Question

In: Computer Science

Five processes A, B, C, D, E arrive at the same time in this order ($A$...

Five processes A, B, C, D, E arrive at the same time in this order ($A$ first, $E$ last).
They have estimated services times of 12u, 8u, 10u, 6u, 4u, where u is some unit of time.

(a) Show the scheduling order under
First-Come-First-Served (FCFS), Shortest Process Next (SPN),
Shortest Remaining Time (SRT) next, Round-Robin with quantum of 2u (RR2).

Note: Write BCADE to indicate the order of execution if you believe that B executes first, then C, then A, etc.

The problem continues with the following two questions.

(b) (2pt) What is the turnaround time for processes A and E under RR?


(c)   (3pt) What is the wait time spent on the ready queue for processes B, C, and D?

Solutions

Expert Solution

a)

Using FCFS

Using Shortest Process Next

Using Shortest Remaing time next

Using RR

b) Turn Around time(TAT) process A = 40u and B =20u

c) Waiting Time(WT) process B = 24u , C = 28u and D = 22u

Note* TAT = Completion Time - Arrival Time

WT = TAT - Service Time(ST)

venereology answered 2 weeks ago
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