MueLu_InitialBlockNumberFactory_def.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_INITIALBLOCKNUMBER_FACTORY_DEF_HPP
#define MUELU_INITIALBLOCKNUMBER_FACTORY_DEF_HPP

#include "Xpetra_VectorFactory.hpp"
#include "Xpetra_Map.hpp"
#include "Xpetra_Matrix.hpp"
#include "Xpetra_IO.hpp"

#include "MueLu_InitialBlockNumberFactory_decl.hpp"

#include "MueLu_MasterList.hpp"
#include "MueLu_Level.hpp"
#include "MueLu_Monitor.hpp"

namespace MueLu {

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
RCP<const ParameterList> InitialBlockNumberFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::GetValidParameterList() const {
  RCP<ParameterList> validParamList = rcp(new ParameterList());
#define SET_VALID_ENTRY(name) validParamList->setEntry(name, MasterList::getEntry(name))
  SET_VALID_ENTRY("aggregation: block diagonal: interleaved blocksize");
#undef SET_VALID_ENTRY

  validParamList->set<RCP<const FactoryBase> >("A", Teuchos::null, "Generating factory of the matrix A");

  return validParamList;
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void InitialBlockNumberFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level& currentLevel) const {
  Input(currentLevel, "A");
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void InitialBlockNumberFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Build(Level& currentLevel) const {
  FactoryMonitor m(*this, "Build", currentLevel);
  const ParameterList& pL = GetParameterList();

  RCP<Matrix> A = Get<RCP<Matrix> >(currentLevel, "A");
  LO blocksize  = as<LO>(pL.get<int>("aggregation: block diagonal: interleaved blocksize"));

  GetOStream(Statistics1) << "Generating interleaved blocking with " << blocksize << " equations" << std::endl;
  RCP<LocalOrdinalVector> BlockNumber = LocalOrdinalVectorFactory::Build(A->getRowMap(), false);
  Teuchos::ArrayRCP<LO> bn_data       = BlockNumber->getDataNonConst(0);
  for (LO i = 0; i < (LO)A->getRowMap()->getLocalNumElements(); i++)
    bn_data[i] = i % blocksize;

  Set(currentLevel, "BlockNumber", BlockNumber);
}

}  // namespace MueLu

#endif  // MUELU_INITIALBLOCKNUMBER_FACTORY_DEF_HPP