HW2 Solution

HW2 Solution - 1 Use exponential averaging to predict the...

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1. Use exponential averaging to predict the size of the next CPU burst. Use α =0.75. (a) (10 points) At time 5, the predicted CPU burst was 8 but the actual CPU burst was 4. What is the prediction for time 6? T n+1 = α t n + (1- α )T n T 6 =(0.75)4 + (1-0.75)8 = 3+2 = 5 (b) (10 points) At time 6, the actual CPU burst was 12. What is the prediction for time 7? T 7 =(0.75)12 + (1-0.75)5 = 9+1.25=10.25 2. (a) (10 points) What is the average waiting time and the average turnaround time of the following Gantt chart where processes P 1 and P 2 arrive at time 0, processes P 3 and P 4 arrive at time 6, and process P 5 arrives at time 8. Average waiting time: (0+5+9+6+0)/5 = 4 Average turnaround time: (5+8+15+9+4)/5 = 8.2 (b) (10 points) What is the average waiting time and the average turnaround time of the following Gantt chart where the processes P 1 and P 2 arrive at time 0, process P 3 arrives at time 3, process P 4 arrives at time 12, and process P 5 arrives at time 16. Average waiting time:
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HW2 Solution - 1 Use exponential averaging to predict the...

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