#!/usr/bin/env python3

import os
import multiprocessing

LIMIT = 100
PATH = "/"

class Finished(Exception): pass


def main():
    filenames = []
    try:
        for root, dirs, files in os.walk(PATH):
            for filename in files:
                filenames.append(os.path.join(root, filename))
                if len(filenames) >= LIMIT:
                    raise Finished()
    except Finished:
        pass
    print("{0} files, ".format(len(filenames)), end="")

    pool = multiprocessing.Pool()
    result = pool.map_async(get_size, filenames)
    pool.close()
    pool.join()
    print("{0} bytes".format(sum(result.get())))


def get_size(filename):
    try:
        return os.path.getsize(filename)
    except EnvironmentError:
        pass
    return 0


main()