Ifpack2_OverlappingRowMatrix_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_OVERLAPPINGROWMATRIX_DECL_HPP
#define IFPACK2_OVERLAPPINGROWMATRIX_DECL_HPP

#include "Ifpack2_Details_RowMatrix.hpp"
#include "Tpetra_CrsMatrix_decl.hpp" // only need the declaration here
#include "Tpetra_Import_decl.hpp"
#include "Tpetra_Map_decl.hpp"
#include <type_traits>

namespace Ifpack2 {

template<class MatrixType>
class OverlappingRowMatrix :
    virtual public Ifpack2::Details::RowMatrix<MatrixType> {
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 typename MatrixType::global_inds_host_view_type global_inds_host_view_type;
  typedef typename MatrixType::local_inds_host_view_type local_inds_host_view_type;
  typedef typename MatrixType::values_host_view_type values_host_view_type;

  typedef typename MatrixType::nonconst_global_inds_host_view_type nonconst_global_inds_host_view_type;
  typedef typename MatrixType::nonconst_local_inds_host_view_type nonconst_local_inds_host_view_type;
  typedef typename MatrixType::nonconst_values_host_view_type nonconst_values_host_view_type;

  using row_matrix_type = Tpetra::RowMatrix<scalar_type, local_ordinal_type,
              global_ordinal_type, node_type>;
  using crs_matrix_type = Tpetra::CrsMatrix<scalar_type, local_ordinal_type,
              global_ordinal_type, node_type>;

  // device typedefs
  typedef typename MatrixType::node_type::device_type device_type;
  typedef typename device_type::execution_space execution_space;
  typedef typename MatrixType::local_inds_device_view_type local_inds_device_view_type;
  typedef typename MatrixType::global_inds_device_view_type global_inds_device_view_type;
  typedef typename MatrixType::values_device_view_type values_device_view_type;

  static_assert(std::is_same<MatrixType, row_matrix_type>::value, "Ifpack2::OverlappingRowMatrix: 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::mag_type mag_type;



  OverlappingRowMatrix (const Teuchos::RCP<const row_matrix_type>& A,
                        const int overlapLevel);

  ~OverlappingRowMatrix () = default;



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


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

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

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

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

  virtual Teuchos::RCP<const Tpetra::RowGraph<local_ordinal_type, global_ordinal_type, node_type> >
  getGraph () const;

  virtual global_size_t getGlobalNumRows () const;

  virtual global_size_t getGlobalNumCols () const;

  virtual size_t getLocalNumRows () const;

  virtual size_t getLocalNumCols () const;

  virtual global_ordinal_type getIndexBase () const;

  virtual global_size_t getGlobalNumEntries () const;

  virtual size_t getLocalNumEntries () const;

  virtual size_t getNumEntriesInGlobalRow (global_ordinal_type globalRow) const;

  virtual size_t getNumEntriesInLocalRow (local_ordinal_type localRow) const;

  virtual size_t getGlobalMaxNumRowEntries () const;

  virtual size_t getLocalMaxNumRowEntries() const;
  
  virtual local_ordinal_type getBlockSize () const;

  virtual bool hasColMap() const;

  virtual bool isLocallyIndexed () const;

  virtual bool isGloballyIndexed () const;

  virtual bool isFillComplete() const;

  virtual bool supportsRowViews() const;




  virtual void
  getGlobalRowCopy (global_ordinal_type GlobalRow,
                    nonconst_global_inds_host_view_type &Indices,
                    nonconst_values_host_view_type &Values,
                    size_t& NumEntries) const;


  virtual void
  getLocalRowCopy (local_ordinal_type LocalRow,
                   nonconst_local_inds_host_view_type &Indices,
                   nonconst_values_host_view_type &Values,
                   size_t& NumEntries) const;


  virtual void
  getGlobalRowView (global_ordinal_type GlobalRow,
                    global_inds_host_view_type &indices,
                    values_host_view_type &values) const;


 virtual void
  getLocalRowView (local_ordinal_type LocalRow,
                   local_inds_host_view_type & indices,
                   values_host_view_type & values) const;


  virtual
  void getLocalDiagCopy (Tpetra::Vector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> &diag) const;



  virtual void
  leftScale (const Tpetra::Vector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& x);

  virtual void
  rightScale (const Tpetra::Vector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& x);


  virtual mag_type
  getFrobeniusNorm () const;


  virtual 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;

  virtual bool hasTransposeApply() const;

  virtual void
  importMultiVector (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> &OvX,
                     Tpetra::CombineMode CM = Tpetra::INSERT);

  virtual void
  exportMultiVector (const Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> &OvX,
                     Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> &X,
                     Tpetra::CombineMode CM = Tpetra::ADD);

  std::string description() const;

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

  Teuchos::RCP<const crs_matrix_type> getUnderlyingMatrix() const;

  Teuchos::RCP<const crs_matrix_type> getExtMatrix() const;

  Kokkos::View<size_t*, typename OverlappingRowMatrix<MatrixType>::device_type> getExtHaloStarts() const;
  typename Kokkos::View<size_t*, typename OverlappingRowMatrix<MatrixType>::device_type>::HostMirror getExtHaloStartsHost() const;

  void doExtImport();

private:
  typedef Tpetra::Map<local_ordinal_type, global_ordinal_type, node_type> map_type;
  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 Tpetra::RowGraph<local_ordinal_type, global_ordinal_type, node_type> row_graph_type;
  typedef Tpetra::Vector<scalar_type, local_ordinal_type, global_ordinal_type, node_type> vector_type;

  Teuchos::RCP<const crs_matrix_type> A_;

  Tpetra::global_size_t NumGlobalRows_;
  Tpetra::global_size_t NumGlobalNonzeros_;
  size_t MaxNumEntries_;
  int OverlapLevel_;

  // Wrapper matrix objects
  Teuchos::RCP<const map_type> RowMap_;
  Teuchos::RCP<const map_type> ColMap_;
  Teuchos::RCP<const import_type> Importer_;

  Teuchos::RCP<crs_matrix_type> ExtMatrix_;
  Teuchos::RCP<const map_type>        ExtMap_;
  Teuchos::RCP<const import_type>     ExtImporter_;
  Kokkos::View<size_t*, device_type>  ExtHaloStarts_;
  typename Kokkos::View<size_t*, device_type>::HostMirror ExtHaloStarts_h;

  Teuchos::RCP<const row_graph_type> graph_;
  mutable nonconst_local_inds_host_view_type Indices_;
  mutable nonconst_values_host_view_type Values_;


}; // class OverlappingRowMatrix

} // namespace Ifpack2

#endif // IFPACK2_OVERLAPPINGROWMATRIX_DECL_HPP