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MueLu_InterfaceAggregationAlgorithm_def.hpp
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46/*
47 * MueLu_OnePtAggregationAlgorithm_def.hpp
48 *
49 * Created on: Sep 18, 2012
50 * Author: Tobias Wiesner
51 */
52
53#ifndef MUELU_INTERFACEAGGREGATIONALGORITHM_DEF_HPP_
54#define MUELU_INTERFACEAGGREGATIONALGORITHM_DEF_HPP_
55
56#include <Teuchos_Comm.hpp>
57#include <Teuchos_CommHelpers.hpp>
58
59#include <Xpetra_Vector.hpp>
60
61#include "MueLu_InterfaceAggregationAlgorithm.hpp"
62
63//#include "MueLu_Graph.hpp"
64#include "MueLu_GraphBase.hpp"
65#include "MueLu_Aggregates.hpp"
66#include "MueLu_Exceptions.hpp"
67#include "MueLu_Monitor.hpp"
68
69namespace MueLu {
70
71template <class LocalOrdinal, class GlobalOrdinal, class Node>
75
76template <class LocalOrdinal, class GlobalOrdinal, class Node>
77void InterfaceAggregationAlgorithm<LocalOrdinal, GlobalOrdinal, Node>::BuildAggregates(Teuchos::ParameterList const & /* params */, GraphBase const & graph, Aggregates & aggregates, std::vector<unsigned>& aggStat, LO& numNonAggregatedNodes) const {
78 Monitor m(*this, "BuildAggregates");
79
80 const LocalOrdinal nRows = graph.GetNodeNumVertices();
81 const int myRank = graph.GetComm()->getRank();
82
83 // vertex ids for output
84 Teuchos::ArrayRCP<LocalOrdinal> vertex2AggId = aggregates.GetVertex2AggId()->getDataNonConst(0);
85 Teuchos::ArrayRCP<LocalOrdinal> procWinner = aggregates.GetProcWinner()->getDataNonConst(0);
86
87 // some internal variables
88 LocalOrdinal numLocalAggregates = aggregates.GetNumAggregates(); // number of local aggregates on current proc
89
90 // main loop over all local rows of graph(A)
91 for(int iNode1 = 0; iNode1 < nRows; ++iNode1) {
92
93 if (aggStat[iNode1] == INTERFACE) {
94
95 aggregates.SetIsRoot(iNode1); // mark iNode1 as root node for new aggregate 'agg'
96 int aggIndex = numLocalAggregates;
97 std::vector<int> aggList;
98 aggList.push_back(iNode1);
99 ArrayView<const LO> neighOfINode = graph.getNeighborVertices(iNode1);
100
101 for(int j = 0; j < neighOfINode.size(); ++j) {
102 LO neigh = neighOfINode[j];
103 if(neigh != iNode1 && graph.isLocalNeighborVertex(neigh)) {
104 if(aggStat[neigh] != AGGREGATED && aggStat[neigh] != INTERFACE &&
105 aggStat[neigh] != IGNORED) {
106 aggList.push_back(neigh);
107 }
108 }
109 }
110
111 for (size_t k = 0; k < aggList.size(); k++) {
112 aggStat[aggList[k]] = AGGREGATED;
113 vertex2AggId[aggList[k]] = aggIndex;
114 procWinner[aggList[k]] = myRank;
115 }
116 ++numLocalAggregates;
117 numNonAggregatedNodes -= aggList.size();
118 }
119
120 } // end for
121
122 // update aggregate object
123 aggregates.SetNumAggregates(numLocalAggregates);
124}
125
126} // end namespace
127
128
129#endif /* MUELU_INTERFACEAGGREGATIONALGORITHM_DEF_HPP_ */
MueLu::DefaultLocalOrdinal LocalOrdinal
Container class for aggregation information.
void SetIsRoot(LO i, bool value=true)
Set root node information.
const RCP< LOMultiVector > & GetVertex2AggId() const
Returns constant vector that maps local node IDs to local aggregates IDs.
const RCP< LOVector > & GetProcWinner() const
Returns constant vector that maps local node IDs to owning processor IDs.
LO GetNumAggregates() const
returns the number of aggregates of the current processor. Note: could/should be renamed to GetNumLoc...
void SetNumAggregates(LO nAggregates)
Set number of local aggregates on current processor.
MueLu representation of a graph.
virtual const RCP< const Teuchos::Comm< int > > GetComm() const =0
virtual bool isLocalNeighborVertex(LocalOrdinal v) const =0
Return true if vertex with local id 'v' is on current process.
virtual Teuchos::ArrayView< const LocalOrdinal > getNeighborVertices(LocalOrdinal v) const =0
Return the list of vertices adjacent to the vertex 'v'.
virtual size_t GetNodeNumVertices() const =0
Return number of vertices owned by the calling node.
void BuildAggregates(Teuchos::ParameterList const &params, GraphBase const &graph, Aggregates &aggregates, std::vector< unsigned > &aggStat, LO &numNonAggregatedNodes) const
Local aggregation.
InterfaceAggregationAlgorithm(RCP< const FactoryBase > const &graphFact=Teuchos::null)
Constructor.
Timer to be used in non-factories.
Namespace for MueLu classes and methods.