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MueLu_LocalLWGraph_kokkos_def.hpp
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5// MueLu: A package for multigrid based preconditioning
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46#ifndef MUELU_LOCALLWGRAPH_KOKKOS_DEF_HPP
47#define MUELU_LOCALLWGRAPH_KOKKOS_DEF_HPP
48
49#include <Kokkos_Core.hpp>
50
51#include <Teuchos_ArrayView.hpp>
52
54
55namespace 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>
89 LocalLWGraph_kokkos(const local_graph_type& graph,
90 const RCP<const map_type>& domainMap)
91 : graph_(graph)
92 {
93 minLocalIndex_ = domainMap->getMinLocalIndex();
94 maxLocalIndex_ = domainMap->getMaxLocalIndex();
95
96 MaxNumRowEntriesFunctor<LO,typename local_graph_type::row_map_type> maxNumRowEntriesFunctor(graph_.row_map);
97 Kokkos::parallel_reduce("MueLu:LocalLWGraph:LWGraph:maxnonzeros", range_type(0,graph_.numRows()), maxNumRowEntriesFunctor, maxNumRowEntries_);
98 }
99
100} //namespace MueLu
101
102#endif // MUELU_LWGRAPH_KOKKOS_DEF_HPP
MueLu::DefaultLocalOrdinal LocalOrdinal
Kokkos::StaticCrsGraph< LocalOrdinal, Kokkos::LayoutLeft, device_type, void, size_t > local_graph_type
Lightweight MueLu representation of a compressed row storage graph.
Namespace for MueLu classes and methods.