MueLu_CreateEpetraPreconditioner.cpp

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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_CREATE_EPETRA_PRECONDITIONER_CPP
#define MUELU_CREATE_EPETRA_PRECONDITIONER_CPP
 
#include <Teuchos_XMLParameterListHelpers.hpp>
#include <Xpetra_CrsMatrix.hpp>
#include <Xpetra_MultiVector.hpp>
#include <Xpetra_MultiVectorFactory.hpp>
 
#include <MueLu.hpp>
 
#include <MueLu_EpetraOperator.hpp>
#include <MueLu_Exceptions.hpp>
#include <MueLu_Hierarchy.hpp>
#include <MueLu_CreateXpetraPreconditioner.hpp>
#include <MueLu_MasterList.hpp>
#include <MueLu_ParameterListInterpreter.hpp>
#include <MueLu_Utilities.hpp>
#include <MueLu_HierarchyUtils.hpp>

#if defined(HAVE_MUELU_EPETRA)
namespace MueLu {

Teuchos::RCP<MueLu::EpetraOperator>
CreateEpetraPreconditioner(const Teuchos::RCP<Epetra_CrsMatrix>& inA,
                           // FIXME: why is it non-const
                           Teuchos::ParameterList& paramListIn) {
  using SC = double;
  using LO = int;
  using GO = int;
  using NO = Xpetra::EpetraNode;
 
  using Teuchos::ParameterList;
 
  using MultiVector      = Xpetra::MultiVector<SC, LO, GO, NO>;
  using Matrix           = Xpetra::Matrix<SC, LO, GO, NO>;
  using Hierarchy        = Hierarchy<SC, LO, GO, NO>;
  using HierarchyManager = HierarchyManager<SC, LO, GO, NO>;
 
  Teuchos::ParameterList& userList = paramListIn.sublist("user data");
  if (userList.isParameter("Coordinates")) {
    RCP<Xpetra::MultiVector<typename Teuchos::ScalarTraits<SC>::coordinateType, LO, GO, NO> > coordinates = Teuchos::null;
    try {
      coordinates = EpetraMultiVector_To_XpetraMultiVector<typename Teuchos::ScalarTraits<SC>::coordinateType, LO, GO, NO>(userList.get<RCP<Epetra_MultiVector> >("Coordinates"));
    } catch (Teuchos::Exceptions::InvalidParameterType&) {
      coordinates = userList.get<RCP<Xpetra::MultiVector<typename Teuchos::ScalarTraits<SC>::coordinateType, LO, GO, NO> > >("Coordinates");
    }
    if (Teuchos::nonnull(coordinates)) {
      userList.set<RCP<Xpetra::MultiVector<typename Teuchos::ScalarTraits<SC>::coordinateType, LO, GO, NO> > >("Coordinates", coordinates);
    }
  }
  if (userList.isParameter("Nullspace")) {
    RCP<Xpetra::MultiVector<typename Teuchos::ScalarTraits<SC>::coordinateType, LO, GO, NO> > nullspace = Teuchos::null;
    try {
      nullspace = EpetraMultiVector_To_XpetraMultiVector<SC, LO, GO, NO>(userList.get<RCP<Epetra_MultiVector> >("Nullspace"));
    } catch (Teuchos::Exceptions::InvalidParameterType&) {
      nullspace = userList.get<RCP<Xpetra::MultiVector<SC, LO, GO, NO> > >("Nullspace");
    }
    if (Teuchos::nonnull(nullspace)) {
      userList.set<RCP<Xpetra::MultiVector<typename Teuchos::ScalarTraits<SC>::coordinateType, LO, GO, NO> > >("Nullspace", nullspace);
    }
  }
 
  RCP<Matrix> A    = EpetraCrs_To_XpetraMatrix<SC, LO, GO, NO>(inA);
  RCP<Hierarchy> H = MueLu::CreateXpetraPreconditioner<SC, LO, GO, NO>(A, paramListIn);
  return rcp(new EpetraOperator(H));
}

Teuchos::RCP<MueLu::EpetraOperator>
CreateEpetraPreconditioner(const Teuchos::RCP<Epetra_CrsMatrix>& A,
                           const std::string& xmlFileName) {
  Teuchos::ParameterList paramList;
  Teuchos::updateParametersFromXmlFileAndBroadcast(xmlFileName, Teuchos::Ptr<Teuchos::ParameterList>(&paramList), *Xpetra::toXpetra(A->Comm()));
 
  return CreateEpetraPreconditioner(A, paramList);
}

Teuchos::RCP<MueLu::EpetraOperator>
CreateEpetraPreconditioner(const Teuchos::RCP<Epetra_CrsMatrix>& A) {
  Teuchos::ParameterList paramList;
  return CreateEpetraPreconditioner(A, paramList);
}
 
void ReuseEpetraPreconditioner(const Teuchos::RCP<Epetra_CrsMatrix>& inA, MueLu::EpetraOperator& Op) {
  using SC = double;
  using LO = int;
  using GO = int;
  using NO = Xpetra::EpetraNode;
 
  using Teuchos::ParameterList;
 
  using Matrix    = Xpetra::Matrix<SC, LO, GO, NO>;
  using Hierarchy = Hierarchy<SC, LO, GO, NO>;
 
  RCP<Hierarchy> H = Op.GetHierarchy();
  RCP<Matrix> A    = EpetraCrs_To_XpetraMatrix<SC, LO, GO, NO>(inA);
 
  MueLu::ReuseXpetraPreconditioner<SC, LO, GO, NO>(A, H);
}
 
}  // namespace MueLu
#endif  // HAVE_MUELU_SERIAL and HAVE_MUELU_EPETRA
 
#endif  // ifndef MUELU_CREATE_EPETRA_PRECONDITIONER_CPP