MueLu_LWGraph_kokkos_decl.hpp

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#ifndef MUELU_LWGRAPH_KOKKOS_DECL_HPP
#define MUELU_LWGRAPH_KOKKOS_DECL_HPP

#include "MueLu_ConfigDefs.hpp"
#ifdef HAVE_MUELU_KOKKOS_REFACTOR

#include <Kokkos_StaticCrsGraph.hpp>
#include <KokkosCompat_ClassicNodeAPI_Wrapper.hpp>

#include <Xpetra_ConfigDefs.hpp>   // global_size_t
#include <Xpetra_Map.hpp>

#include "MueLu_LWGraph_kokkos_fwd.hpp"

#include "MueLu_Exceptions.hpp"

namespace MueLu {

  template<class LocalOrdinal, class GlobalOrdinal, class Node>
  class LWGraph_kokkos;

  // Partial specialization for DeviceType
  template<class LocalOrdinal, class GlobalOrdinal, class DeviceType>
  class LWGraph_kokkos<LocalOrdinal, GlobalOrdinal, Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>> {
  public:
    using local_ordinal_type  = LocalOrdinal;
    using global_ordinal_type = GlobalOrdinal;
    using execution_space     = typename DeviceType::execution_space;
    using memory_space        = typename DeviceType::memory_space;
    using device_type         = Kokkos::Device<execution_space, memory_space>;
    using range_type          = Kokkos::RangePolicy<local_ordinal_type, execution_space>;
    using node_type           = Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>;
    using size_type           = size_t;

    using map_type            = Xpetra::Map<LocalOrdinal, GlobalOrdinal, node_type>;
    using local_graph_type    = Kokkos::StaticCrsGraph<LocalOrdinal,
                                                       Kokkos::LayoutLeft,
                                                       device_type>;
    using boundary_nodes_type = Kokkos::View<const bool*, memory_space>;
    using row_type            = Kokkos::View<const LocalOrdinal*, memory_space>;

  private:
    // For compatibility
    typedef node_type                                           Node;
#undef MUELU_LWGRAPH_KOKKOS_SHORT
#include "MueLu_UseShortNamesOrdinal.hpp"

  public:



    //
    // @param[in] graph: local graph of type Kokkos::CsrStaticGraph containing CSR data
    // @param[in] domainMap: non-overlapping (domain) map for graph. Usually provided by AmalgamationFactory stored in UnAmalgamationInfo container
    // @param[in] importMap: overlapping map for graph. Usually provided by AmalgamationFactory stored in UnAmalgamationInfo container
    // @param[in] objectLabel: label string
    LWGraph_kokkos(const local_graph_type&    graph,
                   const RCP<const map_type>& domainMap,
                   const RCP<const map_type>& importMap,
                   const std::string&         objectLabel = "");

    ~LWGraph_kokkos() { }

    const RCP<const Teuchos::Comm<int> > GetComm() const {
      return domainMap_->getComm();
    }
    const RCP<const Map> GetDomainMap() const {
      return domainMap_;
    }
    const RCP<const Map> GetImportMap() const {
      return importMap_;
    }

    KOKKOS_INLINE_FUNCTION size_type GetNodeNumVertices() const {
      return graph_.numRows();
    }
    KOKKOS_INLINE_FUNCTION size_type GetNodeNumEdges() const {
      return graph_.row_map(GetNodeNumVertices());
    }

    KOKKOS_INLINE_FUNCTION size_type getNodeMaxNumRowEntries () const {
      return maxNumRowEntries_;
    }

    KOKKOS_INLINE_FUNCTION typename local_graph_type::row_map_type getRowPtrs() const {
      return graph_.row_map;
    }

    KOKKOS_INLINE_FUNCTION typename local_graph_type::entries_type getEntries() const {
      return graph_.entries;
    }

    // Unfortunately, C++11 does not support the following:
    //    auto getNeighborVertices(LO i) const -> decltype(rowView)
    // auto return with decltype was only introduced in C++14
    KOKKOS_INLINE_FUNCTION
    Kokkos::GraphRowViewConst<local_graph_type> getNeighborVertices(LO i) const {
      auto rowView = graph_.rowConst(i);

      return rowView;
    }

    KOKKOS_INLINE_FUNCTION bool isLocalNeighborVertex(LO i) const {
      return i >= minLocalIndex_ && i <= maxLocalIndex_;
    }

    KOKKOS_INLINE_FUNCTION void SetBoundaryNodeMap(const boundary_nodes_type bndry) {
      dirichletBoundaries_ = bndry;
    }

    KOKKOS_INLINE_FUNCTION const boundary_nodes_type GetBoundaryNodeMap() const {
      return dirichletBoundaries_;
    }

    std::string description() const {
      return "LWGraph (" + objectLabel_ + ")";
    }

    // void print(Teuchos::FancyOStream &out, const VerbLevel verbLevel = Default) const;

  private:

    const local_graph_type      graph_;

    const RCP<const map_type>   domainMap_;
    const RCP<const map_type>   importMap_;

    boundary_nodes_type         dirichletBoundaries_;

    LO        minLocalIndex_, maxLocalIndex_;
    size_type maxNumRowEntries_;

    const std::string& objectLabel_;
  };

}

#define MUELU_LWGRAPH_KOKKOS_SHORT
#endif // HAVE_MUELU_KOKKOS_REFACTOR
#endif // MUELU_LWGRAPH_KOKKOS_DECL_HPP