# computes the  sqrt of a very many integers in parallel
import multiprocessing as mp
import numpy as np
from time import time as T



def main():
    res = []
    arg = np.arange(1000000)
    for nproc in range(1,13):
        if nproc==1:
            tic = T()
            root = np.sqrt(arg)
            toc = T()-tic
        else:
            tic = T()            
            with mp.Pool(nproc) as pool:
                root = pool.map(np.sqrt,arg)
            toc = T()-tic
        print(nproc,toc)

if __name__ == '__main__':
    main()