Calculate i) Waiting time ii) Turnaround time for Shortest Job First (SJF) and Earliest Deadline First (EDF). Comment on the result. All tasks entered ready queue at same time.

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written 5.7 years ago by

hetalgosavi • 1.6k

Graphical representation based on SJF (Shortest Job First).

Total execution time = 6 + 16 + 18 = 40 sec

Total execution time is less than farthest deadline. Therefore tasks are schedulable.

Waiting time is calculated as follows -

T1 = 0 sec

T2 = 6 sec

T3 = 6 + 16 = 22 sec

Turnaround time (total time for completion) is calculated as follows -

T1 = 6 sec

T2 = 6+16 = 22 sec

T3 = 6+16+18 = 40 sec

Graphical representation based on EDF (Earliest Deadline First).

Total execution time = 6 + 16 + 18 = 40 sec

Total execution time is less than farthest deadline. Therefore tasks are schedulable.

Waiting time is calculated as follows -

T1 =(Execution time of T2)= 16 sec

T2 = 0 sec

T3 = (Execution time of T2 + T1) = 6 + 16 = 22 sec

Turnaround time (total time for completion) is calculated as follows -

T1 = 6 + 16 = 22 sec

T2 = 16 sec

T3 = 6+16+18 = 40 sec

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