Ifpack2_Hiptmair_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_HIPTMAIR_DECL_HPP
#define IFPACK2_HIPTMAIR_DECL_HPP

#include "Ifpack2_Preconditioner.hpp"
#include "Tpetra_Map_fwd.hpp"
#include <type_traits>

namespace Teuchos {
  class ParameterList; // forward declaration
}

namespace Ifpack2 {

  template<class MatrixType>
  class Hiptmair :
    virtual public Ifpack2::Preconditioner<typename MatrixType::scalar_type,
                                           typename MatrixType::local_ordinal_type,
                                           typename MatrixType::global_ordinal_type,
                                           typename MatrixType::node_type>
  {
  public:
    // \name Public typedefs

    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::Hiptmair: 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 Ifpack2::Preconditioner<scalar_type,
                                    local_ordinal_type,
                                    global_ordinal_type,
                                    node_type> prec_type;

    // \name Constructors and Destructors

    explicit Hiptmair (const Teuchos::RCP<const row_matrix_type>& A);


    explicit Hiptmair (const Teuchos::RCP<const row_matrix_type>& A,
                       const Teuchos::RCP<const row_matrix_type>& PtAP,
                       const Teuchos::RCP<const row_matrix_type>& P,
                       const Teuchos::RCP<const row_matrix_type>& Pt=Teuchos::null);

    virtual ~Hiptmair ();



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

    bool supportsZeroStartingSolution() { return true; }

    void setZeroStartingSolution (bool zeroStartingSolution) { ZeroStartingSolution_ = zeroStartingSolution; };

    void initialize ();

    inline bool isInitialized () const {
      return IsInitialized_;
    }

    void compute ();

    inline bool isComputed() const {
      return IsComputed_;
    }



    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
    applyHiptmairSmoother(const Tpetra::MultiVector<typename MatrixType::scalar_type,
                          typename MatrixType::local_ordinal_type,
                          typename MatrixType::global_ordinal_type,
                          typename MatrixType::node_type>& X,
                          Tpetra::MultiVector<typename MatrixType::scalar_type,
                          typename MatrixType::local_ordinal_type,
                          typename MatrixType::global_ordinal_type,
                          typename MatrixType::node_type>& Y) const;

    void updateCachedMultiVectors(const Teuchos::RCP<const Tpetra::Map<local_ordinal_type,global_ordinal_type,node_type> >& map1,
                                  const Teuchos::RCP<const Tpetra::Map<local_ordinal_type, global_ordinal_type, node_type>>& map2,
                                  size_t numVecs) const;

    Teuchos::RCP<const Tpetra::Map<local_ordinal_type,global_ordinal_type,node_type> > getDomainMap() const;

    Teuchos::RCP<const Tpetra::Map<local_ordinal_type,global_ordinal_type,node_type> > getRangeMap() const;

    bool hasTransposeApply() const;



    Teuchos::RCP<const Teuchos::Comm<int> > getComm() const;

    Teuchos::RCP<const Tpetra::RowMatrix<scalar_type,local_ordinal_type,global_ordinal_type,node_type> > getMatrix() const;

    int getNumInitialize() const;

    int getNumCompute() const;

    int getNumApply() const;

    double getInitializeTime() const;

    double getComputeTime() const;

    double getApplyTime() const;

    Teuchos::RCP<Ifpack2::Preconditioner<typename MatrixType::scalar_type,typename MatrixType::local_ordinal_type,typename MatrixType::global_ordinal_type,typename MatrixType::node_type> > getPrec1();

    Teuchos::RCP<Ifpack2::Preconditioner<typename MatrixType::scalar_type,typename MatrixType::local_ordinal_type,typename MatrixType::global_ordinal_type,typename MatrixType::node_type> > getPrec2();



    std::string description() const;

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


  private:
    typedef Teuchos::ScalarTraits<scalar_type> STS;
    typedef Teuchos::ScalarTraits<magnitude_type> STM;

    Hiptmair (const Hiptmair<MatrixType>& RHS);

    Hiptmair<MatrixType>& operator= (const Hiptmair<MatrixType>& RHS);

    //  A - matrix in primary space
    //  PtAP - matrix in auxiliary space
    //  P  - prolongator matrix
    Teuchos::RCP<const row_matrix_type> A_, PtAP_, P_, Pt_;

    std::string precType1_, precType2_, preOrPost_;

    bool ZeroStartingSolution_;

    bool ImplicitTranspose_;

    Teuchos::ParameterList precList1_, precList2_;

    bool IsInitialized_;
    bool IsComputed_;
    int NumInitialize_;
    int NumCompute_;
    mutable int NumApply_;
    double InitializeTime_;
    double ComputeTime_;
    mutable double ApplyTime_;
    Teuchos::RCP<prec_type> ifpack2_prec1_, ifpack2_prec2_;
    mutable Teuchos::RCP<Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> > cachedResidual1_;
    mutable Teuchos::RCP<Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> > cachedSolution1_;
    mutable Teuchos::RCP<Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> > cachedResidual2_;
    mutable Teuchos::RCP<Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> > cachedSolution2_;
  };

} // namespace Ifpack2

#endif // IFPACK2_HIPTMAIR_DECL_HPP