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__init__.py
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#
# @file __init__.py
#
# @author Lars Pastewka <lars.pastewka@imtek.uni-freiburg.de>
#
# @date 21 Mar 2018
#
# @brief Main entry point for muSpectre Python module
#
# Copyright © 2018 Till Junge
#
# µSpectre is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation, either version 3, or (at
# your option) any later version.
#
# µSpectre 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with µSpectre; see the file COPYING. If not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
try:
from mpi4py import MPI
except ImportError:
MPI = None
import _muSpectre
from _muSpectre import (Formulation, get_domain_ccoord, get_domain_index,
get_hermitian_sizes, material, solvers)
import muSpectre.fft
_factories = {'fftw': ('CellFactory', False),
'fftwmpi': ('FFTWMPICellFactory', True),
'pfft': ('PFFTCellFactory', True),
'p3dfft': ('P3DFFTCellFactory', True)}
def Cell(resolutions, lengths, formulation=Formulation.finite_strain,
fft='fftw', communicator=None):
"""
Instantiate a muSpectre Cell class.
Parameters
----------
resolutions: list
Grid resolutions in the Cartesian directions.
lengths: list
Physical size of the cell in the Cartesian directions.
formulation: Formulation
Formulation for strains and stresses used by the solver. Options are
`Formulation.finite_strain` and `Formulation.small_strain`. Finite
strain formulation is the default.
fft: string
FFT engine to use. Options are 'fftw', 'fftwmpi', 'pfft' and 'p3dfft'.
Default is 'fftw'.
communicator: mpi4py communicator
mpi4py communicator object passed to parallel FFT engines. Note that
the default 'fftw' engine does not support parallel execution.
Returns
-------
cell: object
Return a muSpectre Cell object.
"""
try:
factory_name, is_parallel = _factories[fft]
except KeyError:
raise KeyError("Unknown FFT engine '{}'.".format(fft))
try:
factory = _muSpectre.__dict__[factory_name]
except KeyError:
raise KeyError("FFT engine '{}' has not been compiled into the "
"muSpectre library.".format(fft))
if is_parallel:
if MPI is None:
raise RuntimeError('Parallel solver requested but mpi4py could'
' not be imported.')
if communicator is None:
communicator = MPI.COMM_SELF
return factory(resolutions, lengths, formulation,
MPI._handleof(communicator))
else:
if communicator is not None:
raise ValueError("FFT engine '{}' does not support parallel "
"execution.".format(fft))
return factory(resolutions, lengths, formulation)

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