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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 basic communication.
from __future__ import print_function
import mpi
def ring_test(comm, value, kind, root):
next_peer = (comm.rank + 1) % comm.size;
prior_peer = (comm.rank + comm.size - 1) % comm.size;
if comm.rank == root:
print ("Passing %s around a ring from root %d..." % (kind, root)),
comm.send(next_peer, 0, value)
(other_value, stat) = comm.recv(return_status = True)
assert value == other_value
assert stat.source == prior_peer
assert stat.tag == 0
else:
msg = comm.probe()
other_value = comm.recv(msg.source, msg.tag)
assert value == other_value
comm.send(next_peer, 0, other_value)
comm.barrier()
if comm.rank == root:
print ("OK")
pass
if mpi.world.size < 2:
print ("ERROR: ring_test.py must be executed with more than one process")
mpi.world.abort(-1);
ring_test(mpi.world, 17, 'integers', 0)
ring_test(mpi.world, 17, 'integers', 1)
ring_test(mpi.world, 'Hello, World!', 'string', 0)
ring_test(mpi.world, 'Hello, World!', 'string', 1)
ring_test(mpi.world, ['Hello', 'MPI', 'Python', 'World'], 'list of strings', 0)
ring_test(mpi.world, ['Hello', 'MPI', 'Python', 'World'], 'list of strings', 1)
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