GATE | GATE-CS-2004 | Question 90

Consider the following set of processes, with the arrival times and the CPU-burst times given in milliseconds

  Process   Arrival Time    Burst Time
    P1          0              5
    P2          1              3
    P3          2              3
    P4          4              1

What is the average turnaround time for these processes with the preemptive shortest remaining processing time first (SRPT) algorithm ?
(A) 5.50
(B) 5.75
(C) 6.00
(D) 6.25


Answer: (A)

Explanation: The following is Gantt Chart of execution

P1 P2 P4 P3 P1
1 4 5 8 12

 



Turn Around Time = Completion Time – Arrival Time

 

Avg Turn Around Time  =  (12 + 3 + 6+  1)/4 = 5.50

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