Ifpack2_Experimental_RBILUK_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_EXPERIMENTALCRSRBILUK_DECL_HPP
#define IFPACK2_EXPERIMENTALCRSRBILUK_DECL_HPP

#include <Tpetra_BlockCrsMatrix.hpp>

#include <Ifpack2_RILUK.hpp>

namespace Ifpack2 {

namespace Experimental {

template<class MatrixType>
class RBILUK : virtual public Ifpack2::RILUK< 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::impl_scalar_type impl_scalar_type;
  typedef typename Kokkos::ArithTraits<typename MatrixType::scalar_type>::val_type impl_scalar_type;

  typedef typename MatrixType::local_ordinal_type local_ordinal_type;
  typedef typename MatrixType::local_ordinal_type LO;

  typedef typename MatrixType::global_ordinal_type global_ordinal_type;
  typedef typename MatrixType::global_ordinal_type GO;

  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;

  typedef Tpetra::CrsMatrix<scalar_type,
      local_ordinal_type,
      global_ordinal_type,
      node_type> crs_matrix_type;

  using crs_graph_type = Tpetra::CrsGraph<local_ordinal_type,
                                          global_ordinal_type,
                                          node_type>;

  typedef Tpetra::BlockCrsMatrix<scalar_type,
                            local_ordinal_type,
                            global_ordinal_type,
                            node_type> block_crs_matrix_type;

  template <class NewMatrixType> friend class RBILUK;

  typedef typename block_crs_matrix_type::nonconst_global_inds_host_view_type nonconst_global_inds_host_view_type;
  typedef typename block_crs_matrix_type::nonconst_local_inds_host_view_type nonconst_local_inds_host_view_type;
  typedef typename block_crs_matrix_type::nonconst_values_host_view_type nonconst_values_host_view_type;



  typedef typename block_crs_matrix_type::local_matrix_device_type local_matrix_device_type;
  typedef typename block_crs_matrix_type::local_matrix_host_type local_matrix_host_type;
  typedef typename local_matrix_device_type::StaticCrsGraphType::row_map_type lno_row_view_t;
  typedef typename local_matrix_device_type::StaticCrsGraphType::entries_type lno_nonzero_view_t;
  typedef typename local_matrix_device_type::values_type scalar_nonzero_view_t;
  typedef typename local_matrix_device_type::StaticCrsGraphType::device_type::memory_space TemporaryMemorySpace;
  typedef typename local_matrix_device_type::StaticCrsGraphType::device_type::memory_space PersistentMemorySpace;
  typedef typename local_matrix_device_type::StaticCrsGraphType::device_type::execution_space HandleExecSpace;
  typedef typename KokkosKernels::Experimental::KokkosKernelsHandle
      <typename lno_row_view_t::const_value_type, typename lno_nonzero_view_t::const_value_type, typename scalar_nonzero_view_t::value_type,
      HandleExecSpace, TemporaryMemorySpace,PersistentMemorySpace > kk_handle_type;
  //typedef typename KokkosKernels::Experimental::KokkosKernelsHandle
  //    <typename lno_row_view_t::non_const_value_type, typename lno_nonzero_view_t::non_const_value_type, typename scalar_nonzero_view_t::value_type,
  //    HandleExecSpace, TemporaryMemorySpace,PersistentMemorySpace > kk_handle_type;//test
  Teuchos::RCP<kk_handle_type> KernelHandle_;
  Teuchos::RCP<kk_handle_type> L_Sptrsv_KernelHandle_;
  Teuchos::RCP<kk_handle_type> U_Sptrsv_KernelHandle_;



  RBILUK (const Teuchos::RCP<const row_matrix_type>& A_in);

  RBILUK (const Teuchos::RCP<const block_crs_matrix_type>& A_in);

 private:
  RBILUK (const RBILUK<MatrixType> & src);

 public:

  virtual ~RBILUK ();

  void initialize ();

  void compute ();



  // Declare that we intend to overload RILUK::setMatrix, not hide it.
  // This avoids build warnings that the method below "hides
  // overloaded virtual function" (e.g., Clang 3.5).
  //
  // NOTE: If the base class of this class changes, e.g., if its
  // template parameter changes, then be sure to change the code below
  // to refer to the proper base class.
  using RILUK<Tpetra::RowMatrix<typename MatrixType::scalar_type,
                                typename MatrixType::local_ordinal_type,
                                typename MatrixType::global_ordinal_type,
                                typename MatrixType::node_type> >::setMatrix;

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



  std::string description () 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;

public:

  Teuchos::RCP<const block_crs_matrix_type> getBlockMatrix () const;

  const block_crs_matrix_type& getLBlock () const;

  const block_crs_matrix_type& getDBlock () const;

  const block_crs_matrix_type& getUBlock () const;

private:
  typedef Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> MV;
  typedef Teuchos::ScalarTraits<impl_scalar_type> STS;
  typedef Teuchos::ScalarTraits<magnitude_type> STM;
  typedef typename block_crs_matrix_type::little_block_type little_block_type;
  typedef typename block_crs_matrix_type::little_block_host_type little_block_host_type;
  typedef typename block_crs_matrix_type::little_vec_type little_vec_type;
  typedef typename block_crs_matrix_type::little_host_vec_type little_host_vec_type;
  typedef typename block_crs_matrix_type::const_host_little_vec_type const_host_little_vec_type;

  using local_inds_host_view_type = typename block_crs_matrix_type::local_inds_host_view_type;
  using values_host_view_type     = typename block_crs_matrix_type::values_host_view_type;
  using local_inds_device_view_type = typename block_crs_matrix_type::local_inds_device_view_type;
  using values_device_view_type     = typename block_crs_matrix_type::values_device_view_type;

  void allocate_L_and_U_blocks();
  void initAllValues ();

  local_ordinal_type blockSize_;

  Teuchos::RCP<block_crs_matrix_type> L_block_;
  Teuchos::RCP<block_crs_matrix_type> U_block_;
  Teuchos::RCP<block_crs_matrix_type> D_block_;

  Teuchos::RCP<block_crs_matrix_type> D_block_inverse_;

  Kokkos::View<impl_scalar_type*, typename values_device_view_type::device_type> tmp_;
};


} // namepsace Experimental

} // namespace Ifpack2

#endif /* IFPACK2_EXPERIMENTALCRSRBILUK_DECL_HPP */