ginkgo_solver.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2018 - 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_ginkgo_solver_h
#  define dealii_ginkgo_solver_h
 
 
#  include <deal.II/base/config.h>
 
#  ifdef DEAL_II_WITH_GINKGO
 
#    include <deal.II/lac/block_sparse_matrix.h>
#    include <deal.II/lac/exceptions.h>
#    include <deal.II/lac/solver_control.h>
#    include <deal.II/lac/sparse_matrix.h>
#    include <deal.II/lac/vector.h>
 
#    include <ginkgo/ginkgo.hpp>
 
#    include <memory>
 
DEAL_II_NAMESPACE_OPEN
 
namespace GinkgoWrappers
{
  template <typename ValueType, typename IndexType>
  class SolverBase
  {
  public:
    SolverBase(SolverControl &solver_control, const std::string &exec_type);
 
    virtual ~SolverBase() = default;
 
    void
    initialize(const SparseMatrix<ValueType> &matrix);
 
    void
    apply(Vector<ValueType> &solution, const Vector<ValueType> &rhs);
 
    void
    solve(const SparseMatrix<ValueType> &matrix,
          Vector<ValueType> &            solution,
          const Vector<ValueType> &      rhs);
 
    SolverControl &
    control() const;
 
 
  protected:
    SolverControl &solver_control;
 
    std::shared_ptr<gko::LinOpFactory> solver_gen;
 
    std::shared_ptr<gko::stop::ResidualNormReduction<>::Factory>
      residual_criterion;
 
    std::shared_ptr<gko::log::Convergence<>> convergence_logger;
 
    std::shared_ptr<gko::stop::Combined::Factory> combined_factory;
 
    std::shared_ptr<gko::Executor> executor;
 
  private:
    void
    initialize_ginkgo_log();
 
    std::shared_ptr<gko::matrix::Csr<ValueType, IndexType>> system_matrix;
 
    const std::string exec_type;
  };
 
 
  template <typename ValueType = double, typename IndexType = int32_t>
  class SolverCG : public SolverBase<ValueType, IndexType>
  {
  public:
    struct AdditionalData
    {};
 
    SolverCG(SolverControl &       solver_control,
             const std::string &   exec_type,
             const AdditionalData &data = AdditionalData());
 
    SolverCG(SolverControl &                           solver_control,
             const std::string &                       exec_type,
             const std::shared_ptr<gko::LinOpFactory> &preconditioner,
             const AdditionalData &                    data = AdditionalData());
 
  protected:
    const AdditionalData additional_data;
  };
 
 
  template <typename ValueType = double, typename IndexType = int32_t>
  class SolverBicgstab : public SolverBase<ValueType, IndexType>
  {
  public:
    struct AdditionalData
    {};
 
    SolverBicgstab(SolverControl &       solver_control,
                   const std::string &   exec_type,
                   const AdditionalData &data = AdditionalData());
 
    SolverBicgstab(SolverControl &                           solver_control,
                   const std::string &                       exec_type,
                   const std::shared_ptr<gko::LinOpFactory> &preconditioner,
                   const AdditionalData &data = AdditionalData());
 
  protected:
    const AdditionalData additional_data;
  };
 
  template <typename ValueType = double, typename IndexType = int32_t>
  class SolverCGS : public SolverBase<ValueType, IndexType>
  {
  public:
    struct AdditionalData
    {};
 
    SolverCGS(SolverControl &       solver_control,
              const std::string &   exec_type,
              const AdditionalData &data = AdditionalData());
 
    SolverCGS(SolverControl &                           solver_control,
              const std::string &                       exec_type,
              const std::shared_ptr<gko::LinOpFactory> &preconditioner,
              const AdditionalData &data = AdditionalData());
 
  protected:
    const AdditionalData additional_data;
  };
 
  template <typename ValueType = double, typename IndexType = int32_t>
  class SolverFCG : public SolverBase<ValueType, IndexType>
  {
  public:
    struct AdditionalData
    {};
 
    SolverFCG(SolverControl &       solver_control,
              const std::string &   exec_type,
              const AdditionalData &data = AdditionalData());
 
    SolverFCG(SolverControl &                           solver_control,
              const std::string &                       exec_type,
              const std::shared_ptr<gko::LinOpFactory> &preconditioner,
              const AdditionalData &data = AdditionalData());
 
  protected:
    const AdditionalData additional_data;
  };
 
  template <typename ValueType = double, typename IndexType = int32_t>
  class SolverGMRES : public SolverBase<ValueType, IndexType>
  {
  public:
    struct AdditionalData
    {
      AdditionalData(const unsigned int restart_parameter = 30);
 
      unsigned int restart_parameter;
    };
 
    SolverGMRES(SolverControl &       solver_control,
                const std::string &   exec_type,
                const AdditionalData &data = AdditionalData());
 
    SolverGMRES(SolverControl &                           solver_control,
                const std::string &                       exec_type,
                const std::shared_ptr<gko::LinOpFactory> &preconditioner,
                const AdditionalData &data = AdditionalData());
 
  protected:
    const AdditionalData additional_data;
  };
 
  template <typename ValueType = double, typename IndexType = int32_t>
  class SolverIR : public SolverBase<ValueType, IndexType>
  {
  public:
    struct AdditionalData
    {};
 
    SolverIR(SolverControl &       solver_control,
             const std::string &   exec_type,
             const AdditionalData &data = AdditionalData());
 
    SolverIR(SolverControl &                           solver_control,
             const std::string &                       exec_type,
             const std::shared_ptr<gko::LinOpFactory> &inner_solver,
             const AdditionalData &                    data = AdditionalData());
 
  protected:
    const AdditionalData additional_data;
  };
 
 
} // namespace GinkgoWrappers
 
DEAL_II_NAMESPACE_CLOSE
 
#  endif // DEAL_II_WITH_GINKGO
 
#endif
/*----------------------------   ginkgo_solver.h ---------------------------*/