Thread error

[epochstamp]

Hi,

I have some trouble using pyevolve's multiprocessing. Specifically, I have issue with threads. This is the error that I get :

...
File "build/bdist.linux-x86_64/egg/pyevolve/GSimpleGA.py", line 824, in evolve
File "build/bdist.linux-x86_64/egg/pyevolve/GSimpleGA.py", line 668, in step
File "build/bdist.linux-x86_64/egg/pyevolve/GPopulation.py", line 365, in evaluate
File "/usr/lib64/python2.7/multiprocessing/init.py", line 232, in Pool
return Pool(processes, initializer, initargs, maxtasksperchild)
File "/usr/lib64/python2.7/multiprocessing/pool.py", line 184, in init
self._result_handler.start()
File "/usr/lib64/python2.7/threading.py", line 746, in start
_start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread

I don't think that my code is involved in this error, but just in case :

eval func =>
def eval_gen(seq):

len_seq = len(seq)
j = 0
state = [0,0,0,0]
pmin = float("+inf")
while j < len_seq and not(is_terminal(state)) :
    a = 5 if seq[j] == 0 else -5 
    state = compute_next_state(a,state)
    cost = d(state)
    if cost <= pmin:
        pmin = cost
    j += 1
return pmin + j

GA =>

ga = GSimpleGA.GSimpleGA(genome,interactiveMode=False)
ga.setGenerations(50)
ga.setMinimax(Consts.minimaxType["minimize"])
ga.setCrossoverRate(0.5)
ga.setMutationRate(0.1)
ga.setPopulationSize(20)
ga.setMultiProcessing(True)
genome.evaluator.set(eval_gen)
ga.evolve()
seq = ga.bestIndividual()

Thanks for you help!

[epochstamp]

PS : except the pyevolve part (I mean the method ga.evolve()), all the code is monothread.