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Round Robin Scheduling

Three processes each with CPU burst time of 5 units arrive in a system in which RR scheduling is followed. If time quantum is changed from 1 unit to 5 units then what will be the effect on the resulting turnaround time?

(A) Decreases by 72%
(B) Increases by 28%
(C) Decreases by 28%
(D) Increases by 72%

Answer

q = 1 unit, turnaround time = (13 + 14 + 15) / 3 = 14 units
q = 5 units, turnaround time = (5 + 10 + 15) / 3 = 10 units
TA time decreases by (14 - 10) × 100 / 14 ≈ 28.5 %
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