timing replicates with msprime

gistfile1.txt

import time
import msprime
now = time.clock()
theta=2
nsamp=100
m = 0.1
numReps=100
for i in list(range(numReps)):
    ts = msprime.simulate(
        Ne=1/2,
        population_configurations=[
        msprime.PopulationConfiguration(sample_size=nsamp),
        msprime.PopulationConfiguration(sample_size=nsamp)],
        migration_matrix=[[0, m], [m, 0]],
        mutation_rate=theta / 2)
print('time w/o num_reps: {}'.format(str(time.clock()-now)))

now = time.clock()
ts = msprime.simulate(
        Ne=1/2,
        population_configurations=[
        msprime.PopulationConfiguration(sample_size=nsamp),
        msprime.PopulationConfiguration(sample_size=nsamp)],
        migration_matrix=[[0, m], [m, 0]],
        mutation_rate=theta / 2, num_replicates=numReps)
for tree in ts:
    pass

print('time w/ num_reps: {}'.format(str(time.clock()-now)))

#time w/o num_reps: 0.2576809999999998
#time w/ num_reps: 0.03723999999999972