Work on pdd, works for the first time.....

AMDiS/src/ParallelDomainProblem.cc

@@ -46,17 +46,11 @@ namespace AMDiS {
     partitionMesh(adaptInfo);   
 
 
-    /// === Get rank information about DOFs. ===
-
-    // Stores to each DOF pointer the set of ranks the DOF is part of.
-    std::map<const DegreeOfFreedom*, std::set<int> > partitionDOFs;
-    // Set of all DOFs of the rank.
-    std::vector<const DegreeOfFreedom*> rankDOFs;
-    // Set of all interior boundary DOFs in ranks partition which are owned by 
-    // another rank.
-    std::map<const DegreeOfFreedom*, int> boundaryDOFs;
+    // === Create new global and local DOF numbering. ===
 
-    createDOFMemberInformation(partionDOFs, rankDOFs, boundaryDOFs);
+    int nRankDOFs = 0;
+    int nOverallDOFs = 0;
+    createLocalGlobalNumbering(nRankDOFs, nOverallDOFs);
 
 
     // === Create interior boundary information ===
@@ -67,191 +61,39 @@ namespace AMDiS {
     // === Remove all macro elements that are not part of the rank partition. ===
 
     removeMacroElements();
-
-
-    // === Get starting position for global rank dof ordering ====
-
-    int rstart = 0;
-    int nRankDOFs = rankDofs.size();
-    MPI_Scan(&nRankDOFs, &rstart, 1, MPI_INT, MPI_SUM, PETSC_COMM_WORLD);
-    rstart -= nRankDOFs;
-
-   
-    /// === Create information which dof indices must be send and which must be received. ===
-
-    std::map<int, std::map<DegreeOfFreedom, DegreeOfFreedom> > sendNewDofs;
-    std::map<int, std::vector<DegreeOfFreedom> > recvNewDofs;
-
-    for (std::map<const DegreeOfFreedom*, int>::iterator it = boundaryDofs.begin();
-	 it != boundaryDofs.end();
-	 ++it) {
-
-      if (it->second == mpiRank) {
-	// If the boundary dof is a rank dof, it must be send to other ranks.
-
-	// old global index
-	int oldDofIndex = (it->first)[0];
-	// search for new dof index in ranks partition for this boundary dof
-	int newDofIndex = 0;
-	for (int i = 0; i < static_cast<int>(rankDofs.size()); i++) {
-	  if (rankDofs[i] == it->first) {
-	    newDofIndex = rstart + i;
-	    break;
-	  }
-	}
-
-	// Search for all ranks that have this dof too.
-	for (std::set<int>::iterator itRanks = partitionDofs[it->first].begin();
-	     itRanks != partitionDofs[it->first].end();
-	     ++itRanks) {
-	  if (*itRanks != mpiRank)
-	    sendNewDofs[*itRanks][oldDofIndex] = newDofIndex;
-	}
-      } else {
-	// If the boundary dof is not a rank dof, its new dof index, and later
-	// also the dof values, must be received from another rank.
-	recvNewDofs[it->second].push_back((it->first)[0]);
-      }
-    }
-
-
-    /// === Send and receive the dof indices at boundary. ===
-
-    std::vector<int*> sendBuffers(sendNewDofs.size());
-    std::vector<int*> recvBuffers(recvNewDofs.size());
-    
-    int i = 0;
-    for (std::map<int, std::map<DegreeOfFreedom, DegreeOfFreedom> >::iterator sendIt = sendNewDofs.begin();
-	 sendIt != sendNewDofs.end();
-	 ++sendIt, i++) {
-      sendBuffers[i] = new int[sendIt->second.size() * 2];
-      int c = 0;
-      for (std::map<DegreeOfFreedom, DegreeOfFreedom>::iterator dofIt = sendIt->second.begin();
-	   dofIt != sendIt->second.end();
-	   ++dofIt, c += 2) {
-	sendBuffers[i][c] = dofIt->first;
-	sendBuffers[i][c + 1] = dofIt->second;
-
-	sendDofs[sendIt->first].push_back(dofIt->second);
-      }
-
-      mpiComm.Isend(sendBuffers[i], sendIt->second.size() * 2, MPI_INT, sendIt->first, 0);
-    }
-
-    i = 0;
-    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator recvIt = recvNewDofs.begin();
-	 recvIt != recvNewDofs.end();
-	 ++recvIt, i++) {
-      recvBuffers[i] = new int[recvIt->second.size() * 2];
-
-      mpiComm.Irecv(recvBuffers[i], recvIt->second.size() * 2, MPI_INT, recvIt->first, 0);
-    }
-
-
-    mpiComm.Barrier();
-
-    
-    /// === Delete send buffers. ===
-
-    i = 0;
-    for (std::map<int, std::map<DegreeOfFreedom, DegreeOfFreedom> >::iterator sendIt = sendNewDofs.begin();
-	 sendIt != sendNewDofs.end();
-	 ++sendIt, i++) 
-      delete [] sendBuffers[i];
-
-
-    /// === Change dof indices for rank partition. ===
-
-    for (int i = 0; i < static_cast<int>(rankDofs.size()); i++) {
-      const_cast<DegreeOfFreedom*>(rankDofs[i])[0] = i; 
-      mapLocalGlobalDOFs[i] = rstart + i;
-      mapGlobalLocalDOFs[rstart + i] = i;
-      isRankDOF[i] = true;
-    }
-
-
-    /// === Change dof indices at boundary from other ranks. ===
-
-    i = 0;
-    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator recvIt = recvNewDofs.begin();
-	 recvIt != recvNewDofs.end();
-	 ++recvIt, i++) {
-
-      for (int j = 0; j < static_cast<int>(recvIt->second.size()); j++) {
-
-	int oldDof = recvBuffers[i][j * 2];
-	int newDof = recvBuffers[i][j * 2 + 1];
-	int newLocalDof = mapLocalGlobalDOFs.size();
-
-	recvDofs[recvIt->first].push_back(newDof);
-
-	for (std::map<const DegreeOfFreedom*, int>::iterator dofIt = boundaryDofs.begin();
-	     dofIt != boundaryDofs.end();
-	     ++dofIt) {
-	  if ((dofIt->first)[0] == oldDof) {
-	    const_cast<DegreeOfFreedom*>(dofIt->first)[0] = newLocalDof;
-	    mapLocalGlobalDOFs[newLocalDof] = newDof;
-	    mapGlobalLocalDOFs[newDof] = newLocalDof;
-	    isRankDOF[newLocalDof] = false;
-	    break;
-	  }
-	}
-      }
-
-      delete [] recvBuffers[i];
-    }
-
+      
 
     /// === Reset all DOFAdmins of the mesh. ===
 
     int nAdmins = mesh->getNumberOfDOFAdmin();
     for (int i = 0; i < nAdmins; i++) {
       for (int j = 0; j < mesh->getDOFAdmin(i).getSize(); j++)
-	const_cast<DOFAdmin&>(mesh->getDOFAdmin(i)).setDOFFree(j, true);
-      for (int j = 0; j < mapLocalGlobalDOFs.size(); j++)
-	const_cast<DOFAdmin&>(mesh->getDOFAdmin(i)).setDOFFree(j, false);
+ 	const_cast<DOFAdmin&>(mesh->getDOFAdmin(i)).setDOFFree(j, true);
+      for (int j = 0; j < static_cast<int>(mapLocalGlobalDOFs.size()); j++)
+ 	const_cast<DOFAdmin&>(mesh->getDOFAdmin(i)).setDOFFree(j, false);
     }
 
 
-    /// === Create local information from sendDofs and recvDofs
-
-    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator it = sendDofs.begin();
-	 it != sendDofs.end();
-	 ++it)
-      for (std::vector<DegreeOfFreedom>::iterator dofIt = it->second.begin();
-	   dofIt != it->second.end();
-	   dofIt++)
-	*dofIt = mapGlobalLocalDOFs[*dofIt];
-
-    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator it = recvDofs.begin();
-	 it != recvDofs.end();
-	 ++it)
-      for (std::vector<DegreeOfFreedom>::iterator dofIt = it->second.begin();
-	   dofIt != it->second.end();
-	   dofIt++)
-	*dofIt = mapGlobalLocalDOFs[*dofIt];
-      
-
     /// === Create petsc matrix. ===
 
     int ierr;
     ierr = MatCreate(PETSC_COMM_WORLD, &petscMatrix);
-    ierr = MatSetSizes(petscMatrix, rankDofs.size(), rankDofs.size(),
-		       partitionDofs.size(), partitionDofs.size());
+    ierr = MatSetSizes(petscMatrix, nRankDOFs, nRankDOFs, nOverallDOFs, nOverallDOFs);
     ierr = MatSetType(petscMatrix, MATAIJ);
 
     ierr = VecCreate(PETSC_COMM_WORLD, &petscRhsVec);
-    ierr = VecSetSizes(petscRhsVec, rankDofs.size(), partitionDofs.size());    
+    ierr = VecSetSizes(petscRhsVec, nRankDOFs, nOverallDOFs);
     ierr = VecSetType(petscRhsVec, VECMPI);
 
     ierr = VecCreate(PETSC_COMM_WORLD, &petscSolVec);
-    ierr = VecSetSizes(petscSolVec, rankDofs.size(), partitionDofs.size());    
+    ierr = VecSetSizes(petscSolVec, nRankDOFs, nOverallDOFs);
     ierr = VecSetType(petscSolVec, VECMPI);
   }
 
   void ParallelDomainProblemBase::exitParallelization(AdaptInfo *adaptInfo)
   {}
 
+
   void ParallelDomainProblemBase::fillPetscMatrix(DOFMatrix *mat, 
 						  DOFVector<double> *vec)
   {
@@ -289,6 +131,7 @@ namespace AMDiS {
     }
   }
 
+
   void ParallelDomainProblemBase::solvePetscMatrix(DOFVector<double> *vec)
   {
     KSP ksp;
@@ -322,7 +165,7 @@ namespace AMDiS {
 	 ++sendIt, i++) {
       sendBuffers[i] = new double[sendIt->second.size()];
 
-      for (int j = 0; j < sendIt->second.size(); j++)
+      for (int j = 0; j < static_cast<int>(sendIt->second.size()); j++)
 	sendBuffers[i][j] = (*vec)[(sendIt->second)[j]];
 
       mpiComm.Isend(sendBuffers[i], sendIt->second.size(), MPI_DOUBLE, sendIt->first, 0);
@@ -344,16 +187,17 @@ namespace AMDiS {
     for (std::map<int, std::vector<DegreeOfFreedom> >::iterator recvIt = recvDofs.begin();
 	 recvIt != recvDofs.end();
 	 ++recvIt, i++) {
-      for (int j = 0; j < recvIt->second.size(); j++)
+      for (int j = 0; j < static_cast<int>(recvIt->second.size()); j++)
 	(*vec)[(recvIt->second)[j]] = recvBuffers[i][j];
 
       delete [] recvBuffers[i];
     }
     
-    for (int i = 0; i < sendBuffers.size(); i++)
+    for (int i = 0; i < static_cast<int>(sendBuffers.size()); i++)
       delete [] sendBuffers[i];    
   }
 
+
   double ParallelDomainProblemBase::setElemWeights(AdaptInfo *adaptInfo) 
   {
     double localWeightSum = 0.0;
@@ -388,6 +232,7 @@ namespace AMDiS {
     return localWeightSum;
   }
 
+
   void ParallelDomainProblemBase::partitionMesh(AdaptInfo *adaptInfo)
   {
     if (initialPartitionMesh) {
@@ -402,8 +247,232 @@ namespace AMDiS {
     partitioner->fillCoarsePartitionVec(&partitionVec);
   }
 
+
+  void ParallelDomainProblemBase::createInteriorBoundaryInfo()
+  {
+    TraverseStack stack;
+    ElInfo *elInfo = stack.traverseFirst(mesh, -1, Mesh::CALL_LEAF_EL | Mesh::FILL_NEIGH);
+    while (elInfo) {
+      Element *element = elInfo->getElement();
+
+      // Hidde elements which are not part of ranks partition.
+      PartitionElementData *partitionData = 
+	dynamic_cast<PartitionElementData*>(element->getElementData(PARTITION_ED));   
+      if (partitionData->getPartitionStatus() == IN) {
+	for (int i = 0; i < 3; i++) {
+	  if (!elInfo->getNeighbour(i))
+	    continue;
+
+	  PartitionElementData *neighbourPartitionData =
+	    dynamic_cast<PartitionElementData*>(elInfo->getNeighbour(i)->getElementData(PARTITION_ED));
+ 	  if (neighbourPartitionData->getPartitionStatus() == OUT) {
+ 	    AtomicBoundary& bound = interiorBoundary.
+	      getNewAtomicBoundary(partitionVec[elInfo->getNeighbour(i)->getIndex()]);
+ 	    bound.rankObject.el = element;
+ 	    bound.rankObject.subObjAtBoundary = EDGE;
+ 	    bound.rankObject.ithObjAtBoundary = i;
+ 	    bound.neighbourObject.el = elInfo->getNeighbour(i);
+ 	    bound.neighbourObject.subObjAtBoundary = EDGE;
+ 	    bound.neighbourObject.ithObjAtBoundary = -1;
+ 	  }
+	}
+      }
+
+      elInfo = stack.traverseNext(elInfo);
+    }
+  }
+
+
+  void ParallelDomainProblemBase::removeMacroElements()
+  {
+    std::vector<MacroElement*> macrosToRemove;
+    for (std::deque<MacroElement*>::iterator it = mesh->firstMacroElement();
+	 it != mesh->endOfMacroElements();
+	 ++it) {
+      PartitionElementData *partitionData = 
+	dynamic_cast<PartitionElementData*>
+	((*it)->getElement()->getElementData(PARTITION_ED));
+      if (partitionData->getPartitionStatus() != IN)
+	macrosToRemove.push_back(*it);
+    }
+
+    mesh->removeMacroElements(macrosToRemove);
+  }
+
+
+  void ParallelDomainProblemBase::createLocalGlobalNumbering(int& nRankDOFs, 
+							     int& nOverallDOFs)
+  {
+    /// === Get rank information about DOFs. ===
+
+    // Stores to each DOF pointer the set of ranks the DOF is part of.
+    std::map<const DegreeOfFreedom*, std::set<int> > partitionDOFs;
+    // Set of all DOFs of the rank.
+    std::vector<const DegreeOfFreedom*> rankDOFs;
+    // Set of all interior boundary DOFs in ranks partition which are owned by 
+    // another rank.
+    std::map<const DegreeOfFreedom*, int> boundaryDOFs;
+
+    createDOFMemberInfo(partitionDOFs, rankDOFs, boundaryDOFs);
+
+    nRankDOFs = rankDOFs.size();
+    nOverallDOFs = partitionDOFs.size();
+
+    // === Get starting position for global rank dof ordering ====
+
+    int rstart = 0;
+    MPI_Scan(&nRankDOFs, &rstart, 1, MPI_INT, MPI_SUM, PETSC_COMM_WORLD);
+    rstart -= nRankDOFs;
+
+   
+    /// === Create information which dof indices must be send and which must be received. ===
+
+    std::map<int, std::map<DegreeOfFreedom, DegreeOfFreedom> > sendNewDofs;
+    std::map<int, std::vector<DegreeOfFreedom> > recvNewDofs;
+
+    for (std::map<const DegreeOfFreedom*, int>::iterator it = boundaryDOFs.begin();
+	 it != boundaryDOFs.end();
+	 ++it) {
+
+      if (it->second == mpiRank) {
+	// If the boundary dof is a rank dof, it must be send to other ranks.
+
+	// old global index
+	int oldDofIndex = (it->first)[0];
+	// search for new dof index in ranks partition for this boundary dof
+	int newDofIndex = 0;
+	for (int i = 0; i < static_cast<int>(rankDOFs.size()); i++) {
+	  if (rankDOFs[i] == it->first) {
+	    newDofIndex = rstart + i;
+	    break;
+	  }
+	}
+
+	// Search for all ranks that have this dof too.
+	for (std::set<int>::iterator itRanks = partitionDOFs[it->first].begin();
+	     itRanks != partitionDOFs[it->first].end();
+	     ++itRanks) {
+	  if (*itRanks != mpiRank)
+	    sendNewDofs[*itRanks][oldDofIndex] = newDofIndex;
+	}
+      } else {
+	// If the boundary dof is not a rank dof, its new dof index, and later
+	// also the dof values, must be received from another rank.
+	recvNewDofs[it->second].push_back((it->first)[0]);
+      }
+    }
+
+
+    /// === Send and receive the dof indices at boundary. ===
+
+    std::vector<int*> sendBuffers(sendNewDofs.size());
+    std::vector<int*> recvBuffers(recvNewDofs.size());
+    
+    int i = 0;
+    for (std::map<int, std::map<DegreeOfFreedom, DegreeOfFreedom> >::iterator sendIt = sendNewDofs.begin();
+	 sendIt != sendNewDofs.end();
+	 ++sendIt, i++) {
+      sendBuffers[i] = new int[sendIt->second.size() * 2];
+      int c = 0;
+      for (std::map<DegreeOfFreedom, DegreeOfFreedom>::iterator dofIt = sendIt->second.begin();
+	   dofIt != sendIt->second.end();
+	   ++dofIt, c += 2) {
+	sendBuffers[i][c] = dofIt->first;
+	sendBuffers[i][c + 1] = dofIt->second;
+
+	sendDofs[sendIt->first].push_back(dofIt->second);
+      }
+
+      mpiComm.Isend(sendBuffers[i], sendIt->second.size() * 2, MPI_INT, sendIt->first, 0);
+    }
+
+    i = 0;
+    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator recvIt = recvNewDofs.begin();
+	 recvIt != recvNewDofs.end();
+	 ++recvIt, i++) {
+      recvBuffers[i] = new int[recvIt->second.size() * 2];
+
+      mpiComm.Irecv(recvBuffers[i], recvIt->second.size() * 2, MPI_INT, recvIt->first, 0);
+    }
+
+
+    mpiComm.Barrier();
+
+    
+    /// === Delete send buffers. ===
+
+    i = 0;
+    for (std::map<int, std::map<DegreeOfFreedom, DegreeOfFreedom> >::iterator sendIt = sendNewDofs.begin();
+	 sendIt != sendNewDofs.end();
+	 ++sendIt, i++) 
+      delete [] sendBuffers[i];
+
+
+    /// === Change dof indices for rank partition. ===
+
+    for (int i = 0; i < static_cast<int>(rankDOFs.size()); i++) {
+      const_cast<DegreeOfFreedom*>(rankDOFs[i])[0] = i; 
+      mapLocalGlobalDOFs[i] = rstart + i;
+      mapGlobalLocalDOFs[rstart + i] = i;
+      isRankDOF[i] = true;
+    }
+
+
+    /// === Change dof indices at boundary from other ranks. ===
+
+    i = 0;
+    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator recvIt = recvNewDofs.begin();
+	 recvIt != recvNewDofs.end();
+	 ++recvIt, i++) {
+
+      for (int j = 0; j < static_cast<int>(recvIt->second.size()); j++) {
+
+	int oldDof = recvBuffers[i][j * 2];
+	int newDof = recvBuffers[i][j * 2 + 1];
+	int newLocalDof = mapLocalGlobalDOFs.size();
+
+	recvDofs[recvIt->first].push_back(newDof);
+
+	for (std::map<const DegreeOfFreedom*, int>::iterator dofIt = boundaryDOFs.begin();
+	     dofIt != boundaryDOFs.end();
+	     ++dofIt) {
+	  if ((dofIt->first)[0] == oldDof) {
+	    const_cast<DegreeOfFreedom*>(dofIt->first)[0] = newLocalDof;
+	    mapLocalGlobalDOFs[newLocalDof] = newDof;
+	    mapGlobalLocalDOFs[newDof] = newLocalDof;
+	    isRankDOF[newLocalDof] = false;
+	    break;
+	  }
+	}
+      }
+
+      delete [] recvBuffers[i];
+    }
+
+
+    /// === Create local information from sendDofs and recvDofs
+
+    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator it = sendDofs.begin();
+	 it != sendDofs.end();
+	 ++it)
+      for (std::vector<DegreeOfFreedom>::iterator dofIt = it->second.begin();
+	   dofIt != it->second.end();
+	   dofIt++)
+	*dofIt = mapGlobalLocalDOFs[*dofIt];
+
+    for (std::map<int, std::vector<DegreeOfFreedom> >::iterator it = recvDofs.begin();
+	 it != recvDofs.end();
+	 ++it)
+      for (std::vector<DegreeOfFreedom>::iterator dofIt = it->second.begin();
+	   dofIt != it->second.end();
+	   dofIt++)
+	*dofIt = mapGlobalLocalDOFs[*dofIt];  
+  }
+
+
+
   void ParallelDomainProblemBase::createDOFMemberInfo(
-		       std::map<const DegreeOfFreedom*, std::set<int>& partitionDOFs,
+		       std::map<const DegreeOfFreedom*, std::set<int> >& partitionDOFs,
 		       std::vector<const DegreeOfFreedom*>& rankDOFs,
 		       std::map<const DegreeOfFreedom*, int>& boundaryDOFs)
   {
@@ -460,60 +529,6 @@ namespace AMDiS {
     }
   }
 
-  void ParallelDomainProblemBase::createInteriorBoundaryInfo()
-  {
-    TraverseStack stack;
-    ElInfo *elInfo = stack.traverseFirst(mesh, -1, Mesh::CALL_LEAF_EL | Mesh::FILL_NEIGH);
-    while (elInfo) {
-      Element *element = elInfo->getElement();
-
-      // Hidde elements which are not part of ranks partition.
-      PartitionElementData *partitionData = 
-	dynamic_cast<PartitionElementData*>(element->getElementData(PARTITION_ED));   
-      if (partitionData->getPartitionStatus() == IN) {
-	for (int i = 0; i < 3; i++) {
-	  if (!elInfo->getNeighbour(i))
-	    continue;
-
-	  PartitionElementData *neighbourPartitionData =
-	    dynamic_cast<PartitionElementData*>(elInfo->getNeighbour(i)->getElementData(PARTITION_ED));
- 	  if (neighbourPartitionData->getPartitionStatus() == OUT) {
- 	    AtomicBoundary& bound = interiorBoundary.
-	      getNewAtomicBoundary(partitionVec[elInfo->getNeighbour(i)->getIndex()]);
- 	    bound.rankObject.el = element;
- 	    bound.rankObject.subObjAtBoundary = EDGE;
- 	    bound.rankObject.ithObjAtBoundary = i;
- 	    bound.neighbourObject.el = elInfo->getNeighbour(i);
- 	    bound.neighbourObject.subObjAtBoundary = EDGE;
- 	    bound.neighbourObject.ithObjAtBoundary = -1;
- 	  }
-	}
-      }
-
-      elInfo = stack.traverseNext(elInfo);
-    }
-  }
-
-  void ParallelDomainProblemBase::removeMacroElements()
-  {
-    std::vector<MacroElement*> macrosToRemove;
-    for (std::deque<MacroElement*>::iterator it = mesh->firstMacroElement();
-	 it != mesh->endOfMacroElements();
-	 ++it) {
-      PartitionElementData *partitionData = 
-	dynamic_cast<PartitionElementData*>
-	((*it)->getElement()->getElementData(PARTITION_ED));
-      if (partitionData->getPartitionStatus() != IN)
-	macrosToRemove.push_back(*it);
-    }
-
-    mesh->removeMacroElements(macrosToRemove);
-  }
-
-  void ParallelDomainProblemBase::createLocalGlobalOrder()
-  {
-  }
-
 
   ParallelDomainProblemScal::ParallelDomainProblemScal(const std::string& name,
 						       ProblemScal *problem,

AMDiS/src/ParallelDomainProblem.h

@@ -23,6 +23,7 @@
 #define AMDIS_PARALLELDOMAINPROBLEM_H
 
 #include <map>
+#include <set>
 #include <vector>
 
 #include "ProblemTimeInterface.h"
@@ -90,19 +91,16 @@ namespace AMDiS {
       iterationIF->endIteration(adaptInfo);
     }
 
-    virtual int getNumProblems() {}
+    virtual int getNumProblems() 
+    {
+      return 0;
+    }
 
     inline virtual const std::string& getName() 
     { 
       return name; 
     }
 
-    /// Returns pointer to \ref applicationOrdering.
-    AO* getApplicationOrdering() 
-    {
-      return &applicationOrdering;
-    }
-
     /// Returns \ref nRankDOFs, the number of DOFs in the rank mesh.
     int getNumberRankDOFs() 
     {
@@ -113,7 +111,10 @@ namespace AMDiS {
 
     void solvePetscMatrix(DOFVector<double> *vec);
 
-    virtual ProblemStatBase *getProblem(int number = 0) {}
+    virtual ProblemStatBase *getProblem(int number = 0) 
+    {
+      return NULL;