import time

import numpy as np
from multiprocessing import Process


mem = []

def sum_(arr):
	mem.append(sum(arr))

class timer:
	def __enter__(self):
		self.start = time.clock()

	def __exit__(self, type, value, traceback):
		print(time.clock() - self.start)


if __name__ == '__main__':
	with timer() as t:
		time.sleep(10)


def donothing():
	mem.clear()
	N = 7
	with timer() as t:
		arr = np.linspace(0, 1, 10 ** N)
	wp = []

	with timer() as t:
		for i in range(2):
			p = Process(target=sum_, args=(arr[i*5*10**(N-1): (i+1)*5*10**(N-1)],))
			p.start()
			wp.append(p)
		for i in wp:
			i.join()
	mem.clear()
	with timer() as t:
		sum_(arr)