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Assume that the three processes arrived in order: Processes                            CPU Burst Time P1  &n

Assume that the three processes arrived in order:

Processes                            CPU Burst Time

P1                                           17

P2                                            6

P3                                            8

a.     Please draw the Gantt chart if FCFS scheduling is used.

b.    Please calculate the average waiting time and average completion time under FCFS. You MUST show the calculation procedure.

c.      Please draw the Gantt chart if Round Robin is used.

d.    Please calculate the average waiting time and completion time under RR with q = 3. You MUST show the calculation procedure.

e.      Between the two CPU scheduling strategies, which one is better? Why?

Assume that the three processes arrived in order at time 0:

Processes                            CPU Burst Time

P1                                           10

P2                                            5

P3                                            7

P4                                            3

a.     If Shortest-Job-First is used, please draw the Gantt chart.

b.    Please calculate the average waiting time and average completion time under SJF.

Assume that the three processes arrived at different time:

Processes             Arrival Time               CPU Burst Time

P1                              0                                     16

P2                              2                                      8

P3                              3                                      7

P4                              4                                      4

a.     If the Shortest-Remaining-Time-First scheduling is used, please draw the Gantt chart.

b.    Please calculate the average waiting time and the average turnaround time

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Answer #1

Ans 2 3 3 1 31 143 3 1 G@age 0H7 +QL 3 13-33 = 3 Average cr 3 s 9 tAvg WT 15 vera RR s better Hom fCPS.@ sJe 「5 = 6, 5 16 35 85 19

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