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MueLu_CoupledAggregationCommHelper_decl.hpp
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46 #ifndef MUELU_COUPLEDAGGREGATIONCOMMHELPER_DECL_HPP
47 #define MUELU_COUPLEDAGGREGATIONCOMMHELPER_DECL_HPP
48 
49 #include <Xpetra_Import_fwd.hpp>
51 #include <Xpetra_Vector_fwd.hpp>
53 
54 #include "MueLu_ConfigDefs.hpp"
55 #include "MueLu_BaseClass.hpp"
57 
58 #include "MueLu_Aggregates.hpp"
59 
60 namespace MueLu {
61 
69  template <class LocalOrdinal = int, class GlobalOrdinal = LocalOrdinal, class Node = KokkosClassic::DefaultNode::DefaultNodeType>
71 
72  typedef double Scalar; // Scalar type only used for weight: always a double.
73 #undef MUELU_COUPLEDAGGREGATIONCOMMHELPER_SHORT
74 #include "MueLu_UseShortNames.hpp"
75 
76  public:
77 
79 
80 
82  CoupledAggregationCommHelper(const RCP<const Map> & uniqueMap, const RCP<const Map> & nonUniqueMap);
83 
86 
88 
100  void ArbitrateAndCommunicate(Vector &weights, Aggregates &aggregates, const bool perturb) const {
101  ArbitrateAndCommunicate(weights, *aggregates.GetProcWinner(), &*aggregates.GetVertex2AggId(), perturb);
102  }
103 
162  /*
163  Output:
164  @param weight \f$ weight[k] \Leftarrow \max(weight[k_1],\dots,weight[k_n]) \f$
165  where \f$ weight[k_j] \f$ live on different processors
166  but have the same GlobalId as weight[k] on this processor.
167 
168  @param procWinner procWinner[k] <-- MyPid associated with the
169  kj yielding the max in
170  Max(weight[k1],...,weight[kn]) .
171  See weight Output comments.
172  NOTE: If all input weight[kj]'s are zero,
173  then procWinner[k] is left untouched.
174 
175  @param companion If not null,
176  companion[k] <-- companion[kj] where
177  companion[kj] lives on processor procWinner[k].
178  and corresponds to the same GlobalId as k.
179  NOTE: If for a particlar GlobalId, no processor
180  has a value of procWinner that matches
181  its MyPid, the corresponding companion
182  is not altered.
183  */
184  void ArbitrateAndCommunicate(Vector &weight, LOVector &procWinner, LOMultiVector *companion, const bool perturb) const; //ArbitrateAndCommunicate(Vector&, LOVector &, LOMultiVector *, const bool) const
185 
206  void NonUnique2NonUnique(const Vector &source, Vector &dest, const Xpetra::CombineMode what) const;
207 
208  private:
210  mutable RCP<const Import> winnerImport_; //FIXME get rid of "mutable"
211  mutable RCP<Import> pushWinners_; //FIXME get rid of mutable
217  mutable int numMyWinners_;
219  mutable int numCalls_;
220  int myPID_;
221 
222  // uniqueMap A subset of weight.getMap() where each GlobalId
223  // has only one unique copy on one processor.
224  // Normally, weight.getMap() would have both locals
225  // and ghost elements while uniqueMap would just
226  // have the locals. It should be possible to
227  // remove this or make it an optional argument
228  // and use some existing Epetra/Tpetra capability to
229  // make a uniqueMap.
230  //
231  // import_ This corresponds precisely to
232  // Import import_(
233  // weight.getMap(), uniqueMap);
234  // This could also be eliminated and created
235  // here, but for efficiency user's must pass in.
236  //
237  };
238 
239 
240 }
241 
242 //JG:
243 // - procWinner is an array of proc ID -> LocalOrdinal
244 // - companion == aggregates.GetVertex2AggId() == local aggregate ID -> LocalOrdinal
245 
246 #define MUELU_COUPLEDAGGREGATIONCOMMHELPER_SHORT
247 #endif // MUELU_COUPLEDAGGREGATIONCOMMHELPER_DECL_HPP
const RCP< LOVector > & GetProcWinner() const
Returns constant vector that maps local node IDs to owning processor IDs.
Container class for aggregation information.
void NonUnique2NonUnique(const Vector &source, Vector &dest, const Xpetra::CombineMode what) const
Redistribute data in source to dest where both source and dest might have multiple copies of the same...
void ArbitrateAndCommunicate(Vector &weights, Aggregates &aggregates, const bool perturb) const
This method assigns unknowns to aggregates.
Helper class for providing arbitrated communication across processors.
const RCP< LOMultiVector > & GetVertex2AggId() const
Returns constant vector that maps local node IDs to local aggregates IDs.
Base class for MueLu classes.
CoupledAggregationCommHelper(const RCP< const Map > &uniqueMap, const RCP< const Map > &nonUniqueMap)
Constructor.