def sample(n):
    return (rand(n) ** 2 + rand(n) ** 2 <= 1).sum()

n = 1000000.
4 * sample(n) / n

from IPython.parallel import Client
rc = Client()
v = rc[:]
with v.sync_imports():
    from numpy.random import rand

4 * sum(v.map_sync(sample, [n] * len(v))) / (n * len(v))