Amesos2_KLU2_decl.hpp

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// @HEADER
// *****************************************************************************
//           Amesos2: Templated Direct Sparse Solver Package
//
// Copyright 2011 NTESS and the Amesos2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef AMESOS2_KLU2_DECL_HPP
#define AMESOS2_KLU2_DECL_HPP

#include "Amesos2_SolverTraits.hpp"
#include "Amesos2_SolverCore.hpp"
#include "Amesos2_KLU2_FunctionMap.hpp"


namespace Amesos2 {


template <class Matrix,
          class Vector>
class KLU2 : public SolverCore<Amesos2::KLU2, Matrix, Vector>
{
  friend class SolverCore<Amesos2::KLU2,Matrix,Vector>; // Give our base access
                                                          // to our private
                                                          // implementation funcs
public:

  static const char* name;      // declaration. Initialization outside.

  typedef KLU2<Matrix,Vector>                                       type;
  typedef SolverCore<Amesos2::KLU2,Matrix,Vector>             super_type;

  // Since typedef's are not inheritted, go grab them
  typedef typename VectorTraits<Vector>::scalar_t        vector_scalar_type;
  typedef typename super_type::scalar_type                      scalar_type;
  typedef typename super_type::local_ordinal_type        local_ordinal_type;
  typedef typename super_type::global_ordinal_type      global_ordinal_type;
  typedef typename super_type::global_size_type            global_size_type;

  typedef TypeMap<Amesos2::KLU2,scalar_type>                    type_map;

  /*
   * The KLU2 interface will need two other typedef's, which are:
   * - the KLU2 type that corresponds to scalar_type and
   * - the corresponding type to use for magnitude
   */
  typedef typename type_map::type                                 klu2_type;
  typedef typename type_map::dtype                               klu2_dtype;

  typedef FunctionMap<Amesos2::KLU2,klu2_type>                 function_map;

  typedef Matrix                                                matrix_type;
  typedef MatrixAdapter<matrix_type>                    matrix_adapter_type;



  KLU2(Teuchos::RCP<const Matrix> A,
          Teuchos::RCP<Vector>       X,
          Teuchos::RCP<const Vector> B);


  ~KLU2( );


private:

  bool single_proc_optimization() const;

  int preOrdering_impl();


  int symbolicFactorization_impl();


  int numericFactorization_impl();


  int solve_impl(const Teuchos::Ptr<MultiVecAdapter<Vector> >       X,
                 const Teuchos::Ptr<const MultiVecAdapter<Vector> > B) const;


  bool matrixShapeOK_impl() const;


  void setParameters_impl(
    const Teuchos::RCP<Teuchos::ParameterList> & parameterList );


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


  bool loadA_impl(EPhase current_phase);

  // struct holds all data necessary for KLU2 factorization or solve call
  mutable struct KLU2Data {
      ::KLU2::klu_symbolic<klu2_dtype, local_ordinal_type> *symbolic_;
      ::KLU2::klu_numeric<klu2_dtype, local_ordinal_type> *numeric_;
      ::KLU2::klu_common<klu2_dtype, local_ordinal_type> common_;
  } data_ ;

  typedef Kokkos::DefaultHostExecutionSpace HostSpaceType;
  typedef Kokkos::View<local_ordinal_type*, HostSpaceType> host_ordinal_type_array;

  typedef Kokkos::View<klu2_type*, HostSpaceType>     host_value_type_array;

  // The following Views are persisting storage arrays for A, X, and B
  host_value_type_array host_nzvals_view_;

  host_ordinal_type_array host_rows_view_;
  host_ordinal_type_array host_col_ptr_view_;

  typedef typename Kokkos::View<klu2_type**, Kokkos::LayoutLeft, HostSpaceType>
    host_solve_array_t;

  mutable host_solve_array_t xValues_;

  mutable host_solve_array_t bValues_;

  int transFlag_;

  bool is_contiguous_;
  bool use_gather_;
};                              // End class KLU2


// Specialize solver_traits struct for KLU2
template <>
struct solver_traits<KLU2> {
#ifdef HAVE_TEUCHOS_COMPLEX
  typedef Meta::make_list6<float,
                           double,
                           Kokkos::complex<float>,
                           Kokkos::complex<double>,
                           std::complex<float>,
                           std::complex<double> > supported_scalars;
#else
  typedef Meta::make_list2<float, double> supported_scalars;
#endif
};

template <typename Scalar, typename LocalOrdinal, typename ExecutionSpace>
struct solver_supports_matrix<KLU2,
  KokkosSparse::CrsMatrix<Scalar, LocalOrdinal, ExecutionSpace>> {
  static const bool value = true;
};

} // end namespace Amesos2

#endif  // AMESOS2_KLU2_DECL_HPP