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#!/usr/bin/env python

# coding: utf-8

import subprocess

def test(size):

print('start')

cmd = 'dd if=/dev/urandom bs=1 count=%d 2>/dev/null' % size

p = subprocess.Popen(args=cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, close_fds=True)

# p.communicate()

p.wait()

print('end')

test(64*1024 + 1)