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MueLu_IsolatedNodeAggregationAlgorithm_kokkos_def.hpp
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46#ifndef MUELU_ISOLATEDNODEAGGREGATIONALGORITHM_KOKKOS_DEF_HPP
47#define MUELU_ISOLATEDNODEAGGREGATIONALGORITHM_KOKKOS_DEF_HPP
48
49#include <Teuchos_Comm.hpp>
50#include <Teuchos_CommHelpers.hpp>
51
52#include <Xpetra_Vector.hpp>
53
54#include "MueLu_IsolatedNodeAggregationAlgorithm_kokkos.hpp"
55
56#include "MueLu_LWGraph_kokkos.hpp"
57#include "MueLu_Aggregates_kokkos.hpp"
58#include "MueLu_Exceptions.hpp"
59#include "MueLu_Monitor.hpp"
60
61namespace MueLu {
62
63 template <class LocalOrdinal, class GlobalOrdinal, class Node>
65 BuildAggregates(const ParameterList& /* params */,
66 const LWGraph_kokkos& graph,
67 Aggregates_kokkos& /* aggregates */,
68 Kokkos::View<unsigned*, typename LWGraph_kokkos::device_type>& aggstat,
69 LO& numNonAggregatedNodes) const {
70 Monitor m(*this, "BuildAggregates");
71
72 typename Kokkos::View<unsigned*, device_type>::HostMirror aggstatHost
73 = Kokkos::create_mirror(aggstat);
74 Kokkos::deep_copy(aggstatHost, aggstat);
75 std::vector<unsigned> aggStat;
76 aggStat.resize(aggstatHost.extent(0));
77 for(size_t idx = 0; idx < aggstatHost.extent(0); ++idx) {
78 aggStat[idx] = aggstatHost(idx);
79 }
80
81 auto lclLWGraph = graph.getLocalLWGraph();
82
83 const LO numRows = graph.GetNodeNumVertices();
84
85 // Remove all isolated nodes
86 for (LO i = 0; i < numRows; i++)
87 if (aggStat[i] != AGGREGATED && aggStat[i] != IGNORED && lclLWGraph.getNeighborVertices(i).length == 1) {
88 aggStat[i] = IGNORED;
89 numNonAggregatedNodes--;
90 }
91
92 for(size_t idx = 0; idx < aggstatHost.extent(0); ++idx) {
93 aggstatHost(idx) = aggStat[idx];
94 }
95 Kokkos::deep_copy(aggstat, aggstatHost);
96 }
97
98} // end namespace
99
100#endif // MUELU_ISOLATEDNODEAGGREGATIONALGORITHM_KOKKOS_DEF_HPP
void BuildAggregates(const ParameterList &params, const LWGraph_kokkos &graph, Aggregates_kokkos &aggregates, Kokkos::View< unsigned *, device_type > &aggStat, LO &numNonAggregatedNodes) const
Local aggregation.
Lightweight MueLu representation of a compressed row storage graph.
Timer to be used in non-factories.
Namespace for MueLu classes and methods.
@ AGGREGATED
Definition: MueLu_Types.hpp:73