src/ParaMEDMEM/ParaUMesh.cxx

   1 //
   2 // Copyright (C) 2020-2021  CEA/DEN, EDF R&D
   3 //
   4 // This library is free software; you can redistribute it and/or
   5 // modify it under the terms of the GNU Lesser General Public
   6 // License as published by the Free Software Foundation; either
   7 // version 2.1 of the License, or (at your option) any later version.
   8 //
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 // Lesser General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU Lesser General Public
  15 // License along with this library; if not, write to the Free Software
  16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17 //
  18 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  19 //
  20 // Author : Anthony Geay (EDF R&D)
  21
  22 #include "ParaUMesh.hxx"
  23 #include "ProcessorGroup.hxx"
  24 #include "MPIProcessorGroup.hxx"
  25 #include "Topology.hxx"
  26 #include "BlockTopology.hxx"
  27 #include "CommInterface.hxx"
  28 #include "MEDCouplingMemArray.hxx"
  29
  30 #include "mpi.h"
  31
  32 #include <fstream>
  33 #include <sstream>
  34 #include <numeric>
  35 #include <memory>
  36 #include <vector>
  37
  38 using namespace MEDCoupling;
  39
  40 ParaUMesh *ParaUMesh::New(MEDCouplingUMesh *mesh, DataArrayIdType *globalCellIds, DataArrayIdType *globalNodeIds)
  41 {
  42   return new ParaUMesh(mesh,globalCellIds,globalNodeIds);
  43 }
  44
  45 ParaUMesh::ParaUMesh(MEDCouplingUMesh *mesh, DataArrayIdType *globalCellIds, DataArrayIdType *globalNodeIds)
  46 {
  47   _mesh.takeRef(mesh);
  48   _cell_global.takeRef(globalCellIds);
  49   _node_global.takeRef(globalNodeIds);
  50   _mesh.checkNotNull();
  51   _cell_global.checkNotNull();
  52   _node_global.checkNotNull();
  53   _mesh->checkConsistencyLight();
  54   if(_mesh->getNumberOfNodes() != _node_global->getNumberOfTuples())
  55     throw INTERP_KERNEL::Exception("ParaUMesh constructor : mismatch between # nodes and len of global # nodes.");
  56   if(_mesh->getNumberOfCells() != _cell_global->getNumberOfTuples())
  57     throw INTERP_KERNEL::Exception("ParaUMesh constructor : mismatch between # cells and len of global # cells.");
  58 }
  59
  60 std::size_t ParaUMesh::getHeapMemorySizeWithoutChildren() const
  61 {
  62   return 0;
  63 }
  64
  65 std::vector<const BigMemoryObject *> ParaUMesh::getDirectChildrenWithNull() const
  66 {
  67   return {_mesh,_cell_global,_node_global};
  68 }
  69
  70 /*!
  71 * This method computes the cells part of distributed mesh lying on \a globalNodeIds nodes.
  72 * The input \a globalNodeIds are not supposed to reside on the current process.
  73 */
  74 MCAuto<DataArrayIdType> ParaUMesh::getCellIdsLyingOnNodes(const DataArrayIdType *globalNodeIds, bool fullyIn) const
  75 {
  76   if(fullyIn)
  77     return this->getCellIdsLyingOnNodesTrue(globalNodeIds);
  78   else
  79     return this->getCellIdsLyingOnNodesFalse(globalNodeIds);
  80 }
  81
  82 MCAuto<DataArrayIdType> ParaUMesh::getCellIdsLyingOnNodesTrue(const DataArrayIdType *globalNodeIds) const
  83 {
  84   MPI_Comm comm(MPI_COMM_WORLD);
  85   CommInterface ci;
  86   int size;
  87   ci.commSize(comm,&size);
  88   std::unique_ptr<mcIdType[]> nbOfElems(new mcIdType[size]),nbOfElems2(new mcIdType[size]),nbOfElems3(new mcIdType[size]);
  89   mcIdType nbOfNodeIdsLoc(globalNodeIds->getNumberOfTuples());
  90   ci.allGather(&nbOfNodeIdsLoc,1,MPI_ID_TYPE,nbOfElems.get(),1,MPI_ID_TYPE,comm);
  91   std::vector< MCAuto<DataArrayIdType> > tabs(size);
  92   //store for each proc the local nodeids intercepted by current proc
  93   int nbOfCollectiveCalls = 1;// this parameter controls the memory peak
  94   // loop to avoid to all procs to have all the nodes per proc
  95   for(int subDiv = 0 ; subDiv < nbOfCollectiveCalls ; ++subDiv)
  96   {
  97     std::unique_ptr<mcIdType[]> nbOfElemsSp(CommInterface::SplitArrayOfLength(nbOfElems,size,subDiv,nbOfCollectiveCalls));
  98     mcIdType nbOfNodeIdsSum(std::accumulate(nbOfElemsSp.get(),nbOfElemsSp.get()+size,0));
  99     std::unique_ptr<mcIdType[]> allGlobalNodeIds(new mcIdType[nbOfNodeIdsSum]);
 100     std::unique_ptr<int[]> nbOfElemsInt( CommInterface::ToIntArray<mcIdType>(nbOfElemsSp,size) );
 101     std::unique_ptr<int[]> offsetsIn( CommInterface::ComputeOffset(nbOfElemsInt,size) );
 102     mcIdType startGlobalNodeIds,endGlobalNodeIds;
 103     DataArray::GetSlice(0,globalNodeIds->getNumberOfTuples(),1,subDiv,nbOfCollectiveCalls,startGlobalNodeIds,endGlobalNodeIds);
 104     ci.allGatherV(globalNodeIds->begin()+startGlobalNodeIds,FromIdType<int>(endGlobalNodeIds-startGlobalNodeIds),MPI_ID_TYPE,allGlobalNodeIds.get(),nbOfElemsInt.get(),offsetsIn.get(),MPI_ID_TYPE,comm);
 105     mcIdType offset(0);
 106     for(int curRk = 0 ; curRk < size ; ++curRk)
 107     {
 108       MCAuto<DataArrayIdType> globalNodeIdsOfCurProc(DataArrayIdType::New());
 109       globalNodeIdsOfCurProc->useArray(allGlobalNodeIds.get()+offset,false,DeallocType::CPP_DEALLOC,nbOfElemsSp[curRk],1);
 110       offset += nbOfElemsSp[curRk];
 111       MCAuto<DataArrayIdType> globalNodeIdsCaptured(_node_global->buildIntersection(globalNodeIdsOfCurProc));
 112       MCAuto<DataArrayIdType> localNodeIdsToLocate(_node_global->findIdForEach(globalNodeIdsCaptured->begin(),globalNodeIdsCaptured->end()));
 113       if(tabs[curRk].isNull())
 114         tabs[curRk] = localNodeIdsToLocate;
 115       else
 116         tabs[curRk]->insertAtTheEnd(localNodeIdsToLocate->begin(),localNodeIdsToLocate->end());
 117     }
 118   }
 119
 120   for(int curRk = 0 ; curRk < size ; ++curRk)
 121   {
 122     MCAuto<DataArrayIdType> localNodeIds(tabs[curRk]);
 123     localNodeIds->sort();
 124     MCAuto<DataArrayIdType> localNodeIdsUnique(localNodeIds->buildUnique());
 125     MCAuto<DataArrayIdType> localCellCaptured(_mesh->getCellIdsLyingOnNodes(localNodeIdsUnique->begin(),localNodeIdsUnique->end(),true));
 126     MCAuto<DataArrayIdType> localCellCapturedGlob(_cell_global->selectByTupleIdSafe(localCellCaptured->begin(),localCellCaptured->end()));
 127     tabs[curRk] = localCellCapturedGlob;
 128   }
 129
 130   for(int curRk = 0 ; curRk < size ; ++curRk)
 131   {
 132     tabs[curRk] = tabs[curRk]->buildUniqueNotSorted();
 133     nbOfElems3[curRk] = tabs[curRk]->getNumberOfTuples();
 134   }
 135   std::vector<const DataArrayIdType *> tabss(tabs.begin(),tabs.end());
 136   MCAuto<DataArrayIdType> cells(DataArrayIdType::Aggregate(tabss));
 137   ci.allToAll(nbOfElems3.get(),1,MPI_ID_TYPE,nbOfElems2.get(),1,MPI_ID_TYPE,comm);
 138   mcIdType nbOfCellIdsSum(std::accumulate(nbOfElems2.get(),nbOfElems2.get()+size,0));
 139   MCAuto<DataArrayIdType> cellIdsFromProcs(DataArrayIdType::New());
 140   cellIdsFromProcs->alloc(nbOfCellIdsSum,1);
 141   {
 142     std::unique_ptr<int[]> nbOfElemsInt( CommInterface::ToIntArray<mcIdType>(nbOfElems3,size) ),nbOfElemsOutInt( CommInterface::ToIntArray<mcIdType>(nbOfElems2,size) );
 143     std::unique_ptr<int[]> offsetsIn( CommInterface::ComputeOffset(nbOfElemsInt,size) ), offsetsOut( CommInterface::ComputeOffset(nbOfElemsOutInt,size) );
 144     ci.allToAllV(cells->begin(),nbOfElemsInt.get(),offsetsIn.get(),MPI_ID_TYPE,
 145                  cellIdsFromProcs->getPointer(),nbOfElemsOutInt.get(),offsetsOut.get(),MPI_ID_TYPE,comm);
 146   }
 147   cellIdsFromProcs->sort();
 148   return cellIdsFromProcs;
 149 }
 150
 151 MCAuto<DataArrayIdType> ParaUMesh::getCellIdsLyingOnNodesFalse(const DataArrayIdType *globalNodeIds) const
 152 {
 153   MPI_Comm comm(MPI_COMM_WORLD);
 154   CommInterface ci;
 155   int size;
 156   ci.commSize(comm,&size);
 157   std::unique_ptr<mcIdType[]> nbOfElems(new mcIdType[size]),nbOfElems2(new mcIdType[size]),nbOfElems3(new mcIdType[size]);
 158   mcIdType nbOfNodeIdsLoc(globalNodeIds->getNumberOfTuples());
 159   ci.allGather(&nbOfNodeIdsLoc,1,MPI_ID_TYPE,nbOfElems.get(),1,MPI_ID_TYPE,comm);
 160   // loop to avoid to all procs to have all the nodes per proc
 161   int nbOfCollectiveCalls = 1;// this parameter controls the memory peak
 162   std::vector< MCAuto<DataArrayIdType> > tabs(size);
 163   for(int subDiv = 0 ; subDiv < nbOfCollectiveCalls ; ++subDiv)
 164   {
 165     std::unique_ptr<mcIdType[]> nbOfElemsSp(CommInterface::SplitArrayOfLength(nbOfElems,size,subDiv,nbOfCollectiveCalls));
 166     mcIdType nbOfNodeIdsSum(std::accumulate(nbOfElemsSp.get(),nbOfElemsSp.get()+size,0));
 167     std::unique_ptr<mcIdType[]> allGlobalNodeIds(new mcIdType[nbOfNodeIdsSum]);
 168     std::unique_ptr<int[]> nbOfElemsInt( CommInterface::ToIntArray<mcIdType>(nbOfElemsSp,size) );
 169     std::unique_ptr<int[]> offsetsIn( CommInterface::ComputeOffset(nbOfElemsInt,size) );
 170     mcIdType startGlobalNodeIds,endGlobalNodeIds;
 171     DataArray::GetSlice(0,globalNodeIds->getNumberOfTuples(),1,subDiv,nbOfCollectiveCalls,startGlobalNodeIds,endGlobalNodeIds);
 172     ci.allGatherV(globalNodeIds->begin()+startGlobalNodeIds,FromIdType<int>(endGlobalNodeIds-startGlobalNodeIds),MPI_ID_TYPE,allGlobalNodeIds.get(),nbOfElemsInt.get(),offsetsIn.get(),MPI_ID_TYPE,comm);
 173     mcIdType offset(0);
 174     for(int curRk = 0 ; curRk < size ; ++curRk)
 175     {
 176       MCAuto<DataArrayIdType> globalNodeIdsOfCurProc(DataArrayIdType::New());
 177       globalNodeIdsOfCurProc->useArray(allGlobalNodeIds.get()+offset,false,DeallocType::CPP_DEALLOC,nbOfElemsSp[curRk],1);
 178       offset += nbOfElemsSp[curRk];
 179       MCAuto<DataArrayIdType> globalNodeIdsCaptured(_node_global->buildIntersection(globalNodeIdsOfCurProc));
 180       MCAuto<DataArrayIdType> localNodeIdsToLocate(_node_global->findIdForEach(globalNodeIdsCaptured->begin(),globalNodeIdsCaptured->end()));
 181       MCAuto<DataArrayIdType> localCellCaptured(_mesh->getCellIdsLyingOnNodes(localNodeIdsToLocate->begin(),localNodeIdsToLocate->end(),false));
 182       MCAuto<DataArrayIdType> localCellCapturedGlob(_cell_global->selectByTupleIdSafe(localCellCaptured->begin(),localCellCaptured->end()));
 183       if(tabs[curRk].isNull())
 184         tabs[curRk] = localCellCapturedGlob;
 185       else
 186         tabs[curRk]->insertAtTheEnd(localCellCapturedGlob->begin(),localCellCapturedGlob->end());
 187     }
 188   }
 189   for(int curRk = 0 ; curRk < size ; ++curRk)
 190   {
 191     tabs[curRk] = tabs[curRk]->buildUniqueNotSorted();
 192     nbOfElems3[curRk] = tabs[curRk]->getNumberOfTuples();
 193   }
 194   std::vector<const DataArrayIdType *> tabss(tabs.begin(),tabs.end());
 195   MCAuto<DataArrayIdType> cells(DataArrayIdType::Aggregate(tabss));
 196   ci.allToAll(nbOfElems3.get(),1,MPI_ID_TYPE,nbOfElems2.get(),1,MPI_ID_TYPE,comm);
 197   mcIdType nbOfCellIdsSum(std::accumulate(nbOfElems2.get(),nbOfElems2.get()+size,0));
 198   MCAuto<DataArrayIdType> cellIdsFromProcs(DataArrayIdType::New());
 199   cellIdsFromProcs->alloc(nbOfCellIdsSum,1);
 200   {
 201     std::unique_ptr<int[]> nbOfElemsInt( CommInterface::ToIntArray<mcIdType>(nbOfElems3,size) ),nbOfElemsOutInt( CommInterface::ToIntArray<mcIdType>(nbOfElems2,size) );
 202     std::unique_ptr<int[]> offsetsIn( CommInterface::ComputeOffset(nbOfElemsInt,size) ), offsetsOut( CommInterface::ComputeOffset(nbOfElemsOutInt,size) );
 203     ci.allToAllV(cells->begin(),nbOfElemsInt.get(),offsetsIn.get(),MPI_ID_TYPE,
 204                  cellIdsFromProcs->getPointer(),nbOfElemsOutInt.get(),offsetsOut.get(),MPI_ID_TYPE,comm);
 205   }
 206   cellIdsFromProcs->sort();
 207   return cellIdsFromProcs;
 208 }
 209
 210 DataArrayIdType *ParaUMesh::redistributeCellField(const DataArrayIdType *globalCellIds, const DataArrayIdType *fieldValueToRed) const
 211 {
 212   return this->redistributeCellFieldT<mcIdType>(globalCellIds,fieldValueToRed);
 213 }
 214
 215 DataArrayDouble *ParaUMesh::redistributeCellField(const DataArrayIdType *globalCellIds, const DataArrayDouble *fieldValueToRed) const
 216 {
 217   return this->redistributeCellFieldT<double>(globalCellIds,fieldValueToRed);
 218 }
 219
 220 DataArrayIdType *ParaUMesh::redistributeNodeField(const DataArrayIdType *globalCellIds, const DataArrayIdType *fieldValueToRed) const
 221 {
 222   return this->redistributeNodeFieldT<mcIdType>(globalCellIds,fieldValueToRed);
 223 }
 224
 225 DataArrayDouble *ParaUMesh::redistributeNodeField(const DataArrayIdType *globalCellIds, const DataArrayDouble *fieldValueToRed) const
 226 {
 227   return this->redistributeNodeFieldT<double>(globalCellIds,fieldValueToRed);
 228 }
 229
 230 /*!
 231  * Return part of \a this mesh split over COMM_WORLD. Part is defined by global cell ids array \a globaCellIds.
 232  */
 233 ParaUMesh *ParaUMesh::redistributeCells(const DataArrayIdType *globalCellIds) const
 234 {
 235   MPI_Comm comm(MPI_COMM_WORLD);
 236   CommInterface ci;
 237   std::unique_ptr<mcIdType[]> allGlobalCellIds,allGlobalCellIdsIndex;
 238   int size(ci.allGatherArrays(comm,globalCellIds,allGlobalCellIds,allGlobalCellIdsIndex));
 239   // Prepare ParaUMesh parts to be sent : compute for each proc the contribution of current rank.
 240   std::vector< MCAuto<DataArrayIdType> > globalCellIdsToBeSent(size),globalNodeIdsToBeSent(size);
 241   std::vector< MCAuto<MEDCouplingUMesh> > meshPartsToBeSent(size);
 242   for(int curRk = 0 ; curRk < size ; ++curRk)
 243   {
 244     mcIdType offset(allGlobalCellIdsIndex[curRk]);
 245     MCAuto<DataArrayIdType> globalCellIdsOfCurProc(DataArrayIdType::New());
 246     globalCellIdsOfCurProc->useArray(allGlobalCellIds.get()+offset,false,DeallocType::CPP_DEALLOC,allGlobalCellIdsIndex[curRk+1]-offset,1);
 247     // the key call is here : compute for rank curRk the cells to be sent
 248     MCAuto<DataArrayIdType> globalCellIdsCaptured(_cell_global->buildIntersection(globalCellIdsOfCurProc));// OK for the global cellIds
 249     MCAuto<DataArrayIdType> localCellIdsCaptured(_cell_global->findIdForEach(globalCellIdsCaptured->begin(),globalCellIdsCaptured->end()));
 250     MCAuto<MEDCouplingUMesh> meshPart(_mesh->buildPartOfMySelf(localCellIdsCaptured->begin(),localCellIdsCaptured->end(),true));
 251     MCAuto<DataArrayIdType> o2n(meshPart->zipCoordsTraducer());// OK for the mesh
 252     MCAuto<DataArrayIdType> n2o(o2n->invertArrayO2N2N2O(meshPart->getNumberOfNodes()));
 253     MCAuto<DataArrayIdType> globalNodeIdsPart(_node_global->selectByTupleIdSafe(n2o->begin(),n2o->end())); // OK for the global nodeIds
 254     meshPartsToBeSent[curRk] = meshPart;
 255     globalCellIdsToBeSent[curRk] = globalCellIdsCaptured;
 256     globalNodeIdsToBeSent[curRk] = globalNodeIdsPart;
 257   }
 258   // Receive
 259   std::vector< MCAuto<DataArrayIdType> > globalCellIdsReceived,globalNodeIdsReceived;
 260   ci.allToAllArrays(comm,globalCellIdsToBeSent,globalCellIdsReceived);
 261   ci.allToAllArrays(comm,globalNodeIdsToBeSent,globalNodeIdsReceived);
 262   //now exchange the 3 arrays for the umesh : connectivity, connectivityindex and coordinates
 263   std::vector<const MEDCouplingUMesh *> meshPartsToBeSent2(FromVecAutoToVecOfConst<MEDCouplingUMesh>(meshPartsToBeSent));
 264   //connectivityindex
 265   std::vector< MCAuto<DataArrayIdType> > connectivityIndexReceived,connectivityReceived;
 266   {
 267     std::vector<const DataArrayIdType *> connectivityIndexToBeSent(UMeshConnectivityIndexIterator(0,&meshPartsToBeSent2),UMeshConnectivityIndexIterator(meshPartsToBeSent2.size(),&meshPartsToBeSent2));
 268     ci.allToAllArrays(comm,FromVecConstToVecAuto<DataArrayIdType>(connectivityIndexToBeSent),connectivityIndexReceived);
 269   }
 270   //connectivity
 271   {
 272     std::vector<const DataArrayIdType *> connectivityToBeSent(UMeshConnectivityIterator(0,&meshPartsToBeSent2),UMeshConnectivityIterator(meshPartsToBeSent2.size(),&meshPartsToBeSent2));
 273     ci.allToAllArrays(comm,FromVecConstToVecAuto<DataArrayIdType>(connectivityToBeSent),connectivityReceived);
 274   }
 275   //coordinates
 276   MCAuto<DataArrayDouble> coords;
 277   {
 278     std::vector<const DataArrayDouble *> coordsToBeSent(UMeshCoordsIterator(0,&meshPartsToBeSent2),UMeshCoordsIterator(meshPartsToBeSent2.size(),&meshPartsToBeSent2));
 279     ci.allToAllArrays(comm,FromVecConstToVecAuto<DataArrayDouble>(coordsToBeSent),coords);
 280   }
 281   /////// Sort it all !
 282   // firstly deal with nodes.
 283   MCAuto<DataArrayIdType> aggregatedNodeIds( DataArrayIdType::Aggregate(FromVecAutoToVecOfConst<DataArrayIdType>(globalNodeIdsReceived)) );
 284   MCAuto<DataArrayIdType> aggregatedNodeIdsSorted(aggregatedNodeIds->copySorted());
 285   MCAuto<DataArrayIdType> nodeIdsIntoAggregatedIds(DataArrayIdType::FindPermutationFromFirstToSecondDuplicate(aggregatedNodeIdsSorted,aggregatedNodeIds));
 286   MCAuto<DataArrayIdType> idxOfSameNodeIds(aggregatedNodeIdsSorted->indexOfSameConsecutiveValueGroups());
 287   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
 288   MCAuto<DataArrayIdType> finalGlobalNodeIds(aggregatedNodeIdsSorted->selectByTupleIdSafe(idxOfSameNodeIds->begin(),idxOfSameNodeIds->end()-1));
 289   MCAuto<DataArrayDouble> finalCoords(coords->selectByTupleIdSafe(n2o_nodes->begin(),n2o_nodes->end()));
 290   finalCoords->copyStringInfoFrom(*_mesh->getCoords());
 291   // secondly renumbering of node ids in connectivityReceived
 292   for(int curRk = 0 ; curRk < size ; ++curRk)
 293   {
 294     auto current(globalNodeIdsReceived[curRk]);
 295     MCAuto<DataArrayIdType> aa(finalGlobalNodeIds->findIdForEach(current->begin(),current->end()));
 296     // work on connectivityReceived[curRk] with transformWithIndArr but do not forget type of cells that should be excluded !
 297     auto connectivityToModify(connectivityReceived[curRk]);
 298     auto connectivityIndex(connectivityIndexReceived[curRk]);
 299     MCAuto<DataArrayIdType> types(connectivityToModify->selectByTupleIdSafe(connectivityIndex->begin(),connectivityIndex->end()-1));
 300     connectivityToModify->setPartOfValuesSimple3(0,connectivityIndex->begin(),connectivityIndex->end()-1,0,1,1);
 301     connectivityToModify->transformWithIndArr(aa->begin(),aa->end());
 302     connectivityToModify->setPartOfValues3(types,connectivityIndex->begin(),connectivityIndex->end()-1,0,1,1,true);
 303   }
 304   // thirdly renumber cells
 305   MCAuto<DataArrayIdType> aggregatedCellIds( DataArrayIdType::Aggregate(FromVecAutoToVecOfConst<DataArrayIdType>(globalCellIdsReceived)) );
 306   MCAuto<DataArrayIdType> aggregatedCellIdsSorted(aggregatedCellIds->copySorted());
 307   MCAuto<DataArrayIdType> idsIntoAggregatedIds(DataArrayIdType::FindPermutationFromFirstToSecondDuplicate(aggregatedCellIdsSorted,aggregatedCellIds));
 308   MCAuto<DataArrayIdType> cellIdsOfSameNodeIds(aggregatedCellIdsSorted->indexOfSameConsecutiveValueGroups());
 309   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
 310   // TODO : check coordsReceived==globalCellIds
 311   MCAuto<DataArrayIdType> connSorted,indicesSorted;
 312   {
 313     MCAuto<DataArrayIdType> conn(DataArrayIdType::Aggregate(FromVecAutoToVecOfConst<DataArrayIdType>(connectivityReceived)));
 314     MCAuto<DataArrayIdType> connIndex(DataArrayIdType::AggregateIndexes(FromVecAutoToVecOfConst<DataArrayIdType>(connectivityIndexReceived)));
 315     {
 316       DataArrayIdType *indicesSortedTmp(nullptr),*valuesSortedTmp(nullptr);
 317       DataArrayIdType::ExtractFromIndexedArrays(n2o_cells->begin(),n2o_cells->end(),conn,connIndex,valuesSortedTmp,indicesSortedTmp);
 318       indicesSorted = indicesSortedTmp; connSorted=valuesSortedTmp;
 319     }
 320   }
 321   // finalize all
 322   MCAuto<MEDCouplingUMesh> mesh(MEDCouplingUMesh::New(_mesh->getName(),_mesh->getMeshDimension()));
 323   mesh->setConnectivity(connSorted,indicesSorted,true);
 324   mesh->setCoords(finalCoords);
 325   mesh->setDescription(_mesh->getDescription());
 326   MCAuto<ParaUMesh> ret(ParaUMesh::New(mesh,aggregatedCellIdsSorted,finalGlobalNodeIds));
 327   return ret.retn();
 328 }