Consider the following set of processes that need to be scheduled on a single CPU. All the times aregiven in milliseconds.Using the shortest remaining time first scheduling algorithm, the average process turnaround time(in msec) is ____________________.Correct answer is '7.2'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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Consider the following set of processes that need to be scheduled on a single CPU. All the times are
given in milliseconds.

Using the shortest remaining time first scheduling algorithm, the average process turnaround time
(in msec) is ____________________.

Correct answer is '7.2'. Can you explain this answer?

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Consider the following set of processes that need to be scheduled on a...

Turn around time of a process is total time between submission of the process and its completion. Shortest remaining time (SRT) scheduling algorithm selects the process for execution which has the smallest amount of time remaining until completion.

Solution:

Let the processes be A, ,C,D and E. These processes will be executed in following order. Gantt chart is as follows:

First 3 sec, A will run, then remaining time A=3, B=2,C=4,D=6,E=3 Now B will get chance to run for 2 sec, then remaining time. A=3, B=0,C=4,D=6,E=3

Now A will get chance to run for 3 sec, then remaining time. A=0, B=0,C=4,D=6,E=3 By doing this way, you will get above gantt chart.

Scheduling table:

As we know, turn around time is total time between submission of the process and its completion. i.e turn around time=completion time-arrival time. i.e. TAT=CT-AT

Turn around time of A = 8 (8-0)

Turn around time of B = 2 (5-3)

Turn around time of C = 7 (12-5)

Turn around time of D = 14 (21-7)

Turn around time of E = 5 (15-10)

Average turn around time is (8+2+7+14+5)/5 = 7.2.

Answer is 7.2.

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Consider the following set of processes that need to be scheduled on a single CPU. All the times aregiven in milliseconds.Using the shortest remaining time first scheduling algorithm, the average process turnaround time(in msec) is ____________________.Correct answer is '7.2'. Can you explain this answer?

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