A simple multiprocessing example with process pools, shared data and per-process initialization.

multiprocexample.py

""" A simple multiprocessing example with process pools, shared data and
per-process initialization. """
import multiprocessing

# global read-only data can be shared by each process
DATA = 11

def initworker(a):
	""" Initialize data specific to each process. """
	global MOREDATA
	MOREDATA = a

def worker(args):
	""" Function to compute a result in a worker process. """
	a, b = args
	return DATA / MOREDATA + a * b

if __name__ == '__main__':
	numproc = None  # None=use all available cores
	pool = multiprocessing.Pool(numproc, initworker, (42, ))
	work = [(a, b) for a, b in zip(range(5), range(5))]
	results = pool.map(worker, work)
	print results