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mpi_test_fft_engine.cc
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/**
* @file mpi_test_fft_engine.cc
*
* @author Lars Pastewka <lars.pastewka@imtek.uni-freiburg.de>
*
* @date 06 Mar 2017
*
* @brief tests for MPI-parallel fft engine implementations
*
* Copyright © 2017 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 GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <boost/mpl/list.hpp>
#include "tests.hh"
#include "mpi_context.hh"
#include "fft/fftwmpi_engine.hh"
#include "common/ccoord_operations.hh"
#include "common/field_collection.hh"
#include "common/field_map.hh"
#include "common/iterators.hh"
namespace muSpectre {
BOOST_AUTO_TEST_SUITE(fftwmpi_engine);
/* ---------------------------------------------------------------------- */
template <typename Engine, Dim_t resolution>
struct FFTW_fixture {
constexpr static Dim_t box_resolution{resolution};
constexpr static Real box_length{4.5};
constexpr static Dim_t sdim{Engine::sdim};
constexpr static Dim_t mdim{Engine::mdim};
constexpr static Ccoord_t<sdim> res() {
return CcoordOps::get_cube<sdim>(box_resolution);
}
FFTW_fixture(): engine(res(), CcoordOps::get_cube<sdim>(box_length),
MPIContext::get_context().comm) {}
Engine engine;
};
template <typename Engine>
struct FFTW_fixture_python_segfault{
constexpr static Dim_t dim{twoD};
constexpr static Dim_t sdim{twoD};
constexpr static Dim_t mdim{twoD};
constexpr static Ccoord_t<sdim> res() {return {6, 4};}
FFTW_fixture_python_segfault():
engine{res(), {3., 3}, MPIContext::get_context().comm} {}
Engine engine;
};
using fixlist = boost::mpl::list<FFTW_fixture<FFTWMPIEngine< twoD, twoD>, 3>,
FFTW_fixture<FFTWMPIEngine< twoD, threeD>, 3>,
FFTW_fixture<FFTWMPIEngine<threeD, threeD>, 3>,
FFTW_fixture<FFTWMPIEngine< twoD, twoD>, 4>,
FFTW_fixture<FFTWMPIEngine< twoD, threeD>, 4>,
FFTW_fixture<FFTWMPIEngine<threeD, threeD>, 4>,
FFTW_fixture_python_segfault<FFTWMPIEngine<twoD, twoD>>>;
/* ---------------------------------------------------------------------- */
BOOST_FIXTURE_TEST_CASE_TEMPLATE(Constructor_test, Fix, fixlist, Fix) {
Communicator &comm = MPIContext::get_context().comm;
BOOST_CHECK_NO_THROW(Fix::engine.initialise(FFT_PlanFlags::estimate));
BOOST_CHECK_EQUAL(comm.sum(Fix::engine.size()),
CcoordOps::get_size(Fix::res()));
}
/* ---------------------------------------------------------------------- */
BOOST_FIXTURE_TEST_CASE_TEMPLATE(fft_test, Fix, fixlist, Fix) {
Fix::engine.initialise(FFT_PlanFlags::estimate);
constexpr Dim_t order{2};
using FC_t = GlobalFieldCollection<Fix::sdim, Fix::mdim>;
FC_t fc;
auto & input{make_field<TensorField<FC_t, Real, order, Fix::mdim>>("input", fc)};
auto & ref {make_field<TensorField<FC_t, Real, order, Fix::mdim>>("reference", fc)};
auto & result{make_field<TensorField<FC_t, Real, order, Fix::mdim>>("result", fc)};
fc.initialise(Fix::engine.get_resolutions());
using map_t = MatrixFieldMap<FC_t, Real, Fix::mdim, Fix::mdim>;
map_t inmap{input};
auto refmap{map_t{ref}};
auto resultmap{map_t{result}};
size_t cntr{0};
for (auto tup: akantu::zip(inmap, refmap)) {
cntr++;
auto & in_{std::get<0>(tup)};
auto & ref_{std::get<1>(tup)};
in_.setRandom();
ref_ = in_;
}
auto & complex_field = Fix::engine.fft(input);
using cmap_t = MatrixFieldMap<LocalFieldCollection<Fix::sdim, Fix::mdim>, Complex, Fix::mdim, Fix::mdim>;
cmap_t complex_map(complex_field);
Real error = complex_map[0].imag().norm();
BOOST_CHECK_LT(error, tol);
/* make sure, the engine has not modified input (which is
unfortunately const-casted internally, hence this test) */
for (auto && tup: akantu::zip(inmap, refmap)) {
Real error{(std::get<0>(tup) - std::get<1>(tup)).norm()};
BOOST_CHECK_LT(error, tol);
}
/* make sure that the ifft of fft returns the original*/
Fix::engine.ifft(result);
for (auto && tup: akantu::zip(resultmap, refmap)) {
Real error{(std::get<0>(tup)*Fix::engine.normalisation() - std::get<1>(tup)).norm()};
BOOST_CHECK_LT(error, tol);
if (error > tol) {
std::cout << std::get<0>(tup).array()/std::get<1>(tup).array() << std::endl << std::endl;
}
}
}
BOOST_AUTO_TEST_SUITE_END();
} // muSpectre

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