Question

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Scheduling Algorithms Part 1 First Come First Serve Consider the following processes along with their burst...

Scheduling Algorithms

Part 1

First Come First Serve

Consider the following processes along with their burst time (in Calculate the average waiting time if the processes arrive in the following order

Process	Burst Time in Ms
P1	20
P2	10
P3	5

Calculate the average waiting time if the processes arrive in the following order

(i)P1, P2, P3

(ii)P2, P3, P1

(i) Case 1: Consider a case if processes P1, P2, P3 arrive at the same time say 0 ms in the system in the order P1, P2, P3. The arrival of processes is represented in the Gantt chart as shown below.

Gantt chart

P1

P2

P3

20 30 35

Process	Waiting Time	Turnaround Time
P1	0	20
P2	20	30
P3	30	35

Therefore, average waiting time =

Turnaround Time =

Case 2: Processes arrive in order P1, P2, P3, let us assume at 0 ms, 2 ms and 4 ms, respectively.

Arrival Time: Time at which the process arrives in the ready queue.

Process	Burst Time	Arrival Time
P1	20	0
P2	10	2
P3	5	4

Gantt chart: Draw the Gantt Chart

Waiting time for process P1 = 0 ms

Waiting time for process P2 = 20 ms – 2 ms = 18 ms

Waiting time for process P3 = 30 ms- 4 ms = 26 ms

Calculate the average waiting time

Calculate the Turnaround Time

Expert Solution

venereology answered 7 months ago

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