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# Copyright (C) 2006 Douglas Gregor <doug.gregor -at- gmail.com>.
# Use, modification and distribution is subject to the Boost Software
# License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
# Test reduce() collective.
from __future__ import print_function
import mpi
from generators import *
def reduce_test(comm, generator, kind, op, op_kind, root):
if comm.rank == root:
print ("Reducing to %s of %s at root %d..." % (op_kind, kind, root)),
my_value = generator(comm.rank)
result = mpi.reduce(comm, my_value, op, root)
if comm.rank == root:
expected_result = generator(0);
for p in range(1, comm.size):
expected_result = op(expected_result, generator(p))
assert result == expected_result
print ("OK.")
else:
assert result == None
return
reduce_test(mpi.world, int_generator, "integers", lambda x,y:x + y, "sum", 0)
reduce_test(mpi.world, int_generator, "integers", lambda x,y:x * y, "product", 1)
reduce_test(mpi.world, int_generator, "integers", min, "minimum", 0)
reduce_test(mpi.world, string_generator, "strings", lambda x,y:x + y, "concatenation", 0)
reduce_test(mpi.world, string_list_generator, "list of strings", lambda x,y:x + y, "concatenation", 0)
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