運行一個Simpy模擬直到給定的值

Question

我是SymPy（3.0.8）的新手，想要運行演示模擬'會議參加者'直到給定值（250），即跑到講話7（3講話，1次休息，3次會談，1次休息，1次談話）。

3 * 30 + 15 + 3×30 + 15 + 1 * 30 = 240

但模擬後3次會談，1個斷裂，3輪會談和1箇中斷（210）結束。

我想知道爲什麼模擬不會運行，直到'談話7'，以及如何解決這個問題。

# import 
import simpy 
from random import randint 

# config 
TALKS_PER_SESSION = 3 
TALK_LENGTH = 30 
BREAK_LENGTH = 15 
ATTENDEES = 3 

# process function 
def attendee(env, name, knowledge=0, hunger=0): 
    talks = 0 
    breaks = 0 
    while True: 
     # Visit talks 
     for i in range(TALKS_PER_SESSION): 
      knowledge += randint(0, 3)/(1 + hunger) 
      hunger += randint(1, 4) 
      talks += 1 
      yield env.timeout(TALK_LENGTH) 

     print('Attendee %s finished %d talks with knowledge %.2f and hunger %.2f.' % (name, talks, knowledge, hunger)) 

     # Go to buffet 
     food = randint(3, 12) 
     hunger -= min(food, hunger) 
     breaks += 1 

     yield env.timeout(BREAK_LENGTH) 

     print('Attendee %s has finished break %d with hunger %.2f' % (name, breaks, hunger)) 

# setup environment and run simulation 
env = simpy.Environment() 
for i in range(ATTENDEES): 
    env.process(attendee(env, i)) 
env.run(until=250) 

這種模擬的輸出是：

Attendee 0 finished 3 talks with knowledge 2.33 and hunger 7.00. 
Attendee 1 finished 3 talks with knowledge 0.60 and hunger 8.00. 
Attendee 2 finished 3 talks with knowledge 3.81 and hunger 7.00. 
Attendee 0 has finished break 1 with hunger 0.00 
Attendee 1 has finished break 1 with hunger 0.00 
Attendee 2 has finished break 1 with hunger 0.00 
Attendee 0 finished 6 talks with knowledge 5.53 and hunger 6.00. 
Attendee 1 finished 6 talks with knowledge 1.89 and hunger 9.00. 
Attendee 2 finished 6 talks with knowledge 4.31 and hunger 5.00. 
Attendee 0 has finished break 2 with hunger 0.00 
Attendee 1 has finished break 2 with hunger 0.00 
Attendee 2 has finished break 2 with hunger 0.00 

但我希望它是：

Attendee 0 finished 3 talks with knowledge 2.33 and hunger 7.00. 
Attendee 1 finished 3 talks with knowledge 0.60 and hunger 8.00. 
Attendee 2 finished 3 talks with knowledge 3.81 and hunger 7.00. 
Attendee 0 has finished break 1 with hunger 0.00 
Attendee 1 has finished break 1 with hunger 0.00 
Attendee 2 has finished break 1 with hunger 0.00 
Attendee 0 finished 6 talks with knowledge 5.53 and hunger 6.00. 
Attendee 1 finished 6 talks with knowledge 1.89 and hunger 9.00. 
Attendee 2 finished 6 talks with knowledge 4.31 and hunger 5.00. 
Attendee 0 has finished break 2 with hunger 0.00 
Attendee 1 has finished break 2 with hunger 0.00 
Attendee 2 has finished break 2 with hunger 0.00 
Attendee 0 finished 7 talks with knowledge <...> and hunger <...>. 
Attendee 1 finished 7 talks with knowledge <...> and hunger <...>. 
Attendee 2 finished 7 talks with knowledge <...> and hunger <...>. 

Answer 1

請設置ATTENDEES = 1和改變內部for環路：

for i in range(TALKS_PER_SESSION): 
     print(f'Talk {talks+1} begins at {env.now}') 
     knowledge += randint(0, 3)/(1 + hunger) 
     hunger += randint(1, 4) 
     talks += 1 
     yield env.timeout(TALK_LENGTH) 
     print(f'Talk {talks} ends at {env.now}') 

當您讓您的模擬再次運行並考慮發生的情況時，您應該瞭解您獲得的輸出是正確的。 :)