MueLu_AggregationStructuredAlgorithm_decl.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_AGGREGATIONSTRUCTUREDALGORITHM_DECL_HPP_
#define MUELU_AGGREGATIONSTRUCTUREDALGORITHM_DECL_HPP_

#include "MueLu_ConfigDefs.hpp"
#include "MueLu_AggregationAlgorithmBase.hpp"
#include "MueLu_AggregationStructuredAlgorithm_fwd.hpp"

#include "Xpetra_Vector.hpp"

#include "MueLu_FactoryBase_fwd.hpp"
#include "MueLu_Aggregates_fwd.hpp"
#include "MueLu_IndexManager_fwd.hpp"
#include "MueLu_IndexManager_kokkos_fwd.hpp"
#include "MueLu_LWGraph.hpp"
#include "MueLu_LWGraph_kokkos.hpp"

namespace MueLu {
template <class LocalOrdinal  = DefaultLocalOrdinal,
          class GlobalOrdinal = DefaultGlobalOrdinal,
          class Node          = DefaultNode>
class AggregationStructuredAlgorithm : public MueLu::AggregationAlgorithmBase<LocalOrdinal, GlobalOrdinal, Node> {
#undef MUELU_AGGREGATIONSTRUCTUREDALGORITHM_SHORT
#include "MueLu_UseShortNamesOrdinal.hpp"

 public:
  using local_graph_type       = typename LWGraph_kokkos::local_graph_type;
  using non_const_row_map_type = typename local_graph_type::row_map_type::non_const_type;
  using size_type              = typename local_graph_type::size_type;
  using entries_type           = typename local_graph_type::entries_type;
  using device_type            = typename local_graph_type::device_type;
  using execution_space        = typename local_graph_type::device_type::execution_space;
  using memory_space           = typename local_graph_type::device_type::memory_space;

  using LOVectorView      = decltype(std::declval<LOVector>().getDeviceLocalView(Xpetra::Access::ReadWrite));
  using constIntTupleView = typename Kokkos::View<const int[3], device_type>;
  using constLOTupleView  = typename Kokkos::View<const LO[3], device_type>;


  AggregationStructuredAlgorithm(const RCP<const FactoryBase>& /* graphFact */ = Teuchos::null) {}

  virtual ~AggregationStructuredAlgorithm() {}




  void BuildAggregatesNonKokkos(const Teuchos::ParameterList& params, const LWGraph& graph,
                                Aggregates& aggregates,
                                typename AggregationAlgorithmBase<LocalOrdinal, GlobalOrdinal, Node>::AggStatHostType& aggStat,
                                LO& numNonAggregatedNodes) const;

  void BuildGraphOnHost(const LWGraph& graph, RCP<IndexManager>& geoData, const LO dofsPerNode,
                        RCP<CrsGraph>& myGraph, RCP<const Map>& coarseCoordinatesFineMap,
                        RCP<const Map>& coarseCoordinatesMap) const;

  void BuildAggregates(const Teuchos::ParameterList& params,
                       const LWGraph_kokkos& graph,
                       Aggregates& aggregates,
                       typename AggregationAlgorithmBase<LocalOrdinal, GlobalOrdinal, Node>::AggStatType& aggStat,
                       LO& numNonAggregatedNodes) const;

  void BuildGraph(const LWGraph_kokkos& graph,
                  RCP<IndexManager_kokkos>& geoData,
                  const LO dofsPerNode,
                  RCP<CrsGraph>& myGraph) const;

  std::string description() const { return "Aggretation: structured algorithm"; }

  struct fillAggregatesFunctor {
    IndexManager_kokkos geoData_;
    const int myRank_;
    Kokkos::View<unsigned*, device_type> aggStat_;
    LOVectorView vertex2AggID_;
    LOVectorView procWinner_;

    fillAggregatesFunctor(RCP<IndexManager_kokkos> geoData,
                          const int myRank,
                          Kokkos::View<unsigned*, device_type> aggStat,
                          LOVectorView vertex2AggID,
                          LOVectorView procWinner);

    KOKKOS_INLINE_FUNCTION
    void operator()(const LO nodeIdx, LO& lNumAggregatedNodes) const;

  };  // struct fillAggregatesFunctor

  struct computeGraphDataConstantFunctor {
    IndexManager_kokkos geoData_;
    const int numGhostedNodes_;
    const LO dofsPerNode_;
    constIntTupleView coarseRate_;
    constIntTupleView endRate_;
    constLOTupleView lFineNodesPerDir_;
    non_const_row_map_type rowPtr_;
    entries_type colIndex_;

    computeGraphDataConstantFunctor(RCP<IndexManager_kokkos> geoData,
                                    const LO numGhostedNodes, const LO dofsPerNode,
                                    constIntTupleView coarseRate, constIntTupleView endRate,
                                    constLOTupleView lFineNodesPerDir,
                                    non_const_row_map_type rowPtr, entries_type colIndex);

    KOKKOS_INLINE_FUNCTION
    void operator()(const LO nodeIdx) const;

  };  // struct computeGraphDataConstantFunctor

  struct computeGraphRowPtrFunctor {
    IndexManager_kokkos geoData_;
    const LO dofsPerNode_;
    const int numInterpolationPoints_;
    const LO numLocalRows_;
    constIntTupleView coarseRate_;
    constLOTupleView lFineNodesPerDir_;
    non_const_row_map_type rowPtr_;

    computeGraphRowPtrFunctor(RCP<IndexManager_kokkos> geoData,
                              const LO dofsPerNode,
                              const int numInterpolationPoints, const LO numLocalRows,
                              constIntTupleView coarseRate, constLOTupleView lFineNodesPerDir,
                              non_const_row_map_type rowPtr);

    KOKKOS_INLINE_FUNCTION
    void operator()(const LO rowIdx, GO& update, const bool final) const;
  };  // struct computeGraphRowPtrFunctor

  struct computeGraphDataLinearFunctor {
    IndexManager_kokkos geoData_;
    const int numDimensions_;
    const int numGhostedNodes_;
    const LO dofsPerNode_;
    const int numInterpolationPoints_;
    constIntTupleView coarseRate_;
    constIntTupleView endRate_;
    constLOTupleView lFineNodesPerDir_;
    constLOTupleView ghostedNodesPerDir_;
    non_const_row_map_type rowPtr_;
    entries_type colIndex_;

    computeGraphDataLinearFunctor(RCP<IndexManager_kokkos> geoData,
                                  const int numDimensions,
                                  const LO numGhostedNodes, const LO dofsPerNode,
                                  const int numInterpolationPoints,
                                  constIntTupleView coarseRate, constIntTupleView endRate,
                                  constLOTupleView lFineNodesPerDir,
                                  constLOTupleView ghostedNodesPerDir,
                                  non_const_row_map_type rowPtr, entries_type colIndex);

    KOKKOS_INLINE_FUNCTION
    void operator()(const LO nodeIdx) const;

  };  // struct computeGraphDataLinearFunctor

 private:
  void ComputeGraphDataConstant(const LWGraph& graph, RCP<IndexManager>& geoData,
                                const LO dofsPerNode, const int numInterpolationPoints,
                                ArrayRCP<size_t>& nnzOnRow, Array<size_t>& rowPtr,
                                Array<LO>& colIndex) const;

  void ComputeGraphDataLinear(const LWGraph& graph, RCP<IndexManager>& geoData,
                              const LO dofsPerNode, const int numInterpolationPoints,
                              ArrayRCP<size_t>& nnzOnRow, Array<size_t>& rowPtr,
                              Array<LO>& colIndex) const;
};

}  // namespace MueLu

#define MUELU_AGGREGATIONSTRUCTUREDALGORITHM_SHORT
#endif /* MUELU_AGGREGATIONSTRUCTUREDALGORITHM_DECL_HPP_ */