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MueLu_LWGraph_kokkos_def.hpp
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46 #ifndef MUELU_LWGRAPH_KOKKOS_DEF_HPP
47 #define MUELU_LWGRAPH_KOKKOS_DEF_HPP
48 
49 #include <Kokkos_Core.hpp>
50 
51 #include <Teuchos_ArrayView.hpp>
52 
54 
55 namespace MueLu {
56 
57  namespace { // anonymous
58 
59  template<class LocalOrdinal, class RowType>
60  class MaxNumRowEntriesFunctor {
61  public:
62  MaxNumRowEntriesFunctor(RowType rowPointers) : rowPointers_(rowPointers) { }
63 
64  KOKKOS_INLINE_FUNCTION
65  void operator()(const LocalOrdinal i, size_t& maxLength) const {
66  size_t d = rowPointers_(i+1) - rowPointers_(i);
67 
68  maxLength = (d > maxLength ? d : maxLength);
69  }
70 
71  KOKKOS_INLINE_FUNCTION
72  void join(volatile size_t& dest, const volatile size_t& src) {
73  dest = (dest > src ? dest : src);
74  }
75 
76  KOKKOS_INLINE_FUNCTION
77  void init(size_t& initValue) {
78  initValue = 0;
79  }
80 
81  private:
82  RowType rowPointers_;
83  };
84 
85  }
86 
87  template<class LocalOrdinal, class GlobalOrdinal, class DeviceType>
88  LWGraph_kokkos<LocalOrdinal,GlobalOrdinal,Kokkos::Compat::KokkosDeviceWrapperNode<DeviceType>>::
89  LWGraph_kokkos(const local_graph_type& graph,
90  const RCP<const map_type>& domainMap,
91  const RCP<const map_type>& importMap,
92  const std::string& objectLabel)
93  : graph_(graph), domainMap_(domainMap), importMap_(importMap), objectLabel_(objectLabel)
94  {
95  minLocalIndex_ = domainMap_->getMinLocalIndex();
96  maxLocalIndex_ = domainMap_->getMaxLocalIndex();
97 
98  MaxNumRowEntriesFunctor<LO,typename local_graph_type::row_map_type> maxNumRowEntriesFunctor(graph_.row_map);
99  Kokkos::parallel_reduce("MueLu:LWGraph:LWGraph:maxnonzeros", range_type(0,graph_.numRows()), maxNumRowEntriesFunctor, maxNumRowEntries_);
100  }
101 
102 }
103 
104 #endif // MUELU_LWGRAPH_KOKKOS_DEF_HPP
RowType rowPointers_
void parallel_reduce(const std::string &label, const PolicyType &policy, const FunctorType &functor, ReturnType &return_value, typename Impl::enable_if< Kokkos::Impl::is_execution_policy< PolicyType >::value >::type *=0)