Hi, the multiprocess module https://github.com/uqfoundation/multiprocess is an improved version of the standard multiprocessing module. It should require >=dev-python/dill-0.2.8.2 as of now. #!/usr/bin/env python # # works in core python # import multiprocessing print multiprocessing.__version__ def f(x): return x*x pool = multiprocessing.Pool(processes=4) print pool.map(f, range(10)) pool.close() pool.join() #!/usr/bin/env python # # requires multiprocess with dill module installed import multiprocess pool = multiprocess.Pool(processes=4) print (pool.map(lambda x: (lambda y:y**2)(x) + x, xrange(10)))