Ausführen einer Simpy-Simulation bis zu einem gegebenen Wert

Question

Ich bin neu in SymPy (3.0.8) und möchte eine Demo-Simulation 'Konferenzteilnehmer' bis zu einem geben Wert (250), dh bis 7 (3 Gespräche , 1 Pause, 3 Gespräche, 1 Pause, 1 Gespräch).

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

Aber die Simulation endet nach 3 Gesprächen, 1 Pause, 3 Gespräche und 1 Pause (210).

Ich würde gerne wissen, warum die Simulationen nicht laufen bis "7 sprechen" und wie man das beheben kann.

# 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) 

Der Ausgang dieser Simulation ist:

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 

Aber ich erwartet, dass es sein:

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

Bitte setzen Sie ATTENDEES = 1 und ändern Sie den inneren for Schleife:

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}') 

Wenn Sie Ihre Simulation erneut ausführen lassen und darüber nachdenken, was passiert, sollten Sie verstehen, dass die Ausgabe, die Sie erhalten, korrekt ist. :)