MueLu_LWGraph_kokkos_def.hpp

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#ifndef MUELU_LWGRAPH_KOKKOS_DEF_HPP
#define MUELU_LWGRAPH_KOKKOS_DEF_HPP
 
#include <Kokkos_Core.hpp>
 
#include <Teuchos_ArrayView.hpp>
 
#include "MueLu_LWGraph_kokkos_decl.hpp"
 
namespace MueLu {
 
  namespace { // anonymous
 
    template<class LocalOrdinal, class RowType>
    class MaxNumRowEntriesFunctor {
    public:
      MaxNumRowEntriesFunctor(RowType rowPointers) : rowPointers_(rowPointers) { }
 
      KOKKOS_INLINE_FUNCTION
      void operator()(const LocalOrdinal i, size_t& maxLength) const {
        size_t d = rowPointers_(i+1) - rowPointers_(i);
 
        maxLength = (d > maxLength ? d : maxLength);
      }
 
      KOKKOS_INLINE_FUNCTION
      void join(volatile size_t& dest, const volatile size_t& src) {
        dest = (dest > src ? dest : src);
      }
 
      KOKKOS_INLINE_FUNCTION
      void init(size_t& initValue) {
        initValue = 0;
      }
 
    private:
      RowType rowPointers_;
    };
 
  }
 
  template<class LocalOrdinal, class GlobalOrdinal, class DeviceType>
  LWGraph_kokkos<LocalOrdinal,GlobalOrdinal,Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>>::
  LWGraph_kokkos(const local_graph_type&    graph,
                 const RCP<const map_type>& domainMap,
                 const RCP<const map_type>& importMap,
                 const std::string&         objectLabel)
    : graph_(graph), domainMap_(domainMap), importMap_(importMap), objectLabel_(objectLabel)
  {
    minLocalIndex_ = domainMap_->getMinLocalIndex();
    maxLocalIndex_ = domainMap_->getMaxLocalIndex();
 
    MaxNumRowEntriesFunctor<LO,typename local_graph_type::row_map_type> maxNumRowEntriesFunctor(graph_.row_map);
    Kokkos::parallel_reduce("MueLu:LWGraph:LWGraph:maxnonzeros", range_type(0,graph_.numRows()), maxNumRowEntriesFunctor, maxNumRowEntries_);
  }
 
  template<class LocalOrdinal, class GlobalOrdinal, class DeviceType>
  void LWGraph_kokkos<LocalOrdinal,GlobalOrdinal,Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>>::
  print(Teuchos::FancyOStream &out, const VerbLevel verbLevel) const {
 
    if (verbLevel & Debug) {
      RCP<const Map> col_map = importMap_.is_null() ? domainMap_ : importMap_;
      int mypid = col_map->getComm()->getRank();
 
      {
      std::ostringstream ss;
      ss << "[pid " << mypid << "] num entries=" << graph_.entries.size();
      out << ss.str() << std::endl;
      }
 
      const size_t numRows = graph_.numRows();
      auto rowPtrs = graph_.row_map;
      auto columns = graph_.entries;
      for (size_t i=0; i < numRows; ++i) {
        std::ostringstream ss;
        ss << "[pid " << mypid << "] row " << domainMap_->getGlobalElement(i) << ":";
        ss << " (numEntries=" << rowPtrs(i+1)-rowPtrs(i) << ")";
 
        auto rowView = graph_.rowConst(i);
        for (LO j = 0; j < rowView.length; j++) {
          ss << " " << col_map->getGlobalElement(rowView.colidx(j));
        }
        out << ss.str() << std::endl;
      }
    }
  }
 
} //namespace MueLu
 
#endif // MUELU_LWGRAPH_KOKKOS_DEF_HPP