Operating System Unit 4 Notes AKTU (BCS401)

AKTU · BTECH · Semester 4 · Operating System · Unit 4 · Notes

AKTU Operating System (BCS401) Unit 4 notes for B.Tech Semester 4 – Memory Management. Topics: Basic Memory Management, Paging and Segmentation, Virtual…

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Unit 4: Memory Management – AKTU syllabus topics

  • Basic Memory Management: Fixed Partition Multiprogramming, Variable Partition Multiprogramming, Protection Schemes
  • Paging and Segmentation: Paging, Segmentation, Paged Segmentation
  • Virtual Memory: Demand Paging, Page Replacement Algorithms, Thrashing
  • Cache Memory: Cache Memory Organization, Locality of Reference

Most asked AKTU PYQ questions from Unit 4

  1. Q2d. In optimal page replacement algorithm, information about all future page references is available to the OS. A modification: OS correctly predicts only up to next 4 page references. A process accesses pages: 1, 3, 2, 4, 2, 3, 1, 2, 4, 3, 1, 4. If the system has three memory frames that are… (7 marks, 2024-25)
  2. Q1g. What is the purpose of a page replacement algorithm? (2 marks, 2024-25)
  3. Q5a. Explain the concept of demand paging. Consider the given references to the following pages by a program: 0,9,0,1,8,1,8,7,8,7,1,2,8,2,7,8,2,3,8,3. How many pages faults will occur if the program has three-page frames available to it and uses: (i) FIFO replacement (ii) LRU replacement (iii) Optimal… (10 marks, 2022-23)
  4. Q2d. Compare and contrast multiprogramming with fixed partitions and variable partitions? (7 marks, 2023-24)
  5. Q6a. Explain the principles of paging and segmentation as memory management techniques, comparing their suitability for different system architectures? (7 marks, 2023-24)
  6. Q1f. Explain internal and external fragmentation. (2 marks, 2022-23)
  7. Q1h. Distinguish between physical and logical address space of a process. (2 marks, 2022-23)
  8. Q7b. Illustrate the following page-replacement algorithms. i) FIFO ii) Optimal Page Replacement. Use the reference string 7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1, 7, 0, 1 for a memory with three frames. (10 marks, 2021-22)
  9. Q6a. Discuss multiprogramming with variable partitions and how it improves memory utilization. (7 marks, 2024-25)
  10. Q1g. Explain thrashing and locality of reference. (2 marks, 2022-23)

AKTU paper codes: BCS401, KCS401, RCS401

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