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fftw_mpi_engine.hh
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Wed, Aug 21, 12:47
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rTAMAAS tamaas
fftw_mpi_engine.hh
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-2020 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_ENGINE_HH
#define FFTW_MPI_ENGINE_HH
/* -------------------------------------------------------------------------- */
#include "fftw_engine.hh"
#include "fftw_interface.hh"
#include "grid.hh"
#include "grid_hermitian.hh"
#include <map>
/* -------------------------------------------------------------------------- */
namespace
tamaas
{
class
FFTWMPIEngine
:
public
FFTWEngine
{
public
:
using
FFTWEngine
::
FFTWEngine
;
void
forward
(
Grid
<
Real
,
1
>&
/*real*/
,
GridHermitian
<
Real
,
1
>&
/*spectral*/
)
override
{
TAMAAS_EXCEPTION
(
"FFTW/MPI does not support 1D transforms"
);
}
void
backward
(
Grid
<
Real
,
1
>&
/*real*/
,
GridHermitian
<
Real
,
1
>&
/*spectral*/
)
override
{
TAMAAS_EXCEPTION
(
"FFTW/MPI does not support 1D transforms"
);
}
/// FFTW/MPI forward (r2c) transform
void
forward
(
Grid
<
Real
,
2
>&
real
,
GridHermitian
<
Real
,
2
>&
spectral
)
override
;
/// FFTW/MPI backward (c2r) transform
void
backward
(
Grid
<
Real
,
2
>&
real
,
GridHermitian
<
Real
,
2
>&
spectral
)
override
;
protected
:
/// Make a transform signature from a pair of grids
static
key_t
make_key
(
Grid
<
Real
,
2
>&
real
,
GridHermitian
<
Real
,
2
>&
spectral
);
/// Return the plans pair for a given transform signature
plan_t
&
getPlans
(
key_t
key
);
/// Get FFTW local sizes from an hermitian grid
static
auto
local_size
(
const
key_t
&
key
);
protected
:
/// Buffer for real data because of FFTW/MPI layout
std
::
map
<
key_t
,
Grid
<
Real
,
2
>>
workspaces
;
};
}
// namespace tamaas
#endif
// FFT_MPI_ENGINE_HH
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