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tamaas/src/core/fftw/mpi/interface.hh
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2021 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef FFTW_MPI_INTERFACE_HH
#define FFTW_MPI_INTERFACE_HH
/* -------------------------------------------------------------------------- */
#include "mpi_interface.hh"
#include <cstdlib>
#include <numeric>
#include <stdexcept>
#include <tuple>
#ifdef TAMAAS_USE_MPI
#include <fftw3-mpi.h>
#endif
/* -------------------------------------------------------------------------- */
namespace fftw_impl {
namespace mpi_dummy {
inline void init() {}
inline void cleanup() {}
inline auto local_size_many(int rank, const std::ptrdiff_t* size,
std::ptrdiff_t howmany) {
return std::make_tuple(howmany * std::accumulate(size, size + rank,
std::ptrdiff_t{1},
std::multiplies<void>()),
size[0], 0);
}
} // namespace mpi_dummy
#ifdef TAMAAS_USE_MPI
namespace mpi_impl {
inline void init() { fftw_mpi_init(); }
inline void cleanup() { fftw_mpi_cleanup(); }
inline auto local_size_many(int rank, const std::ptrdiff_t* size,
std::ptrdiff_t howmany) {
if (rank < 2)
throw std::domain_error("FFTW-MPI cannot be used for 1D transforms");
std::ptrdiff_t local_n0, local_n0_offset;
auto res = fftw_mpi_local_size_many(
rank, size, howmany, FFTW_MPI_DEFAULT_BLOCK, ::tamaas::mpi::comm::world(),
&local_n0, &local_n0_offset);
return std::make_tuple(res, local_n0, local_n0_offset);
}
} // namespace mpi_impl
namespace mpi = mpi_impl;
#else
namespace mpi = mpi_dummy;
#endif
} // namespace fftw
#endif
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