python中FCFS调度等待时间的计算算法
考虑下面的代码,它获取输入进程及其到达时间,并根据FCFS算法对它们进行排序,所以我一直在考虑计算平均等待时间的算法,但都是错误的,所以有什么建议吗 流程=输入(“输入流程时间和到达时间,以逗号分隔:”) 用于计算总时间的代码: 打印“按此顺序执行的进程:”,列表1python中FCFS调度等待时间的计算算法,python,algorithm,methods,Python,Algorithm,Methods,考虑下面的代码,它获取输入进程及其到达时间,并根据FCFS算法对它们进行排序,所以我一直在考虑计算平均等待时间的算法,但都是错误的,所以有什么建议吗 流程=输入(“输入流程时间和到达时间,以逗号分隔:”) 用于计算总时间的代码: 打印“按此顺序执行的进程:”,列表1 process_queue = [] total_wtime = 0 for i in range(len(list2)): process_queue[i].append(int(list1
process_queue = []
total_wtime = 0
for i in range(len(list2)):
process_queue[i].append(int(list1[i])
total_wtime += process_queue[i][1]
它在最后一行给出了错误
进程\队列[i]。追加(int(列表1[i])
您将list1的第i个元素添加到进程队列列表中,您应该注意list1[i]不是一个列表,而是一个整数。在下一行中,您将尝试访问它
总时间+=进程队列[i][1]
进程队列[i]的第一个元素,但它不是2d数组
总时间+=进程队列[i]
应该有效。概念:
# Author:Geraldo Braho
process_queue = []
total_wtime = 0
n = int(raw_input('Enter the total numbers of processes: '))
for i in xrange(n):
process_queue.append([])#append a list object to the list
process_queue[i].append(raw_input('Enter process name: '))
process_queue[i].append(int(raw_input('Enter process arrival Time : ')))
total_wtime += process_queue[i][1]
process_queue[i].append(int(raw_input('Enter Process CPU bustTime : ')))
print ''
process_queue.sort(key = lambda process_queue:process_queue[1])
print 'ProcessName\tArrivalTime\tBurstTime'
for i in xrange(n):
print process_queue[i][0],'\t\t',process_queue[i][1],'\t\t',process_queue[i][2]
print 'Total waiting time: ',total_wtime
print 'Average waiting time: ',(total_wtime/n)
“一切都是假的”-这意味着什么?你尝试过什么?它到底有什么问题?输出给出了错误的值什么值?你期望什么值?代码在哪里?waitingTime=startTime-arrivalTime-TurnationTime=burstTime+waitingTime=finishTime-arrivalTime请编辑问题以添加代码,格式正确,并请提供我要求的另外两条信息。
# Author:Geraldo Braho
process_queue = []
total_wtime = 0
n = int(raw_input('Enter the total numbers of processes: '))
for i in xrange(n):
process_queue.append([])#append a list object to the list
process_queue[i].append(raw_input('Enter process name: '))
process_queue[i].append(int(raw_input('Enter process arrival Time : ')))
total_wtime += process_queue[i][1]
process_queue[i].append(int(raw_input('Enter Process CPU bustTime : ')))
print ''
process_queue.sort(key = lambda process_queue:process_queue[1])
print 'ProcessName\tArrivalTime\tBurstTime'
for i in xrange(n):
print process_queue[i][0],'\t\t',process_queue[i][1],'\t\t',process_queue[i][2]
print 'Total waiting time: ',total_wtime
print 'Average waiting time: ',(total_wtime/n)
processes = [
{"pid": "P0", "burst_time": 5, "arrival_time": 0, "service_time": None, "waiting_time": None},
{"pid": "P1", "burst_time": 3, "arrival_time": 1, "service_time": None, "waiting_time": None},
{"pid": "P2", "burst_time": 8, "arrival_time": 2, "service_time": None, "waiting_time": None},
{"pid": "P3", "burst_time": 6, "arrival_time": 3, "service_time": None, "waiting_time": None}
]
# No waiting time for first process
processes[0]["waiting_time"] = 0
# Service_time of the first process is it's arrival time
processes[0]["service_time"] = processes[0]["arrival_time"]
for i in range(1, len(processes)):
# Case where process comes when processor is in idle state
if processes[i]["arrival_time"] > (processes[i - 1]["service_time"] + processes[i - 1]["burst_time"]):
processes[i]["service_time"] = processes[i]["arrival_time"]
else:
processes[i]["service_time"] = processes[i - 1]["service_time"] + processes[i - 1]["burst_time"]
processes[i]["waiting_time"] = processes[i]["service_time"] - processes[i]["arrival_time"]
total_waiting_time = 0
for process in processes:
total_waiting_time += process["waiting_time"]
avg_waiting_time = total_waiting_time / len(processes)
print("Average Waiting Time:", avg_waiting_time)