Created
November 13, 2022 03:40
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class Process: | |
def __init__(self, pid, at, bt, priority=None): | |
self.pid = pid | |
self.at = at | |
self.bt = bt | |
self.priority = priority | |
self.ct = None | |
self.tat = None | |
self.wt = None | |
self.bt_remaining = bt | |
self.completed = 0 | |
self.start_time = None | |
self.rt = None | |
def runScheduler(processes: "list[Process]", tq=1): | |
print("Inside scheduler") | |
n = len(processes) | |
completed = 0 | |
current_time = 0 | |
processes.sort(key=lambda x: x.at) | |
while completed != n: | |
for i in range(n): | |
if processes[i].at <= current_time: | |
if processes[i].bt_remaining > 0: | |
if processes[i].bt_remaining > tq: | |
current_time = current_time + tq | |
processes[i].bt_remaining = processes[i].bt_remaining - tq | |
else: | |
current_time = current_time + processes[i].bt_remaining | |
processes[i].bt_remaining = 0 | |
completed = completed + 1 | |
processes[i].ct = current_time | |
else: | |
current_time = current_time + tq | |
def findTurnAroundTime(processes): | |
total_tat = 0 | |
for i in range(len(processes)): | |
# tat = ct[i] - at[i] | |
tat = processes[i].ct - processes[i].at | |
total_tat = total_tat + tat | |
processes[i].tat = tat | |
return total_tat | |
def findWaitingTime(processes): | |
total_wait = 0 | |
for i in range(len(processes)): | |
# wt[i] = tat[i] - bt[i] | |
wt = processes[i].tat - processes[i].bt | |
processes[i].wt = wt | |
total_wait = total_wait + wt | |
return total_wait | |
def findAvgTime(processes, tq): | |
n = len(processes) | |
# # run scheduling algorithm: priority scheduling | |
runScheduler(processes, tq) | |
processes.sort(key=lambda x: x.ct) | |
# Function to find turn around time for all processes | |
total_tat = findTurnAroundTime(processes) | |
# Function to find wait time for all processes | |
total_wt = findWaitingTime(processes) | |
# Display processes along with all details | |
print("PID\tAT\tBT" + "\tCT" + "\tTAT\tWT") | |
for i in range(n): | |
print(str(processes[i].pid) + "\t" + str(processes[i].at) + "\t" + str(processes[i].bt) + "\t" + str( | |
processes[i].ct) + "\t" + str(processes[i].tat) + "\t" + str(processes[i].wt) + "\t" | |
# str(processes[i].priority) + "\t" | |
) | |
print("Average waiting time = " + str(total_wt / n)) | |
print("Average turn around time = " + str(total_tat / n)) | |
if __name__ == "__main__": | |
# process_list = [Process(1, 2, 6), Process(2, 5, 2), Process(3, 1, 8), Process(4, 0, 3), Process(5, 4, 4)] | |
# process_list = [Process(1, 1, 3,3), Process(2, 2, 5,4), Process(3, 3, 1,1), Process(4, 4, 7,7), Process(5, 5, 4,8)] | |
process_list = [Process(pid=1, at=2, bt=6), Process(pid=2, at=115, bt=2), Process(pid=3, at=1, bt=8), | |
Process(pid=4, at=0, bt=3), Process(pid=5, at=4, bt=4)] | |
findAvgTime(process_list, 2) | |
tq = 2 |
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