Parallel Iterator built using Python’s multiprocessing module#

sage.parallel.multiprocessing_sage.parallel_iter(processes, f, inputs)[source]#

Return a parallel iterator.

INPUT:

  • processes – integer

  • f – function

  • inputs – an iterable of pairs (args, kwds)

OUTPUT:

  • iterator over values of f at args,kwds in some random order.

EXAMPLES:

sage: def f(x): return x+x
sage: import sage.parallel.multiprocessing_sage
sage: v = list(sage.parallel.multiprocessing_sage.parallel_iter(2, f, [((2,), {}), ((3,),{})]))
sage: v.sort(); v
[(((2,), {}), 4), (((3,), {}), 6)]

>>> from sage.all import *
>>> def f(x): return x+x
>>> import sage.parallel.multiprocessing_sage
>>> v = list(sage.parallel.multiprocessing_sage.parallel_iter(Integer(2), f, [((Integer(2),), {}), ((Integer(3),),{})]))
>>> v.sort(); v
[(((2,), {}), 4), (((3,), {}), 6)]
sage.parallel.multiprocessing_sage.pyprocessing(processes=0)[source]#

Return a parallel iterator using a given number of processes implemented using pyprocessing.

INPUT:

  • processes – integer (default: 0); if 0, set to the number of processors on the computer.

OUTPUT:

  • a (partially evaluated) function

EXAMPLES:

sage: from sage.parallel.multiprocessing_sage import pyprocessing
sage: p_iter = pyprocessing(4)
sage: P = parallel(p_iter=p_iter)
sage: def f(x): return x+x
sage: v = list(P(f)(list(range(10)))); v.sort(); v
[(((0,), {}), 0), (((1,), {}), 2), (((2,), {}), 4), (((3,), {}), 6), (((4,), {}), 8), (((5,), {}), 10), (((6,), {}), 12), (((7,), {}), 14), (((8,), {}), 16), (((9,), {}), 18)]

>>> from sage.all import *
>>> from sage.parallel.multiprocessing_sage import pyprocessing
>>> p_iter = pyprocessing(Integer(4))
>>> P = parallel(p_iter=p_iter)
>>> def f(x): return x+x
>>> v = list(P(f)(list(range(Integer(10))))); v.sort(); v
[(((0,), {}), 0), (((1,), {}), 2), (((2,), {}), 4), (((3,), {}), 6), (((4,), {}), 8), (((5,), {}), 10), (((6,), {}), 12), (((7,), {}), 14), (((8,), {}), 16), (((9,), {}), 18)]