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Which of the following Page Replacement Algorithm suffers from the Belady’s anomaly ?

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NIELIT Scientific Assistant CS 5 Dec 2021 Official Paper
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  1. LRU 
  2. Optimal page Replacement
  3. FIFO 
  4. Both LRU and FIFO

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Option 3 : FIFO 
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<h2><span>The correct answer is <u><strong>FIFO</strong></u>.</span></h2><p><span> <strong><span><u>Key Points</u></span></strong> </span></p><ul> <li><strong>FIFO (First-In-First-Out)</strong> is a page replacement algorithm that suffers from Belady's anomaly.</li> <li>Belady's anomaly refers to the counterintuitive situation where increasing the number of page frames results in an increase in the number of page faults.</li> <li>In the FIFO algorithm, pages are replaced in the order they arrive, which can lead to suboptimal page replacement decisions.</li> <li>Belady's anomaly is not observed in other algorithms like LRU (Least Recently Used) and Optimal Page Replacement.</li> </ul><p><span> <strong><span><u>Additional Information</u></span></strong> </span></p><ul> <li><strong>LRU (Least Recently Used)</strong> algorithm replaces the page that has not been used for the longest period of time. It does not suffer from Belady's anomaly.</li> <li><strong>Optimal Page Replacement</strong> algorithm replaces the page that will not be used for the longest period of time in the future. It also does not suffer from Belady's anomaly.</li> <li>Belady's anomaly occurs because the FIFO algorithm does not take into account the frequency or recency of page accesses.</li> <li>Understanding and addressing Belady's anomaly is important for designing efficient memory management systems.</li> </ul> - www.bijoux-oeil-de-tigre.com
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-> NIELIT Scientific Assistant city intimation slip 2025 has been released at the official website.

-> NIELIT Scientific Assistant exam 2025 is scheduled to be conducted on June 28. 

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More Page Replacement Policy Questions

Q1.Given as 4 GB (= 4.3 × 109 bytes) of virtual space and typical page size of 4 KB and each page table entry is 5 bytes. How many virtual pages would this imply ? What is the size of whole page table ? 
Q2.Consider the following statements: S1: LRU page replacement algorithm suffers from the belady's anomaly S2: Shortest remaining time first scheduling may cause starvations S3: Stack is shared by all threads in a process 
Q3.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. A virtual memory system uses first-in first-out page replacement policy and allocates a fixed number of frames to a process Assertion A: Increasing number of page frames allocated to a process sometimes increases the page fault rate. Reason R: Some programs do not exhibit locality of reference. In the light of the above statements, choose the correct answer from the options given below. 
Q4.Consider the following reference string of pages made by a processor : 4, 7, 5, 7, 6, 7, 10, 4, 8, 5, 8, 6, 8, 11, 4, 9, 5, 9, 6, 9, 12, 4, 7, 5, 7 Assume that the number of page frames allocated in the main memory is four. What is the number of page faults generated using Least Recently Used (LRU) replacement technique?
Q5.For the following page reference string 4, 3, 2, 1, 4, 3, 5, 4, 3, 2, 1, 5. the number of page faults that occur in Least Recently Used (LRU) page replacement algorithm with frame size 3 is
Q6.When a page fault occurs before an executing instruction is complete :
Q7.The aim of creating page replacement algorithms is to :
Q8.A FIFO replacement algorithm associates with each page the ______.
Q9.A process refers to 5 pages, A, B, C, D, E in the order: A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page transfers with an empty internal store of 3 frames is 7. If the number of page frames is increased to 4, then the number of page transfers :

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Q1.Given as 4 GB (= 4.3 × 109 bytes) of virtual space and typical page size of 4 KB and each page table entry is 5 bytes. How many virtual pages would this imply ? What is the size of whole page table ? 
Q2.Consider the following statements: S1: LRU page replacement algorithm suffers from the belady's anomaly S2: Shortest remaining time first scheduling may cause starvations S3: Stack is shared by all threads in a process 
Q3.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. A virtual memory system uses first-in first-out page replacement policy and allocates a fixed number of frames to a process Assertion A: Increasing number of page frames allocated to a process sometimes increases the page fault rate. Reason R: Some programs do not exhibit locality of reference. In the light of the above statements, choose the correct answer from the options given below. 
Q4.Consider the following reference string of pages made by a processor : 4, 7, 5, 7, 6, 7, 10, 4, 8, 5, 8, 6, 8, 11, 4, 9, 5, 9, 6, 9, 12, 4, 7, 5, 7 Assume that the number of page frames allocated in the main memory is four. What is the number of page faults generated using Least Recently Used (LRU) replacement technique?
Q5.For the following page reference string 4, 3, 2, 1, 4, 3, 5, 4, 3, 2, 1, 5. the number of page faults that occur in Least Recently Used (LRU) page replacement algorithm with frame size 3 is
Q6.When a page fault occurs before an executing instruction is complete :
Q7.The aim of creating page replacement algorithms is to :
Q8.A FIFO replacement algorithm associates with each page the ______.
Q9.A process refers to 5 pages, A, B, C, D, E in the order: A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page transfers with an empty internal store of 3 frames is 7. If the number of page frames is increased to 4, then the number of page transfers :
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