从SimPy2转换为SimPy3

Question

我试图模拟客户去银行。我想打印队列的平均长度，每个值对请求开始的时间和对[time of request or release, length of queue]

我知道simpy3中没有monitor类，所以我尝试使用下面的示例here，我留下了转换文件中的相关代码以及我尝试转换它的代码。 simpy2和python2

from SimPy.Simulation import *
import random as rnd

interarrival_time = 10.0
service_time = 8.0


class CustomerGenerator( Process ):
    def produce( self, b ):
        while True:
            c = Customer( b )
            c.start( c.doit() )
            yield hold, self, rnd.expovariate(1.0/interarrival_time)


class Customer( Process ):
    def __init__( self, resource ):
        Process.__init__( self )
        self.bank = resource

    def doit( self ):
        yield request, self, self.bank
        yield hold, self, self.bank.servicetime()
        yield release, self, self.bank

class Bank( Resource ):
    def servicetime( self ):
        return rnd.expovariate(1.0/service_time)


initialize()

bank = Bank( capacity=1, monitored=True, monitorType=Monitor )

src = CustomerGenerator()
activate( src, src.produce( bank ) )

simulate( until=100)


print bank.waitMon.mean()
print

for evt in bank.waitMon:
    print evt[0], evt[1]

simpy3和python3

from simpy import *
import random as rnd

interarrival_time = 10.0
service_time = 8.0


def produce( env, b ):
    while True:
        customer(env,b)
        yield env.timeout(rnd.expovariate(1.0/interarrival_time))

def customer(env,bank):
    yield bank.request()
    yield env.timeout(bank.servicetime())
    bank.release()

class MonitoredResource(Resource):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.data = []
        self.num_requests = 0
    def mean(self):
        try:
            mean = 0
            for el in self.data:
                mean += el[1]
            mean /= self.num_requests
            return mean
        except ZeroDivisionError:
            pass
    def request(self, *args, **kwargs):
        self.data.append((self._env.now, len(self.queue)))
        self.num_requests += 1 
        return super().request(*args, **kwargs)

    def release(self, *args, **kwargs):
        self.data.append((self._env.now, len(self.queue)))
        return super().release(*args, **kwargs)

class Bank(MonitoredResource):
    def servicetime( self ):
        return rnd.expovariate(1.0/service_time)


env = Environment()
bank = Bank(env,capacity=1)

src = env.process(produce(env,bank))

env.run( until=100)


print(bank.mean())
print()

for evt in bank.data:
    print(evt[0], evt[1])

如何让SimPy3模拟器的输出类似于SimPy2模拟器，而不是只打印一个？你知道吗

Answer 1

似乎我只需要告诉release（）哪个request（）正在被释放，以获得所需的输出。并将客户作为一个流程来运行。你知道吗

from simpy import *
import random as rnd

interarrival_time = 10.0
service_time = 8.0


def produce( env, bank ):
    print("generating")
    while True:
        env.process(customer(env,bank))
        t = rnd.expovariate(1.0/interarrival_time)
        yield env.timeout(t)

def customer(env,bank):
    req = bank.request()
    yield req
    yield env.timeout(bank.servicetime())
    bank.release(req)

class MonitoredResource(Resource):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.data = []
        self.num_requests = 0

    def mean(self):
        if(self.num_requests > 0):
            mean = 0
            for el in self.data:
                mean += el[1]
            mean /= self.num_requests
            return mean

    def request(self, *args, **kwargs):
        self.data.append((self._env.now, len(self.queue)))
        self.num_requests += 1 
        return super().request(*args, **kwargs)

    def release(self, *args, **kwargs):
        self.data.append((self._env.now, len(self.queue)))
        return super().release(*args, **kwargs)

class Bank(MonitoredResource):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
    def servicetime( self ):
        return rnd.expovariate(1.0/service_time)


env = Environment()
bank = Bank(env,capacity=1)
#bank = Bank( capacity=1, monitored=True, monitorType=Monitor )

src = env.process(produce(env,bank))

env.run(until=100)


print(bank.mean())
print()

for evt in bank.data:
    print(evt[0], evt[1])