Question

When trying to run this code

for i in range(N):
    jobs.append(mp.Process(None,G_Sim,(lmbda,mu,c,skip_cost,simulation_time,Policy,warmup_period,False,)))
for j in jobs:
    j.start()
    j.join()

I get an assertion Error: Name must be a string

Answer 1

The mp.Process() function call is defined as below:

multiprocessing.Process([group[, target[, name[, args[, kwargs]]]]])

The third argument should be a name for the process, as a string. You are passing the following tuple:
(lmbda,mu,c,skip_cost,simulation_time,Policy,warmup_period,False,)

You should name your arguments. Something like:

jobs.append(mp.Process(group=None, target=G_Sim, args=(lmbda,mu,c,skip_cost,simulation_time,Policy,warmup_period,False,)))