Ifpack2_BlockRelaxation_decl.hpp

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#ifndef IFPACK2_BLOCKRELAXATION_DECL_HPP
#define IFPACK2_BLOCKRELAXATION_DECL_HPP


#include "Ifpack2_Preconditioner.hpp"
#include "Ifpack2_Partitioner.hpp"
#include "Ifpack2_Details_CanChangeMatrix.hpp"
#include "Ifpack2_ContainerFactory.hpp"
#include "Teuchos_Time.hpp"
#include "Tpetra_BlockCrsMatrix.hpp"
#include <type_traits>

namespace Ifpack2 {

template<class MatrixType, class ContainerType = Container<MatrixType> >
class BlockRelaxation :
    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 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::BlockRelaxation: Please use MatrixType = Tpetra::RowMatrix.");

  static_assert (std::is_same<ContainerType, Container<row_matrix_type> >::value,
                 "Ifpack2::BlockRelaxation: Do NOT specify the (second) "
                 "ContainerType template parameter explicitly.  The default "
                 "value is fine.  Please instead specify the container type to "
                 "use by setting the \"relaxation: container\" parameter.");

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

private:
  void computeImporter() const;


  typedef Tpetra::MultiVector<scalar_type, local_ordinal_type,
                              global_ordinal_type, node_type> MV;
  typedef Tpetra::Vector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> vector_type;
  typedef Teuchos::ScalarTraits<scalar_type> STS;
  typedef Teuchos::ScalarTraits<magnitude_type> STM;
  typedef Tpetra::BlockCrsMatrix<scalar_type, local_ordinal_type,
                                 global_ordinal_type, node_type> block_crs_matrix_type;
  typedef Tpetra::Map<local_ordinal_type, global_ordinal_type, node_type> map_type;
public:

  // \name Constructors and Destructors

  explicit BlockRelaxation (const Teuchos::RCP<const row_matrix_type>& Matrix);

  virtual ~BlockRelaxation ();




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

  Teuchos::RCP<const Teuchos::ParameterList>
  getValidParameters () const;

  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 MV& X,
             MV& 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 MV& X,
                MV& Y,
                Teuchos::ETransp mode = Teuchos::NO_TRANS) const;



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

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

  int getNumInitialize() const;

  int getNumCompute() const;

  int getNumApply() const;

  double getInitializeTime() const;

  double getComputeTime() const;

  double getApplyTime() const;

  size_t getNodeSmootherComplexity() const;  



  std::string description() const;

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


  Teuchos::RCP<Ifpack2::Partitioner<Tpetra::RowGraph<local_ordinal_type,global_ordinal_type,node_type> > > getPartitioner(){return Partitioner_;}

private:

  BlockRelaxation (const BlockRelaxation<MatrixType, ContainerType> & RHS);

  BlockRelaxation<MatrixType,ContainerType>&
  operator= (const BlockRelaxation<MatrixType, ContainerType>& RHS);

  virtual void ApplyInverseJacobi (const MV& X, MV& Y) const;

  virtual void ApplyInverseGS (const MV& X, MV& Y) const;

  virtual void ApplyInverseSGS (const MV& X, MV& Y) const;

  void ExtractSubmatricesStructure();



  Teuchos::RCP<const row_matrix_type> A_;

  Teuchos::RCP<Teuchos::Time> Time_;

  mutable Teuchos::RCP<Container<row_matrix_type> > Container_;

  // FIXME (mfh 06 Oct 2014) This doesn't comply with the naming
  // convention for instance members of a class.  Furthermore, the
  // class should keep the Vector, not the ArrayRCP to the data _in_
  // the Vector.
  // FIXED! (amk 10 Nov 2015)
  mutable Teuchos::RCP<vector_type> DiagRCP_;

  Teuchos::RCP<Ifpack2::Partitioner<Tpetra::RowGraph<local_ordinal_type,global_ordinal_type,node_type> > > Partitioner_;

  std::string PartitionerType_;

  Teuchos::ParameterList List_;

  int NumSweeps_;

  local_ordinal_type NumLocalBlocks_;

  std::string containerType_;

  Details::RelaxationType PrecType_;

  bool IsParallel_;

  bool ZeroStartingSolution_;

  bool hasBlockCrsMatrix_;

  bool DoBackwardGS_;

  int OverlapLevel_;

  scalar_type DampingFactor_;

  bool decouple_;

  bool IsInitialized_;

  bool IsComputed_;

  int NumInitialize_;

  int NumCompute_;

  mutable int NumApply_;

  double InitializeTime_;

  double ComputeTime_;

  mutable double ApplyTime_;

  local_ordinal_type NumLocalRows_;

  global_ordinal_type NumGlobalRows_;

  global_ordinal_type NumGlobalNonzeros_;

  Teuchos::RCP<vector_type> W_;

  mutable Teuchos::RCP<const Tpetra::Import<local_ordinal_type, global_ordinal_type, node_type>> Importer_;

}; //class BlockRelaxation

}//namespace Ifpack2

#endif // IFPACK2_BLOCKRELAXATION_DECL_HPP