Ifpack2_Chebyshev_decl.hpp

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// @HEADER
// *****************************************************************************
//       Ifpack2: Templated Object-Oriented Algebraic Preconditioner Package
//
// Copyright 2009 NTESS and the Ifpack2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER
 
 
#ifndef IFPACK2_CHEBYSHEV_DECL_HPP
#define IFPACK2_CHEBYSHEV_DECL_HPP
 
#include "Ifpack2_Preconditioner.hpp"
#include "Ifpack2_Details_CanChangeMatrix.hpp"
 
// FIXME (mfh 20 Nov 2013) We really shouldn't have to include this.
// We should handle the implementation by pointer instead of by value.
#include "Ifpack2_Details_Chebyshev.hpp"
 
// We only need the declaration here, and only for the method
// getCrsMatrix.  I would very much prefer that this method not exist.
// Furthermore, it is both unsafe (MatrixType need not be CrsMatrix)
// and completely redundant (just call getMatrix() and do the
// dynamic_cast yourself).
#include "Tpetra_CrsMatrix_decl.hpp"
 
#include <type_traits>
 
namespace Ifpack2 {
 
template <class MatrixType>
class Chebyshev : virtual public Ifpack2::Preconditioner<typename MatrixType::scalar_type,
                                                         typename MatrixType::local_ordinal_type,
                                                         typename MatrixType::global_ordinal_type,
                                                         typename MatrixType::node_type>,
                  virtual public Ifpack2::Details::CanChangeMatrix<Tpetra::RowMatrix<typename MatrixType::scalar_type,
                                                                                     typename MatrixType::local_ordinal_type,
                                                                                     typename MatrixType::global_ordinal_type,
                                                                                     typename MatrixType::node_type> > {
 public:
 
 
  typedef MatrixType matrix_type;
 
  typedef typename MatrixType::scalar_type scalar_type;
 
  typedef typename MatrixType::local_ordinal_type local_ordinal_type;
 
  typedef typename MatrixType::global_ordinal_type global_ordinal_type;
 
  typedef typename MatrixType::node_type::device_type device_type;
 
  typedef typename MatrixType::node_type node_type;
 
  typedef typename Teuchos::ScalarTraits<scalar_type>::magnitudeType magnitude_type;
 
  typedef Tpetra::RowMatrix<scalar_type, local_ordinal_type,
                            global_ordinal_type, node_type>
      row_matrix_type;
 
  static_assert(std::is_same<MatrixType, row_matrix_type>::value,
                "Ifpack2::Chebyshev: MatrixType must be a Tpetra::RowMatrix "
                "specialization.  Don't use Tpetra::CrsMatrix here.");
 
  typedef Tpetra::Map<local_ordinal_type, global_ordinal_type, node_type> map_type;
 
  typedef Tpetra::Vector<scalar_type, local_ordinal_type,
                         global_ordinal_type, node_type>
      vector_type;
 
  // \name Constructors and destructors
 
  explicit Chebyshev(const Teuchos::RCP<const row_matrix_type>& A);
 
  virtual ~Chebyshev();
 
 
 
  void setParameters(const Teuchos::ParameterList& params);
 
  bool supportsZeroStartingSolution() { return true; }
 
  void setZeroStartingSolution(bool zeroStartingSolution);
 
  void initialize();
 
  inline bool isInitialized() const {
    return IsInitialized_;
  }
 
  void compute();
 
  inline bool isComputed() const {
    return IsComputed_;
  }
 
 
 
  virtual void
  setMatrix(const Teuchos::RCP<const row_matrix_type>& A);
 
 
 
  void
  apply(const Tpetra::MultiVector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& X,
        Tpetra::MultiVector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& Y,
        Teuchos::ETransp mode = Teuchos::NO_TRANS,
        scalar_type alpha     = Teuchos::ScalarTraits<scalar_type>::one(),
        scalar_type beta      = Teuchos::ScalarTraits<scalar_type>::zero()) const;
 
  Teuchos::RCP<const map_type> getDomainMap() const;
 
  Teuchos::RCP<const map_type> getRangeMap() const;
 
  bool hasTransposeApply() const;
 
  void
  applyMat(const Tpetra::MultiVector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& X,
           Tpetra::MultiVector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& Y,
           Teuchos::ETransp mode = Teuchos::NO_TRANS) const;
 
 
 
  Teuchos::RCP<const Teuchos::Comm<int> > getComm() const;
 
  Teuchos::RCP<const row_matrix_type> getMatrix() const;
 
  Teuchos::RCP<const Tpetra::CrsMatrix<scalar_type, local_ordinal_type, global_ordinal_type, node_type> >
  getCrsMatrix() const;
 
  double getComputeFlops() const;
 
  double getApplyFlops() const;
 
  int getNumInitialize() const;
 
  int getNumCompute() const;
 
  int getNumApply() const;
 
  double getInitializeTime() const;
 
  double getComputeTime() const;
 
  double getApplyTime() const;
 
  size_t getNodeSmootherComplexity() const;
 
  typename MatrixType::scalar_type getLambdaMaxForApply() const;
 
 
 
  std::string description() const;
 
  void describe(Teuchos::FancyOStream& out, const Teuchos::EVerbosityLevel verbLevel = Teuchos::Describable::verbLevel_default) const;
 
 
 private:
  typedef Teuchos::ScalarTraits<typename MatrixType::scalar_type> STS;
 
  typedef Tpetra::MultiVector<scalar_type, local_ordinal_type, global_ordinal_type, node_type> MV;
 
  Chebyshev(const Chebyshev<MatrixType>&);
 
  Chebyshev<MatrixType>& operator=(const Chebyshev<MatrixType>&);
 
  void
  applyImpl(const MV& X,
            MV& Y,
            Teuchos::ETransp mode,
            scalar_type alpha,
            scalar_type beta) const;
 
 
 
  mutable Details::Chebyshev<scalar_type, MV> impl_;
 
  bool IsInitialized_;
  bool IsComputed_;
  int NumInitialize_;
  int NumCompute_;
  bool TimerForApply_;
  mutable int NumApply_;
  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyTime_;
  double ComputeFlops_;
  mutable double ApplyFlops_;
 
};  // class Chebyshev
 
}  // namespace Ifpack2
 
#endif  // IFPACK2_CHEBYSHEV_DECL_HPP