trilinos_solver.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2008 - 2019 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------

#ifndef dealii_trilinos_solver_h
#  define dealii_trilinos_solver_h


#  include <deal.II/base/config.h>

#  ifdef DEAL_II_WITH_TRILINOS

#    include <deal.II/lac/exceptions.h>
#    include <deal.II/lac/la_parallel_vector.h>
#    include <deal.II/lac/solver_control.h>
#    include <deal.II/lac/vector.h>

#    include <Amesos.h>
#    include <AztecOO.h>
#    include <Epetra_LinearProblem.h>
#    include <Epetra_Operator.h>

#    include <memory>


DEAL_II_NAMESPACE_OPEN

namespace TrilinosWrappers
{
  // forward declarations
#    ifndef DOXYGEN
  class SparseMatrix;
  class PreconditionBase;
#    endif


  class SolverBase
  {
  public:
    enum SolverName
    {
      cg,
      cgs,
      gmres,
      bicgstab,
      tfqmr
    } solver_name;

    struct AdditionalData
    {
      explicit AdditionalData(const bool         output_solver_details = false,
                              const unsigned int gmres_restart_parameter = 30);

      const bool output_solver_details;

      const unsigned int gmres_restart_parameter;
    };

    SolverBase(SolverControl &       cn,
               const AdditionalData &data = AdditionalData());

    SolverBase(const enum SolverName solver_name,
               SolverControl &       cn,
               const AdditionalData &data = AdditionalData());

    virtual ~SolverBase() = default;

    void
    solve(const SparseMatrix &    A,
          MPI::Vector &           x,
          const MPI::Vector &     b,
          const PreconditionBase &preconditioner);

    void
    solve(const Epetra_Operator & A,
          MPI::Vector &           x,
          const MPI::Vector &     b,
          const PreconditionBase &preconditioner);

    void
    solve(const Epetra_Operator &A,
          MPI::Vector &          x,
          const MPI::Vector &    b,
          const Epetra_Operator &preconditioner);

    void
    solve(const Epetra_Operator &   A,
          Epetra_MultiVector &      x,
          const Epetra_MultiVector &b,
          const PreconditionBase &  preconditioner);

    void
    solve(const Epetra_Operator &   A,
          Epetra_MultiVector &      x,
          const Epetra_MultiVector &b,
          const Epetra_Operator &   preconditioner);



    void
    solve(const SparseMatrix &          A,
          ::Vector<double> &      x,
          const ::Vector<double> &b,
          const PreconditionBase &      preconditioner);

    void
    solve(Epetra_Operator &             A,
          ::Vector<double> &      x,
          const ::Vector<double> &b,
          const PreconditionBase &      preconditioner);

    void
    solve(const SparseMatrix &                                      A,
          ::LinearAlgebra::distributed::Vector<double> &      x,
          const ::LinearAlgebra::distributed::Vector<double> &b,
          const PreconditionBase &preconditioner);

    void
    solve(Epetra_Operator &                                         A,
          ::LinearAlgebra::distributed::Vector<double> &      x,
          const ::LinearAlgebra::distributed::Vector<double> &b,
          const PreconditionBase &preconditioner);


    SolverControl &
    control() const;

    DeclException1(ExcTrilinosError,
                   int,
                   << "An error with error number " << arg1
                   << " occurred while calling a Trilinos function");

  protected:
    SolverControl &solver_control;

  private:
    template <typename Preconditioner>
    void
    do_solve(const Preconditioner &preconditioner);

    template <typename Preconditioner>
    void
    set_preconditioner(AztecOO &solver, const Preconditioner &preconditioner);

    std::unique_ptr<Epetra_LinearProblem> linear_problem;

    std::unique_ptr<AztecOO_StatusTest> status_test;

    AztecOO solver;

    const AdditionalData additional_data;
  };


  // provide a declaration for two explicit specializations
  template <>
  void
  SolverBase::set_preconditioner(AztecOO &               solver,
                                 const PreconditionBase &preconditioner);

  template <>
  void
  SolverBase::set_preconditioner(AztecOO &              solver,
                                 const Epetra_Operator &preconditioner);



  class SolverCG : public SolverBase
  {
  public:
    struct AdditionalData : public SolverBase::AdditionalData
    {
      explicit AdditionalData(const bool output_solver_details = false);
    };

    SolverCG(SolverControl &cn, const AdditionalData &data = AdditionalData());

  protected:
    const AdditionalData additional_data;
  };



  class SolverCGS : public SolverBase
  {
  public:
    struct AdditionalData : public SolverBase::AdditionalData
    {
      explicit AdditionalData(const bool output_solver_details = false);
    };

    SolverCGS(SolverControl &cn, const AdditionalData &data = AdditionalData());

  protected:
    const AdditionalData additional_data;
  };



  class SolverGMRES : public SolverBase
  {
  public:
    struct AdditionalData : public SolverBase::AdditionalData
    {
      explicit AdditionalData(const bool         output_solver_details = false,
                              const unsigned int restart_parameter     = 30);
    };

    SolverGMRES(SolverControl &       cn,
                const AdditionalData &data = AdditionalData());

  protected:
    const AdditionalData additional_data;
  };



  class SolverBicgstab : public SolverBase
  {
  public:
    struct AdditionalData : public SolverBase::AdditionalData
    {
      explicit AdditionalData(const bool output_solver_details = false);
    };

    SolverBicgstab(SolverControl &       cn,
                   const AdditionalData &data = AdditionalData());

  protected:
    const AdditionalData additional_data;
  };



  class SolverTFQMR : public SolverBase
  {
  public:
    struct AdditionalData : public SolverBase::AdditionalData
    {
      explicit AdditionalData(const bool output_solver_details = false);
    };

    SolverTFQMR(SolverControl &       cn,
                const AdditionalData &data = AdditionalData());

  protected:
    const AdditionalData additional_data;
  };



  class SolverDirect
  {
  public:
    struct AdditionalData
    {
      explicit AdditionalData(const bool         output_solver_details = false,
                              const std::string &solver_type = "Amesos_Klu");

      bool output_solver_details;

      std::string solver_type;
    };

    SolverDirect(SolverControl &       cn,
                 const AdditionalData &data = AdditionalData());

    virtual ~SolverDirect() = default;

    void
    initialize(const SparseMatrix &A);

    void
    solve(MPI::Vector &x, const MPI::Vector &b);

    void
    solve(::LinearAlgebra::distributed::Vector<double> &      x,
          const ::LinearAlgebra::distributed::Vector<double> &b);

    void
    solve(const SparseMatrix &A, MPI::Vector &x, const MPI::Vector &b);

    void
    solve(const SparseMatrix &          A,
          ::Vector<double> &      x,
          const ::Vector<double> &b);

    void
    solve(const SparseMatrix &                                      A,
          ::LinearAlgebra::distributed::Vector<double> &      x,
          const ::LinearAlgebra::distributed::Vector<double> &b);

    SolverControl &
    control() const;

    DeclException1(ExcTrilinosError,
                   int,
                   << "An error with error number " << arg1
                   << " occurred while calling a Trilinos function");

  private:
    void
    do_solve();

    SolverControl &solver_control;

    std::unique_ptr<Epetra_LinearProblem> linear_problem;

    std::unique_ptr<Amesos_BaseSolver> solver;

    const AdditionalData additional_data;
  };

} // namespace TrilinosWrappers

DEAL_II_NAMESPACE_CLOSE

#  endif // DEAL_II_WITH_TRILINOS

/*----------------------------   trilinos_solver.h ---------------------------*/

#endif
/*----------------------------   trilinos_solver.h ---------------------------*/