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# Copyright (C) 2017 Garth N. Wells
#
# This file is part of DOLFINx (https://www.fenicsproject.org)
#
# SPDX-License-Identifier: LGPL-3.0-or-later
"""Unit tests for MPI facilities"""
import sys
from mpi4py import MPI
from dolfinx.mesh import create_unit_square
def test_mpi_comm_wrapper():
"""Test MPICommWrapper <-> mpi4py.MPI.Comm conversion"""
comm0 = MPI.COMM_WORLD
m = create_unit_square(comm0, 4, 4)
comm1 = m.comm
assert isinstance(comm0, MPI.Comm)
assert isinstance(comm1, MPI.Comm)
def test_mpi_comm_refcount():
"""Test MPICommWrapper <-> mpi4py.MPI.Comm reference counting"""
comm0 = MPI.COMM_WORLD
m = create_unit_square(comm0, 4, 4)
comm1 = m.comm
assert comm1 != comm0
comm2 = m.comm
assert comm2 == comm1
del m
assert sys.getrefcount(comm1) == 2
assert comm1.rank == comm0.rank
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