Ifpack2_Details_TriDiSolver_decl.hpp

// @HEADER
// *****************************************************************************
//       Ifpack2: Templated Object-Oriented Algebraic Preconditioner Package
//
// Copyright 2009 NTESS and the Ifpack2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER
 
#ifndef IFPACK2_DETAILS_TRIDISOLVER_DECL_HPP
#define IFPACK2_DETAILS_TRIDISOLVER_DECL_HPP

 
#include "Ifpack2_ConfigDefs.hpp"
#include "Ifpack2_Preconditioner.hpp"
#include "Ifpack2_Details_CanChangeMatrix.hpp"
#include "Ifpack2_Details_LapackSupportsScalar.hpp"
#include "Tpetra_RowMatrix.hpp"
#include "Tpetra_Import_fwd.hpp"
#include "Tpetra_Export_fwd.hpp"
#include "Teuchos_SerialTriDiMatrix.hpp"
#include <type_traits>
 
namespace Ifpack2 {
namespace Details {

template<class MatrixType,
         const bool stub = ! LapackSupportsScalar<typename MatrixType::scalar_type>::value>
class TriDiSolver :
    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> >
{};

template<class MatrixType>
class TriDiSolver<MatrixType, false> :
    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 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::Details::TriDiSolver: The template parameter MatrixType must be a Tpetra::RowMatrix specialization.  Please don't use Tpetra::CrsMatrix (a subclass of Tpetra::RowMatrix) here anymore.  The constructor can take either a RowMatrix or a CrsMatrix just fine.");
 
  typedef typename row_matrix_type::nonconst_global_inds_host_view_type nonconst_global_inds_host_view_type;
  typedef typename row_matrix_type::nonconst_local_inds_host_view_type nonconst_local_inds_host_view_type;
  typedef typename row_matrix_type::nonconst_values_host_view_type nonconst_values_host_view_type;

  typedef Tpetra::Map<local_ordinal_type, global_ordinal_type, node_type> map_type;



  TriDiSolver (const Teuchos::RCP<const row_matrix_type>& matrix);

  virtual ~TriDiSolver ();


 

  Teuchos::RCP<const map_type> getDomainMap () const;

  Teuchos::RCP<const map_type> getRangeMap () const;

  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;


  void setParameters (const Teuchos::ParameterList& params);

  void initialize ();

  bool isInitialized () const;

  void compute ();

  bool isComputed () const;

  Teuchos::RCP<const row_matrix_type> getMatrix () const;

  void setMatrix (const Teuchos::RCP<const row_matrix_type>& A);

  int getNumInitialize () const;

  int getNumCompute () const;

  int getNumApply() const;

  double getInitializeTime() const;

  double getComputeTime() const;

  double getApplyTime() const;



  std::string description () const;

  void
  describe (Teuchos::FancyOStream &out,
            const Teuchos::EVerbosityLevel verbLevel =
            Teuchos::Describable::verbLevel_default) const;
private:

  void
  describeLocal (Teuchos::FancyOStream& out,
                 const Teuchos::EVerbosityLevel verbLevel) const;

  void reset ();

  static void
  extract (Teuchos::SerialTriDiMatrix<int, scalar_type>& A_local_tridi,
           const row_matrix_type& A_local);

  static void
  factor (Teuchos::SerialTriDiMatrix<int, scalar_type>& A,
          const Teuchos::ArrayView<int>& ipiv);

  typedef Tpetra::MultiVector<scalar_type, local_ordinal_type,
                              global_ordinal_type, node_type> MV;

  typedef Tpetra::Import<local_ordinal_type,
                         global_ordinal_type, node_type> import_type;

  typedef Tpetra::Export<local_ordinal_type,
                         global_ordinal_type, node_type> export_type;

  typedef Teuchos::ScalarTraits<scalar_type> STS;

  void
  applyImpl (const MV& X,
             MV& Y,
             const Teuchos::ETransp mode,
             const scalar_type alpha,
             const scalar_type beta) const;

  Teuchos::RCP<const row_matrix_type> A_;

  Teuchos::RCP<const row_matrix_type> A_local_;

  Teuchos::SerialTriDiMatrix<int, scalar_type> A_local_tridi_;

  Teuchos::Array<int> ipiv_;

  double initializeTime_;

  double computeTime_;

  mutable double applyTime_;

  int numInitialize_;

  int numCompute_;

  mutable int numApply_;

  bool isInitialized_;

  bool isComputed_;
};
 

template<class MatrixType>
class TriDiSolver<MatrixType, true> :
    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 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::Details::TriDiSolver: The template parameter MatrixType must be a Tpetra::RowMatrix specialization.  Please don't use Tpetra::CrsMatrix (a subclass of Tpetra::RowMatrix) here anymore.  The constructor can take either a RowMatrix or a CrsMatrix just fine.");

  typedef Tpetra::Map<local_ordinal_type, global_ordinal_type, node_type> map_type;



  TriDiSolver (const Teuchos::RCP<const row_matrix_type>& matrix);

  virtual ~TriDiSolver ();



  Teuchos::RCP<const map_type> getDomainMap () const;

  Teuchos::RCP<const map_type> getRangeMap () const;

  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;


  void setParameters (const Teuchos::ParameterList& params);

  void initialize ();

  bool isInitialized () const;

  void compute ();

  bool isComputed () const;

  Teuchos::RCP<const row_matrix_type> getMatrix () const;

  void setMatrix (const Teuchos::RCP<const row_matrix_type>& A);

  int getNumInitialize () const;

  int getNumCompute () const;

  int getNumApply() const;

  double getInitializeTime() const;

  double getComputeTime() const;

  double getApplyTime() const;



  std::string description () const;

  void
  describe (Teuchos::FancyOStream &out,
            const Teuchos::EVerbosityLevel verbLevel =
            Teuchos::Describable::verbLevel_default) const;
 
  void
  describeLocal (Teuchos::FancyOStream& out,
                      const Teuchos::EVerbosityLevel verbLevel) const;

private:
  typedef Tpetra::MultiVector<scalar_type, local_ordinal_type,
                              global_ordinal_type, node_type> MV;
};
 
} // namespace Details
} // namespace Ifpack2
 
#endif // IFPACK2_DETAILS_TRIDISOLVER_DECL_HPP