src/ParaMEDMEM/ParaUMesh.hxx

   1 // Copyright (C) 2020  CEA/DEN, EDF R&D
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  18 //
  19 // Author : Anthony Geay (EDF R&D)
  20
  21 #pragma once
  22
  23 #include "MEDCouplingUMesh.hxx"
  24 #include "ProcessorGroup.hxx"
  25 #include "MEDCouplingMemArray.hxx"
  26
  27 #include <string>
  28 #include <vector>
  29
  30 namespace MEDCoupling
  31 {
  32   /*!
  33    * Parallel representation of an unstructured mesh.
  34    *
  35    * This class is very specific to the requirement of parallel code computations.
  36    */
  37   class ParaUMesh : public RefCountObject
  38   {
  39   public:
  40     static ParaUMesh *New(MEDCouplingUMesh *mesh, DataArrayIdType *globalCellIds, DataArrayIdType *globalNodeIds);
  41     MCAuto<DataArrayIdType> getCellIdsLyingOnNodes(const DataArrayIdType *globalNodeIds, bool fullyIn) const;
  42     ParaUMesh *redistributeCells(const DataArrayIdType *globalCellIds) const;
  43     DataArrayDouble *redistributeCellField(const DataArrayIdType *globalCellIds, const DataArrayDouble *fieldValueToRed) const;
  44     DataArrayIdType *redistributeCellField(const DataArrayIdType *globalCellIds, const DataArrayIdType *fieldValueToRed) const;
  45     DataArrayDouble *redistributeNodeField(const DataArrayIdType *globalCellIds, const DataArrayDouble *fieldValueToRed) const;
  46     DataArrayIdType *redistributeNodeField(const DataArrayIdType *globalCellIds, const DataArrayIdType *fieldValueToRed) const;
  47     MEDCouplingUMesh *getMesh() { return _mesh; }
  48     DataArrayIdType *getGlobalCellIds() { return _cell_global; }
  49     DataArrayIdType *getGlobalNodeIds() { return _node_global; }
  50   protected:
  51     virtual ~ParaUMesh() { }
  52     ParaUMesh(MEDCouplingUMesh *mesh, DataArrayIdType *globalCellIds, DataArrayIdType *globalNodeIds);
  53     std::string getClassName() const override { return "ParaUMesh"; }
  54     std::size_t getHeapMemorySizeWithoutChildren() const override;
  55     std::vector<const BigMemoryObject *> getDirectChildrenWithNull() const override;
  56   private:
  57     MCAuto<MEDCouplingUMesh> _mesh;
  58     MCAuto<DataArrayIdType> _cell_global;
  59     MCAuto<DataArrayIdType> _node_global;
  60   private:
  61     template<class T>
  62     typename Traits<T>::ArrayType *redistributeCellFieldT(const DataArrayIdType *globalCellIds, const typename Traits<T>::ArrayType *fieldValueToRed) const
  63     {
  64       using DataArrayT = typename Traits<T>::ArrayType;
  65       MPI_Comm comm(MPI_COMM_WORLD);
  66       CommInterface ci;
  67       std::unique_ptr<mcIdType[]> allGlobalCellIds,allGlobalCellIdsIndex;
  68       int size(ci.allGatherArrays(comm,globalCellIds,allGlobalCellIds,allGlobalCellIdsIndex));
  69       // Prepare ParaUMesh parts to be sent : compute for each proc the contribution of current rank.
  70       std::vector< MCAuto<DataArrayIdType> > globalCellIdsToBeSent(size);
  71       std::vector< MCAuto<DataArrayT> > fieldToBeSent(size);
  72       for(int curRk = 0 ; curRk < size ; ++curRk)
  73       {
  74         mcIdType offset(allGlobalCellIdsIndex[curRk]);
  75         MCAuto<DataArrayIdType> globalCellIdsOfCurProc(DataArrayIdType::New());
  76         globalCellIdsOfCurProc->useArray(allGlobalCellIds.get()+offset,false,DeallocType::CPP_DEALLOC,allGlobalCellIdsIndex[curRk+1]-offset,1);
  77         // the key call is here : compute for rank curRk the cells to be sent
  78         MCAuto<DataArrayIdType> globalCellIdsCaptured(_cell_global->buildIntersection(globalCellIdsOfCurProc));// OK for the global cellIds
  79         MCAuto<DataArrayIdType> localCellIdsCaptured(_cell_global->findIdForEach(globalCellIdsCaptured->begin(),globalCellIdsCaptured->end()));
  80         globalCellIdsToBeSent[curRk] = globalCellIdsCaptured;
  81         fieldToBeSent[curRk] = fieldValueToRed->selectByTupleIdSafe(localCellIdsCaptured->begin(),localCellIdsCaptured->end());
  82       }
  83       // Receive
  84       std::vector< MCAuto<DataArrayIdType> > globalCellIdsReceived;
  85       ci.allToAllArrays(comm,globalCellIdsToBeSent,globalCellIdsReceived);
  86       std::vector< MCAuto<DataArrayT> > fieldValueReceived;
  87       ci.allToAllArrays(comm,fieldToBeSent,fieldValueReceived);
  88       // use globalCellIdsReceived to reorganize everything
  89       MCAuto<DataArrayIdType> aggregatedCellIds( DataArrayIdType::Aggregate(FromVecAutoToVecOfConst<DataArrayIdType>(globalCellIdsReceived)) );
  90       MCAuto<DataArrayIdType> aggregatedCellIdsSorted(aggregatedCellIds->copySorted());
  91       MCAuto<DataArrayIdType> idsIntoAggregatedIds(DataArrayIdType::FindPermutationFromFirstToSecondDuplicate(aggregatedCellIdsSorted,aggregatedCellIds));
  92       MCAuto<DataArrayIdType> cellIdsOfSameNodeIds(aggregatedCellIdsSorted->indexOfSameConsecutiveValueGroups());
  93       MCAuto<DataArrayIdType> n2o_cells(idsIntoAggregatedIds->selectByTupleIdSafe(cellIdsOfSameNodeIds->begin(),cellIdsOfSameNodeIds->end()-1));//new == new ordering so that global cell ids are sorted . old == coarse ordering implied by the aggregation
  94       //
  95       MCAuto<DataArrayT> fieldAggregated(DataArrayT::Aggregate(FromVecAutoToVecOfConst<DataArrayT>(fieldValueReceived)));
  96       MCAuto<DataArrayT> ret(fieldAggregated->selectByTupleIdSafe(n2o_cells->begin(),n2o_cells->end()));
  97       return ret.retn();
  98     }
  99
 100     template<class T>
 101     typename Traits<T>::ArrayType *redistributeNodeFieldT(const DataArrayIdType *globalCellIds, const typename Traits<T>::ArrayType *fieldValueToRed) const
 102     {
 103       using DataArrayT = typename Traits<T>::ArrayType;
 104       MPI_Comm comm(MPI_COMM_WORLD);
 105       CommInterface ci;
 106       std::unique_ptr<mcIdType[]> allGlobalCellIds,allGlobalCellIdsIndex;
 107       int size(ci.allGatherArrays(comm,globalCellIds,allGlobalCellIds,allGlobalCellIdsIndex));
 108       // Prepare ParaUMesh parts to be sent : compute for each proc the contribution of current rank.
 109       std::vector< MCAuto<DataArrayIdType> > globalNodeIdsToBeSent(size);
 110       std::vector< MCAuto<DataArrayT> > fieldToBeSent(size);
 111       for(int curRk = 0 ; curRk < size ; ++curRk)
 112       {
 113         mcIdType offset(allGlobalCellIdsIndex[curRk]);
 114         MCAuto<DataArrayIdType> globalCellIdsOfCurProc(DataArrayIdType::New());
 115         globalCellIdsOfCurProc->useArray(allGlobalCellIds.get()+offset,false,DeallocType::CPP_DEALLOC,allGlobalCellIdsIndex[curRk+1]-offset,1);
 116         // the key call is here : compute for rank curRk the cells to be sent
 117         MCAuto<DataArrayIdType> globalCellIdsCaptured(_cell_global->buildIntersection(globalCellIdsOfCurProc));// OK for the global cellIds
 118         MCAuto<DataArrayIdType> localCellIdsCaptured(_cell_global->findIdForEach(globalCellIdsCaptured->begin(),globalCellIdsCaptured->end()));
 119         MCAuto<MEDCouplingUMesh> meshPart(_mesh->buildPartOfMySelf(localCellIdsCaptured->begin(),localCellIdsCaptured->end(),true));
 120         MCAuto<DataArrayIdType> o2n(meshPart->zipCoordsTraducer());// OK for the mesh
 121         MCAuto<DataArrayIdType> n2o(o2n->invertArrayO2N2N2O(meshPart->getNumberOfNodes()));
 122         MCAuto<DataArrayIdType> globalNodeIdsPart(_node_global->selectByTupleIdSafe(n2o->begin(),n2o->end())); // OK for the global nodeIds
 123         globalNodeIdsToBeSent[curRk] = globalNodeIdsPart;
 124         fieldToBeSent[curRk] = fieldValueToRed->selectByTupleIdSafe(n2o->begin(),n2o->end());
 125       }
 126       // Receive
 127       std::vector< MCAuto<DataArrayIdType> > globalNodeIdsReceived;
 128       ci.allToAllArrays(comm,globalNodeIdsToBeSent,globalNodeIdsReceived);
 129       std::vector< MCAuto<DataArrayT> > fieldValueReceived;
 130       ci.allToAllArrays(comm,fieldToBeSent,fieldValueReceived);
 131       // firstly deal with nodes.
 132       MCAuto<DataArrayIdType> aggregatedNodeIds( DataArrayIdType::Aggregate(FromVecAutoToVecOfConst<DataArrayIdType>(globalNodeIdsReceived)) );
 133       MCAuto<DataArrayIdType> aggregatedNodeIdsSorted(aggregatedNodeIds->copySorted());
 134       MCAuto<DataArrayIdType> nodeIdsIntoAggregatedIds(DataArrayIdType::FindPermutationFromFirstToSecondDuplicate(aggregatedNodeIdsSorted,aggregatedNodeIds));
 135       MCAuto<DataArrayIdType> idxOfSameNodeIds(aggregatedNodeIdsSorted->indexOfSameConsecutiveValueGroups());
 136       MCAuto<DataArrayIdType> n2o_nodes(nodeIdsIntoAggregatedIds->selectByTupleIdSafe(idxOfSameNodeIds->begin(),idxOfSameNodeIds->end()-1));//new == new ordering so that global node ids are sorted . old == coarse ordering implied by the aggregation
 137       //
 138       MCAuto<DataArrayT> fieldAggregated(DataArrayT::Aggregate(FromVecAutoToVecOfConst<DataArrayT>(fieldValueReceived)));
 139       MCAuto<DataArrayT> ret(fieldAggregated->selectByTupleIdSafe(n2o_nodes->begin(),n2o_nodes->end()));
 140       //
 141       return ret.retn();
 142     }
 143   };
 144 }