer from belady’s anamoly.
It doesn’t suffers from page replacement algorithm because in LRU, the page which is least recently used is replaced by the new page. Also, LRU Is a stack algorithm. (A stack algorithm is one that satisfies the inclusion property.) and stack algorithm doesn’t suffer from belady’s anamoly.
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Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect answer is option 'B'. Can you explain this answer?
Question Description
Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect 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 Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect 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 Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect answer is option 'B'. Can you explain this answer?.
Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect 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 Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect 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 Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect answer is option 'B'. Can you explain this answer?.
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ample number of questions to practice Recall that Belady’s anomaly is that the page-fault rate may increase as the number of allocated frames increases. Now, consider the following statements:S1: Random page replacement algorithm (where a page chosen at random is replaced)Suffers from Belady’s anomalyS2: LRU page replacement algorithm suffers from Belady’s anomalyWhich of the following is CORRECT?a)S1 is true, S2 is trueb)S1 is true, S2 is falsec)S1 is false, S2 is trued)S1 is false, S2 is falseCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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