Given the following code snippet implementing a Round Robin CPU scheduling algorithm, what will be the output when the processes are scheduled?
def round_robin(processes, burst_time, quantum):
n = len(processes)
waiting_time = [0] * n
remaining_time = burst_time[:]
t = 0
while True:
done = True
for i in range(n):
if remaining_time[i] > 0:
done = False
if remaining_time[i] > quantum:
t += quantum
remaining_time[i] -= quantum
else:
t += remaining_time[i]
waiting_time[i] = t - burst_time[i]
remaining_time[i] = 0
if done:
break
return waiting_time
processes = [1, 2, 3]
burst_time = [10, 5, 8]
quantum = 2
waiting_time = round_robin(processes, burst_time, quantum)
print(waiting_time)
The Round Robin scheduling algorithm allocates a fixed time quantum to each process. In the given example, three processes have burst times of 10, 5, and 8, respectively. With a time quantum of 2, each process is executed in turn until all are completed. The waiting times for each process are calculated as follows: • Process 1: Waiting time = Total time elapsed - Burst time = 20 - 10 = 12 • Process 2: Waiting time = 5 - 5 = 3 • Process 3: Waiting time = Total time elapsed - Burst time = 20 - 8 = 6 Thus, the output is [12, 3, 6]. Why Other Options Are Wrong: B) [14, 5, 8]: This option is incorrect as it does not accurately reflect the waiting times computed in the Round Robin scheduling. C) [10, 2, 4]: This option is incorrect because it implies significantly lower waiting times than calculated. D) [9, 1, 2]: This option is incorrect as it underestimates the waiting times based on the execution order. E) [0, 0, 0]: This option is incorrect as it assumes no waiting time at all, which is not the case.
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