Determine the turnaround time, waiting time and response time of Job B

Question

Given the jobs with the following characteristics:

Determine the turnaround time, waiting time and response time of Job B while the CPU runs these jobs. Assume the schedule is pre-emptive and the CPU quantum is 5 ms

1.   (55,35,5)
2.   (70,30,10)
3.   (35,25,0)
4.   None

Comments

where is the diagram?

Answer 1

Gann Chat for the above process schedule is given below .

Assuming All process arrived at 0ms

Turn Around Time = Completion Time - Arrival Time

                              =60- 0  = 60ms

Waiting Time = TAT - (IO+BT )
                        = 60-(35)
                         = 25 ms

Comments

even though I/O of A will be completed at time t=30,yet we perform C after B because C follows B in ready queue..right??

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yes. FCFS is followed in Ready Queue  no matter what algorithm is used to schedule the process