MueLu_IfpackSmoother.hpp

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// @HEADER
// *****************************************************************************
//        MueLu: A package for multigrid based preconditioning
//
// Copyright 2012 NTESS and the MueLu contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef MUELU_IFPACKSMOOTHER_HPP
#define MUELU_IFPACKSMOOTHER_HPP

#include "MueLu_ConfigDefs.hpp"
#if defined(HAVE_MUELU_EPETRA) && defined(HAVE_MUELU_IFPACK)

#include <Teuchos_ParameterList.hpp>
#include <Xpetra_Matrix.hpp>
#include <Xpetra_MultiVectorFactory_fwd.hpp>

class Ifpack_Preconditioner;

#include "MueLu_SmootherPrototype.hpp"
#include "MueLu_Exceptions.hpp"

#include "MueLu_Level_fwd.hpp"
#include "MueLu_FactoryBase_fwd.hpp"
#include "MueLu_Utilities_fwd.hpp"
#include "MueLu_Aggregates_fwd.hpp"

namespace MueLu {

template <class Node = typename SmootherPrototype<double, int, int>::node_type>
class IfpackSmoother : public MueLu::SmootherPrototype<double, int, int, Node> {
  typedef double Scalar;
  typedef int LocalOrdinal;
  typedef int GlobalOrdinal;
#undef MUELU_IFPACKSMOOTHER_SHORT
#include "MueLu_UseShortNames.hpp"

 public:


  IfpackSmoother(std::string const& type, Teuchos::ParameterList const& paramList = Teuchos::ParameterList(), LO const& overlap = 0);  // TODO: empty paramList valid for Ifpack??

  virtual ~IfpackSmoother() {}


  void SetParameterList(const Teuchos::ParameterList& paramList);



  void DeclareInput(Level& currentLevel) const;




  void Setup(Level& currentLevel);

  void Apply(MultiVector& X, const MultiVector& B, bool InitialGuessIsZero = false) const;




  RCP<SmootherPrototype> Copy() const;




  std::string description() const;

  // using MueLu::Describable::describe; // overloading, not hiding
  // void describe(Teuchos::FancyOStream &out, const VerbLevel verbLevel = Default) const
  void print(Teuchos::FancyOStream& out, const VerbLevel verbLevel = Default) const;

  size_t getNodeSmootherComplexity() const;


 private:
  void SetPrecParameters(const Teuchos::ParameterList& list = Teuchos::ParameterList()) const;

  void SetupAggregate(Level& currentLevel);

 private:
  std::string type_;

  LO overlap_;

  RCP<Matrix> A_;

  // Note: prec_ must be destroyed before A_, so declaration of prec_ appears after declaration of A_
  RCP<Ifpack_Preconditioner> prec_;

};  // class IfpackSmoother

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
RCP<MueLu::SmootherPrototype<Scalar, LocalOrdinal, GlobalOrdinal, Node> >
GetIfpackSmoother(const std::string& /* type */                 = "",
                  const Teuchos::ParameterList& /* paramList */ = Teuchos::ParameterList(),
                  const LocalOrdinal& /* overlap */             = 0) {
  TEUCHOS_TEST_FOR_EXCEPTION(true, Exceptions::RuntimeError, "IfpackSmoother cannot be used with Scalar != double, LocalOrdinal != int, GlobalOrdinal != int");
  TEUCHOS_UNREACHABLE_RETURN(Teuchos::null);
}

// Specialization for serial node (used for Epetra)
#if defined(HAVE_MUELU_EPETRA)
template <>
inline RCP<MueLu::SmootherPrototype<double, int, int, Xpetra::EpetraNode> >
GetIfpackSmoother<double, int, int, Xpetra::EpetraNode>(const std::string& type, const Teuchos::ParameterList& paramList, const int& overlap) {
  return rcp(new MueLu::IfpackSmoother<Xpetra::EpetraNode>(type, paramList, overlap));
}
#endif

}  // namespace MueLu

#define MUELU_IFPACKSMOOTHER_SHORT
#endif  // HAVE_MUELU_EPETRA && HAVE_MUELU_IFPACK
#endif  // MUELU_IFPACKSMOOTHER_HPP