petsc_solver.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2004 - 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_petsc_solver_h
#  define dealii_petsc_solver_h


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

#  ifdef DEAL_II_WITH_PETSC

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

#    include <petscksp.h>

#    include <memory>

#    ifdef DEAL_II_WITH_SLEPC
#      include <deal.II/lac/slepc_spectral_transformation.h>
#    endif

DEAL_II_NAMESPACE_OPEN

// Forward declarations
#    ifndef DOXYGEN
#      ifdef DEAL_II_WITH_SLEPC
namespace SLEPcWrappers
{
  // forward declarations
  class TransformationBase;
} // namespace SLEPcWrappers
#      endif
#    endif

namespace PETScWrappers
{
  // forward declarations
#    ifndef DOXYGEN
  class MatrixBase;
  class VectorBase;
  class PreconditionerBase;
#    endif


  class SolverBase
  {
  public:
    SolverBase(SolverControl &cn, const MPI_Comm &mpi_communicator);

    virtual ~SolverBase() = default;

    void
    solve(const MatrixBase &        A,
          VectorBase &              x,
          const VectorBase &        b,
          const PreconditionerBase &preconditioner);


    virtual void
    reset();


    void
    set_prefix(const std::string &prefix);


    SolverControl &
    control() const;

    void
    initialize(const PreconditionerBase &preconditioner);

  protected:
    SolverControl &solver_control;

    const MPI_Comm mpi_communicator;

    virtual void
    set_solver_type(KSP &ksp) const = 0;

    std::string prefix_name;

  private:
    static PetscErrorCode
    convergence_test(KSP                 ksp,
                     const PetscInt      iteration,
                     const PetscReal     residual_norm,
                     KSPConvergedReason *reason,
                     void *              solver_control);

    struct SolverData
    {
      ~SolverData();

      KSP ksp;
    };

    std::unique_ptr<SolverData> solver_data;

#    ifdef DEAL_II_WITH_SLEPC
    // Make the transformation class a friend, since it needs to set the KSP
    // solver.
    friend class SLEPcWrappers::TransformationBase;
#    endif
  };



  class SolverRichardson : public SolverBase
  {
  public:
    struct AdditionalData
    {
      explicit AdditionalData(const double omega = 1);

      double omega;
    };

    SolverRichardson(SolverControl &       cn,
                     const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
                     const AdditionalData &data             = AdditionalData());

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverChebychev : public SolverBase
  {
  public:
    struct AdditionalData
    {};

    SolverChebychev(SolverControl &       cn,
                    const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
                    const AdditionalData &data             = AdditionalData());

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverCG : public SolverBase
  {
  public:
    struct AdditionalData
    {};

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

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverBiCG : public SolverBase
  {
  public:
    struct AdditionalData
    {};

    SolverBiCG(SolverControl &       cn,
               const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
               const AdditionalData &data             = AdditionalData());

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



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

      unsigned int restart_parameter;

      bool right_preconditioning;
    };

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

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverBicgstab : public SolverBase
  {
  public:
    struct AdditionalData
    {};

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

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };

  class SolverCGS : public SolverBase
  {
  public:
    struct AdditionalData
    {};

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

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverTFQMR : public SolverBase
  {
  public:
    struct AdditionalData
    {};

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

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverTCQMR : public SolverBase
  {
  public:
    struct AdditionalData
    {};

    SolverTCQMR(SolverControl &       cn,
                const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
                const AdditionalData &data             = AdditionalData());

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverCR : public SolverBase
  {
  public:
    struct AdditionalData
    {};

    SolverCR(SolverControl &       cn,
             const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
             const AdditionalData &data             = AdditionalData());

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };



  class SolverLSQR : public SolverBase
  {
  public:
    struct AdditionalData
    {};

    SolverLSQR(SolverControl &       cn,
               const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
               const AdditionalData &data             = AdditionalData());

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };


  class SolverPreOnly : public SolverBase
  {
  public:
    struct AdditionalData
    {};

    SolverPreOnly(SolverControl &       cn,
                  const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
                  const AdditionalData &data             = AdditionalData());

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;
  };

  class SparseDirectMUMPS : public SolverBase
  {
  public:
    struct AdditionalData
    {};
    SparseDirectMUMPS(SolverControl &       cn,
                      const MPI_Comm &      mpi_communicator = PETSC_COMM_SELF,
                      const AdditionalData &data = AdditionalData());

    void
    solve(const MatrixBase &A, VectorBase &x, const VectorBase &b);

    void
    set_symmetric_mode(const bool flag);

  protected:
    const AdditionalData additional_data;

    virtual void
    set_solver_type(KSP &ksp) const override;

  private:
    static PetscErrorCode
    convergence_test(KSP                 ksp,
                     const PetscInt      iteration,
                     const PetscReal     residual_norm,
                     KSPConvergedReason *reason,
                     void *              solver_control);

    struct SolverDataMUMPS
    {
      ~SolverDataMUMPS();

      KSP ksp;
      PC  pc;
    };

    std::unique_ptr<SolverDataMUMPS> solver_data;

    bool symmetric_mode;
  };
} // namespace PETScWrappers

DEAL_II_NAMESPACE_CLOSE

#  endif // DEAL_II_WITH_PETSC

/*----------------------------   petsc_solver.h ---------------------------*/

#endif
/*----------------------------   petsc_solver.h ---------------------------*/