from simpy.simulation import * ImportError: No module named simulation

[Vahid Nourbakhsh]

Hi,

I am trying to run this code I found, but it gives me the following error. Any idea what the problem is and how I can fix it?

Error:

from simpy.simulation import *

ImportError: No module named simulation

Code:

#!/usr/bin/env python

# simulates NMachines machines, plus a queue of jobs waiting to use them 4

# usage: python MMk.py NMachines ArvRate SrvRate MaxSimtime

from random import Random,expovariate

from simpy.simulation import *

# globals

class G:

    Rnd = Random(12345)

class MachineClass(Process):

    SrvRate = None # reciprocal of mean service time

    Busy = [] # busy machines

    Idle = [] # idle machines

    Queue = [] # queue for the machines

    NDone = 0 # number of jobs done so far

    TotWait = 0.0 # total wait time of all jobs done so far, including

    # both queuing and service times

    def __init__(self):

        Process.__init__(self)

        MachineClass.Idle.append(self) # starts idle

    def Run(self):

        while 1:

            # "sleep" until this machine awakened

            yield passivate,self

            MachineClass.Idle.remove(self)

            MachineClass.Busy.append(self)

            # take jobs from the queue as long as there are some there

            while MachineClass.Queue != []:

                # get the job

                J = MachineClass.Queue.pop(0)

                # do the work

                yield hold,self,G.Rnd.expovariate(MachineClass.SrvRate)

                # bookkeeping

                MachineClass.NDone += 1

                MachineClass.TotWait += now() - J.ArrivalTime

            MachineClass.Busy.remove(self)

            MachineClass.Idle.append(self)

class JobClass:

    def __init__(self):

        self.ArrivalTime = now()

class ArrivalClass(Process):

    ArvRate = None

    def __init__(self):

        Process.__init__(self)

    def Run(self):

        while 1:

            # wait for arrival of next job

            yield hold,self,G.Rnd.expovariate(ArrivalClass.ArvRate)

            J = JobClass()

            MachineClass.Queue.append(J)

            # any machine ready?

            if MachineClass.Idle != []:

                reactivate(MachineClass.Idle[0])

def main():

    NMachines = 1 #int(sys.argv[1])

    ArrivalClass.ArvRate =2 #float(sys.argv[2])

    MachineClass.SrvRate =10 #float(sys.argv[3])

#    initialize()

    for I in range(NMachines):

        M = MachineClass()

        activate(M,M.Run())

    A = ArrivalClass()

    activate(A,A.Run())

    MaxSimtime =60 #float(sys.argv[4])

    simulate(until=MaxSimtime)

    print MachineClass.TotWait/MachineClass.NDone

    

if  __name__ == "__main__": main()

[Stefan Scherfke]

Hi Vahid,

this is SimPy 2 code. It won’t run with SimPy 3.

Cheers,
Stefan

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