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GATE | GATE-CS-2016 (Set 2) | Question 57

  • Last Updated : 22 Jul, 2021

Consider the following processes, with the arrival time and the length of the CPU burst given in milliseconds. The scheduling algorithm used is preemptive shortest remaining-time first.

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The average turn around time of these processes is ___________ milliseconds.
 
Note : This question was asked as Numerical Answer Type.
(A) 8.25
(B) 10.25
(C) 6.35
(D) 4.25


Answer: (A)

Explanation: PreEmptive Shortest Remaining time first scheduling, i.e. that processes will be scheduled on the CPU which will be having least remaining burst time( required time at the CPU).

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The processes are scheduled and executed as given in the below Gantt chart.
 



 

Turn Around Time(TAT) = Completion Time(CT) – Arrival Time(AT)

TAT for P1 = 20 – 0 = 20

TAT for P2 = 10 – 3 = 7

TAT for P3 = 8- 7 = 1

TAT for P4 = 13 – 8 = 5

Hence, Average TAT = Total TAT of all the processes / no of processes = ( 20 + 7 + 1 + 5 ) / 4 = 33 / 4 = 8.25
 
Thus, option (A) is the correct choice.

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