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# ==============================================================================
# This file is part of the "Parallel Location and Exchange" library,
# intended to provide mesh or particle-based code coupling services.
#
# Copyright (C) 2005-2019 EDF S.A.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# ==============================================================================
# ==============================================================================
# MPI UTILITIES FOR EASIER USE BY EXTERNAL CODES
# ==============================================================================
# ==============================================================================
def mpi_initialized():
"""
This function checks if the python script was launched with MPI.
"""
try:
import mpi4py
except ImportError:
return False
try:
import mpi4py.MPI
except ImportError:
return False
if mpi4py.MPI.COMM_WORLD.size == 1 and mpi4py.MPI.COMM_WORLD.rank == 0:
return False
return True
# ==============================================================================
# ==============================================================================
def get_comm_world():
"""
This function returns the MPI_COMM_WORLD communicator which can then
be used in Python for the different MPI operations.
"""
from mpi4py import MPI
base_comm = MPI.COMM_WORLD
return base_comm
# ==============================================================================
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