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# mpiexec -n 2 python ex-2.01.py
# Process 0 sends a message to process 1
# --------------------------------------------------------------------
import array
from mpi4py import MPI
if MPI.COMM_WORLD.Get_size() < 2:
raise SystemExit from None
# --------------------------------------------------------------------
s = b"Hello there"
msg = array.array("B", b"\0" * 20)
tag = 99
status = MPI.Status()
myrank = MPI.COMM_WORLD.Get_rank()
if myrank == 0:
msg[: len(s)] = array.array("B", s)
MPI.COMM_WORLD.Send([msg, len(s) + 1, MPI.CHAR], 1, tag)
elif myrank == 1:
MPI.COMM_WORLD.Recv([msg, 20, MPI.CHAR], 0, tag, status)
# --------------------------------------------------------------------
if myrank == 1:
assert list(msg[: len(s)]) == list(s)
assert msg[len(s)] == 0
assert status.source == 0
assert status.tag == tag
assert status.error == MPI.SUCCESS
assert status.Get_count(MPI.CHAR) == len(s) + 1
# --------------------------------------------------------------------
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