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I'm unable to reproduce this bug on Linux.
$ cat script.py
from multiprocessing import Pool
import os
def myfunc(x):
 import sys
 print("child", os.getpid(), "optimize?", sys.flags.optimize)
 assert False, "assert False"
 return x
if __name__ == '__main__':
 import sys
 print("parent optimize?", sys.flags.optimize)
 pool = Pool(processes=2)
 pool.map(myfunc, xrange(2)) # or imap_unordered, map
$ python -O script.py
('parent optimize?', 1)
('child', 30397, 'optimize?', 1)
('child', 30398, 'optimize?', 1)