Ifpack2_BlockRelaxation_decl.hpp

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//       Ifpack2: Tempated Object-Oriented Algebraic Preconditioner Package
//                 Copyright (2009) Sandia Corporation
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#ifndef IFPACK2_BLOCKRELAXATION_DECL_HPP
#define IFPACK2_BLOCKRELAXATION_DECL_HPP

#include "Ifpack2_ConfigDefs.hpp"
#include "Ifpack2_Preconditioner.hpp"
#include "Ifpack2_Condest.hpp"
#include "Ifpack2_Parameters.hpp"
#include "Ifpack2_Partitioner.hpp"

#include <Tpetra_Vector.hpp>

#include <Teuchos_Assert.hpp>
#include <Teuchos_RCP.hpp>
#include <Teuchos_Time.hpp>
#include <Teuchos_TypeNameTraits.hpp>
#include <Teuchos_ScalarTraits.hpp>

#include <string>
#include <iostream>
#include <sstream>

namespace Teuchos {
  // forward declaration
  class ParameterList;
}

namespace Ifpack2 {
enum RelaxationType {
  JACOBI,
  GS,
  SGS
};


template<class MatrixType,class ContainerType>
class BlockRelaxation : virtual public Ifpack2::Preconditioner<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;
  typedef typename MatrixType::local_ordinal_type  LocalOrdinal;
  typedef typename MatrixType::global_ordinal_type GlobalOrdinal;
  typedef typename MatrixType::node_type           Node;
  typedef typename Teuchos::ScalarTraits<Scalar>::magnitudeType magnitudeType;

  // \name Constructors and Destructors

  explicit BlockRelaxation(const Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> >& Matrix);

  virtual ~BlockRelaxation();




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

  void initialize();

  inline bool isInitialized() const {
    return(IsInitialized_);
  }

  void compute();

  inline bool isComputed() const {
    return(IsComputed_);
  }





  void apply(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X,
             Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y,
             Teuchos::ETransp mode = Teuchos::NO_TRANS,
       Scalar alpha = Teuchos::ScalarTraits<Scalar>::one(),
       Scalar beta = Teuchos::ScalarTraits<Scalar>::zero()) const;

  const Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> >& getDomainMap() const;

  const Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> >& getRangeMap() const;

  bool hasTransposeApply() const;


  void applyMat(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X,
                Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y,
                Teuchos::ETransp mode = Teuchos::NO_TRANS) const;




  magnitudeType computeCondEst(CondestType CT = Cheap, 
                               LocalOrdinal MaxIters = 1550,
                               magnitudeType Tol = 1e-9,
                               const Teuchos::Ptr<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > &matrix = Teuchos::null);




  magnitudeType getCondEst() const;

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

  Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > getMatrix() 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;




  std::string description() const;

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


private:

  // @{ Internal methods

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

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

  virtual void ApplyInverseJacobi(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X, 
          Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y) const;

  virtual void DoJacobi(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X, 
      Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y) const;

  virtual void ApplyInverseGS(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X, 
            Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y) const;

  virtual void DoGaussSeidel(Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X, 
           Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y) const;

  virtual void ApplyInverseSGS(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X, 
             Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y) const;

  virtual void DoSGS(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& X,
         Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Xtmp,
         Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& Y) const;
 
  void ExtractSubmatrices();


  // @{ Internal data and parameters

  const Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > A_;
  Teuchos::RCP<Teuchos::Time> Time_;
  Teuchos::RCP<const Tpetra::Import<LocalOrdinal,GlobalOrdinal,Node> > Importer_;

  Teuchos::RCP<Tpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node> > W_;
  // Level of overlap among blocks (for overlapped Jacobi only).
  int OverlapLevel_;
  mutable std::vector<Teuchos::RCP<ContainerType> > Containers_;
  Teuchos::RCP<Ifpack2::Partitioner<Tpetra::RowGraph<LocalOrdinal,GlobalOrdinal,Node> > > Partitioner_;
  std::string PartitionerType_;

  Teuchos::ParameterList List_;

  int NumSweeps_;
  size_t NumLocalBlocks_;
  int PrecType_;
  Scalar MinDiagonalValue_;
  Scalar DampingFactor_;
  bool IsParallel_;
  bool ZeroStartingSolution_;
  bool DoBackwardGS_;
  magnitudeType Condest_;
  bool IsInitialized_;
  bool IsComputed_;
  int NumInitialize_;
  int NumCompute_;
  mutable int NumApply_;
  double InitializeTime_;
  double ComputeTime_;
  mutable double ApplyTime_;
  double ComputeFlops_;
  mutable double ApplyFlops_;
  size_t NumMyRows_;
  global_size_t NumGlobalRows_;
  global_size_t NumGlobalNonzeros_;


}; //class BlockRelaxation

}//namespace Ifpack2

#endif // IFPACK2_BLOCKRELAXATION_DECL_HPP