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Comparison of Process Scheduling Algorithms in Operating Systems

This homework assignment discusses the different process scheduling algorithms and their impact on response time, wait time, and turnaround time in operating systems.

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Comparison of Process Scheduling Algorithms in Operating Systems

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  1. Homework 2 Sarah Diesburg Operating Systems COP 4610

  2. Why does OS loader set kernel mode? • OS needs to run with full privileges • Sets more restrictive user mode bit for user programs • Protects OS from errant user programs

  3. Time 700 800 0 100 200 300 400 500 600 Three Processes Process A Process B Process C

  4. Time 700 800 0 100 200 300 400 500 600 First In, First Out Process A Process B Process C FIFO C A B

  5. Time 700 800 0 100 200 300 400 500 600 First In, First Out Process A Process B Process C FIFO Average response time = [(300-50) + (500-150) + 0]/3 = 200 C A B

  6. Time 700 800 0 100 200 300 400 500 600 First In, First Out Process A Process B Process C FIFO Average wait time = [(300-50) + (500-150) + 0]/3 = 200 C A B

  7. Time 700 800 0 100 200 300 400 500 600 First In, First Out Process A Process B Process C FIFO Average turnaround time = [(500-50) + (900-150) + (300-0)]/3 = 500 C A A B B

  8. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C

  9. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C

  10. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A

  11. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A

  12. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C

  13. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C

  14. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B

  15. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B

  16. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B A

  17. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B A

  18. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B A C

  19. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B A C

  20. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B A C B

  21. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR C A C B A C B

  22. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR Average response time = [(100-50) + (300 – 150) + 0]/3 = 66.7 C A C B A C B

  23. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR Average wait time = {[(100–50) + (400–200)] + [(300–150) + (600–400)] + [0 + (200–100) + (500–300)]}/3 = [250 + 350 + 300]/3 = 300 C A C B A C B

  24. Time 700 800 0 100 200 300 400 500 600 Round Robin (Time slice = 100) Process A Process B Process C RR Average turnaround time = [(500 – 50) + (900 – 150) + (600 – 0)]/3 = 600 C A C B A C B

  25. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN C

  26. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN C

  27. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN C A

  28. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN C A

  29. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN C A

  30. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN C A B

  31. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN C A B

  32. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN Average response time = [(300-50) + (500-150) + 0]/3 = 200 C A B

  33. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN Average wait time = [(300-50) + (500-150) + 0]/3 = 200 C A B

  34. Time 700 800 0 100 200 300 400 500 600 Shortest Job Next Process A Process B Process C SJN Average turnaround time = [(500-50) + (900-150) + (300-0)]/3 = 500 C A B

  35. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C

  36. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C

  37. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C A

  38. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C A

  39. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C A C

  40. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C A C

  41. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C A C B

  42. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF C A C B

  43. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF Average response time = [0 + (500-150) + 0]/3 = 117 C A C B

  44. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF Average wait time = [0 + (500 – 150) + (250 – 50)]/3 = 183 C A C B

  45. Time 700 800 0 100 200 300 400 500 600 Shortest Remaining Time First Process A Process B Process C SRTF Average turnaround time = [(250 – 50) + (900 – 150) + (500 – 0)]/3 = 483 C A C B

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