Nette\Caching\FileStorage stress test - run it twice (or more) simultaneously

Testing...
Results:
array(5) {
   "ok" => int(1000)
   "notfound" => int(0)
   "error" => int(0)
   "cantwrite" => int(0)
   "cantdelete" => int(0)
}

PASSED
takes 2.41114187241 ms