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pfft_engine.hh
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/**
* @file pfft_engine.hh
*
* @author Lars Pastewka <lars.pastewka@imtek.uni-freiburg.de>
*
* @date 06 Mar 2017
*
* @brief FFT engine using MPI-parallel PFFT
*
* 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.
*/
#ifndef PFFT_ENGINE_H
#define PFFT_ENGINE_H
#include "common/communicator.hh"
#include "fft/fft_engine_base.hh"
#include <pfft.h>
namespace muSpectre {
/**
* implements the `muSpectre::FFTEngineBase` interface using the
* FFTW library
*/
template <Dim_t DimS, Dim_t DimM>
class PFFTEngine: public FFTEngineBase<DimS, DimM>
{
public:
using Parent = FFTEngineBase<DimS, DimM>; //!< base class
using Ccoord = typename Parent::Ccoord; //!< cell coordinates type
using Rcoord = typename Parent::Rcoord; //!< spatial coordinates type
//! field for Fourier transform of second-order tensor
using Workspace_t = typename Parent::Workspace_t;
//! real-valued second-order tensor
using Field_t = typename Parent::Field_t;
//! Default constructor
PFFTEngine() = delete;
//! Constructor with system resolutions
PFFTEngine(Ccoord resolutions, Rcoord lengths,
Communicator comm=Communicator());
//! Copy constructor
PFFTEngine(const PFFTEngine &other) = delete;
//! Move constructor
PFFTEngine(PFFTEngine &&other) = default;
//! Destructor
virtual ~PFFTEngine() noexcept;
//! Copy assignment operator
PFFTEngine& operator=(const PFFTEngine &other) = delete;
//! Move assignment operator
PFFTEngine& operator=(PFFTEngine &&other) = default;
// compute the plan, etc
virtual void initialise(FFT_PlanFlags plan_flags) override;
//! forward transform
virtual Workspace_t & fft(Field_t & field) override;
//! inverse transform
virtual void ifft(Field_t & field) const override;
protected:
MPI_Comm mpi_comm; //! < MPI communicator
static int nb_engines; //!< number of times this engine has been instatiated
pfft_plan plan_fft{}; //!< holds the plan for forward fourier transform
pfft_plan plan_ifft{}; //!< holds the plan for inverse fourier transform
ptrdiff_t workspace_size{}; //!< size of workspace buffer returned by planner
Real *real_workspace{}; //!< temporary real workspace that is correctly padded
bool initialised{false}; //!< to prevent double initialisation
private:
};
} // muSpectre
#endif /* PFFT_ENGINE_H */

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