import subprocess, threading

# Params
Executable="/bin/sleep 0.1"
NumThreads = 18
NumIterations = 10

class TestClass(threading.Thread):
   def __init__(self, threadNum):
       self.threadNum = threadNum
       threading.Thread.__init__(self)
   def run(self):
       for i in range(NumIterations):
           subprocess.call(Executable.split())

def test():
   allThreads = []
   for i in range(NumThreads):
       allThreads.append(TestClass(i))
   for i in range(NumThreads):
       allThreads[i].start()
   for i in range(NumThreads):
       allThreads[i].join()
   print "Test finished"

if __name__ == '__main__':
   test()