ParallelDebug.cc 26.8 KB
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//
// Software License for AMDiS
//
// Copyright (c) 2010 Dresden University of Technology 
// All rights reserved.
// Authors: Simon Vey, Thomas Witkowski et al.
//
// This file is part of AMDiS
//
// See also license.opensource.txt in the distribution.


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#include "ParallelDebug.h"
#include "MeshDistributor.h"
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#include "ProblemVec.h"
#include "DOFVector.h"
#include "FixVec.h"
#include "StdMpi.h"
#include "Debug.h"
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#include "MpiHelper.h"
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namespace AMDiS {

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  void ParallelDebug::testInteriorBoundary(MeshDistributor &pdb)
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  {
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    FUNCNAME("ParallelDebug::testInteriorBoundary()");
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    typedef MeshDistributor::RankToBoundMap RankToBoundMap;
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    std::vector<int*> sendBuffers, recvBuffers;

    MPI::Request request[pdb.myIntBoundary.boundary.size() + 
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			 pdb.otherIntBoundary.boundary.size() +
                         pdb.periodicBoundary.boundary.size() * 2];
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    int requestCounter = 0;

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    // === Send rank's boundary information. ===

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    for (RankToBoundMap::iterator rankIt = pdb.myIntBoundary.boundary.begin();
	 rankIt != pdb.myIntBoundary.boundary.end(); ++rankIt) {

      int nSendInt = rankIt->second.size();
      int* buffer = new int[nSendInt];
      for (int i = 0; i < nSendInt; i++)
	buffer[i] = (rankIt->second)[i].rankObj.elIndex;
      
      sendBuffers.push_back(buffer);
      
      request[requestCounter++] =
	pdb.mpiComm.Isend(buffer, nSendInt, MPI_INT, rankIt->first, 0);
    }

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    // === Receive information from other ranks about the interior boundaries. ====

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    for (RankToBoundMap::iterator rankIt = pdb.otherIntBoundary.boundary.begin();
	 rankIt != pdb.otherIntBoundary.boundary.end(); ++rankIt) {
      int nRecvInt = rankIt->second.size();
      int *buffer = new int[nRecvInt];
      recvBuffers.push_back(buffer);

      request[requestCounter++] = 
	pdb.mpiComm.Irecv(buffer, nRecvInt, MPI_INT, rankIt->first, 0);
    }


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    // === To the last, do the same of periodic boundaries. ===

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    for (RankToBoundMap::iterator rankIt = pdb.periodicBoundary.boundary.begin();       
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	 rankIt != pdb.periodicBoundary.boundary.end(); ++rankIt) {
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      if (rankIt->first == pdb.mpiRank)
	continue;

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      int nValues = rankIt->second.size();
      int* sBuffer = new int[nValues];
      for (int i = 0; i < nValues; i++)
	sBuffer[i] = (rankIt->second)[i].rankObj.elIndex;

      sendBuffers.push_back(sBuffer);

      request[requestCounter++] =
	pdb.mpiComm.Isend(sBuffer, nValues, MPI_INT, rankIt->first, 0);

      int *rBuffer = new int[nValues];
      recvBuffers.push_back(rBuffer);

      request[requestCounter++] = 
	pdb.mpiComm.Irecv(rBuffer, nValues, MPI_INT, rankIt->first, 0);      
    }

    // === Finish communication and delete all send buffers. ===

    MPI::Request::Waitall(requestCounter, request);
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    for (int i = 0; i < static_cast<int>(sendBuffers.size()); i++)
      delete [] sendBuffers[i];

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    // === Finally, check the results, i.e., the indices of element at the     === 
    // === boundaries, if they fit together. First check the interior bounds,  ===
    // === and after this the periodic ones.                                   ===

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    int bufCounter = 0;
    for (RankToBoundMap::iterator rankIt = pdb.otherIntBoundary.boundary.begin();
	 rankIt != pdb.otherIntBoundary.boundary.end(); ++rankIt) {

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      TEST_EXIT(rankIt->second.size() == 
		pdb.otherIntBoundary.boundary[rankIt->first].size())
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	("Boundaries does not fit together!\n");      

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      for (unsigned int i = 0; i < rankIt->second.size(); i++) {
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	int elIndex1 = recvBuffers[bufCounter][i];
	int elIndex2 = pdb.otherIntBoundary.boundary[rankIt->first][i].neighObj.elIndex;

	TEST_EXIT(elIndex1 == elIndex2)("Wrong element index at interior boundary!\n");
      }

      delete [] recvBuffers[bufCounter++];
    }
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    for (RankToBoundMap::iterator rankIt = pdb.periodicBoundary.boundary.begin();
	 rankIt != pdb.periodicBoundary.boundary.end(); ++rankIt) {
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      if (rankIt->first == pdb.mpiRank)
	continue;

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      for (unsigned int i = 0; i < rankIt->second.size(); i++) {
	int elIndex1 = recvBuffers[bufCounter][i];
	int elIndex2 = pdb.periodicBoundary.boundary[rankIt->first][i].neighObj.elIndex;

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	TEST_EXIT(elIndex1 == elIndex2)
	  ("Wrong element index at periodic boundary el %d with rank %d: %d %d\n", 
	   pdb.periodicBoundary.boundary[rankIt->first][i].rankObj.elIndex,
	   rankIt->first, elIndex1, elIndex2);
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      }

      delete [] recvBuffers[bufCounter++];
    }
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  }


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  void ParallelDebug::testPeriodicBoundary(MeshDistributor &pdb)
  {
    FUNCNAME("ParallelDebug::testPeriodicBoundary()");

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    // === 1. check: All periodic DOFs should have at least a correct number ===
    // === of periodic associations.                                         ===

    for (map<int, std::set<BoundaryType> >::iterator it = pdb.periodicDofAssociations.begin();
	 it != pdb.periodicDofAssociations.end(); ++it) {
      WorldVector<double> c;
      pdb.mesh->getDofIndexCoords(it->first, pdb.feSpace, c);
      int nAssoc = it->second.size();
      TEST_EXIT_DBG(nAssoc == 1 || nAssoc == 3 || (pdb.mesh->getDim() == 3 && nAssoc == 7))
	("Should not happen! DOF %d (%e %e %e) has %d periodic associations!\n", 
	 it->first, c[0], c[1], (pdb.mesh->getDim() == 2 ? 0.0 : c[2]), nAssoc);
    }    


    // === 2. check: All periodic DOFs must be symmetric, i.e., if A is mapped ===
    // === to B, then B must be mapped to A.                                   ===

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    typedef MeshDistributor::PeriodicDofMap PeriodicDofMap;

    StdMpi<PeriodicDofMap> stdMpi(pdb.mpiComm, true);

    if (pdb.mpiRank == 0) {
      for (int i = 1; i < pdb.mpiSize; i++)
	stdMpi.recv(i);
    } else {
      stdMpi.send(0, pdb.periodicDof);
    }

    stdMpi.startCommunication<int>(MPI_INT);

    int foundError = 0;

    // === The boundary DOFs are checked only on the zero rank. === 

    if (pdb.mpiRank == 0) {
      std::map<int, PeriodicDofMap> rankToMaps;
      PeriodicDofMap dofMap = pdb.periodicDof;
      rankToMaps[0] = dofMap;

      for (int i = 1; i < pdb.mpiSize; i++) {
	PeriodicDofMap &otherMap = stdMpi.getRecvData(i);
	rankToMaps[i] = otherMap;
	
	for (PeriodicDofMap::iterator it = otherMap.begin(); 
	     it != otherMap.end(); ++it) {
	  for (MeshDistributor::DofMapping::iterator dofIt = it->second.begin();
	       dofIt != it->second.end(); ++dofIt) {
	    if (dofMap.count(it->first) == 1 &&
		dofMap[it->first].count(dofIt->first) == 1) {
	      TEST_EXIT_DBG(dofMap[it->first][dofIt->first] == dofIt->second)
		("Should not happen!\n");
	    } else {
	      dofMap[it->first][dofIt->first] = dofIt->second;
	    }
	  }
	}
      }


      // === Now we test if global DOF A is mapped to B, then B must be mapped ===
      // === to A for the same boundary type.                                  ===

      for (PeriodicDofMap::iterator it = dofMap.begin(); 
	   it != dofMap.end(); ++it) {
	for (MeshDistributor::DofMapping::iterator dofIt = it->second.begin();
	     dofIt != it->second.end(); ++dofIt) {
	  if (it->second[dofIt->second] != dofIt->first) {
	    MSG("[DBG]  For boundary type %d: DOF %d -> %d, but %d -> %d!\n",
		it ->first, 
		dofIt->first, dofIt->second, 
		dofIt->second, it->second[dofIt->second]);

	    for (int i = 0; i < pdb.mpiSize; i++) {
	      if (rankToMaps[i][it->first].count(dofIt->first) == 1) {
		MSG("[DBG]    %d -> %d in rank %d\n", 
		    dofIt->first, rankToMaps[i][it->first][dofIt->first], i);
	      }

	      if (rankToMaps[i][it->first].count(dofIt->second) == 1) {
		MSG("[DBG]    %d -> %d in rank %d\n", 
		    dofIt->second, rankToMaps[i][it->first][dofIt->second], i);
	      }
	    }
	    
	    ERROR("Wrong periodic DOFs!\n");
	    foundError = 1;
	  }
	}
      }
    }

    mpi::globalAdd(foundError);
    TEST_EXIT(foundError == 0)("Error found on at least on rank!\n");
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    // === 3. check: On all edge and face periodic DOFs, at least on coordinate of ===
    // === each periodic DOF pair must be equal (at least as long we consider      ===
    // === periodic boundaries only on rectangulars and boxes.                     ===

    RankToCoords sendCoords;
    std::map<int, std::vector<BoundaryType> > rankToDofType;

    for (InteriorBoundary::RankToBoundMap::iterator it = pdb.periodicBoundary.boundary.begin();
	 it != pdb.periodicBoundary.boundary.end(); ++it) {
      if (it->first == pdb.mpiRank)
	continue;

      for (vector<AtomicBoundary>::iterator boundIt = it->second.begin();
	   boundIt != it->second.end(); ++boundIt) {	
	if (boundIt->rankObj.subObj == VERTEX)
	  continue;

	DofContainer dofs;
	boundIt->rankObj.el->getVertexDofs(pdb.feSpace, boundIt->rankObj, dofs);
	boundIt->rankObj.el->getNonVertexDofs(pdb.feSpace, boundIt->rankObj, dofs);
	
	for (unsigned int i = 0; i < dofs.size(); i++) {
	  WorldVector<double> c;
	  pdb.mesh->getDofIndexCoords(*(dofs[i]), pdb.feSpace, c);
	  sendCoords[it->first].push_back(c);
	  rankToDofType[it->first].push_back(boundIt->type);
	}
      }
    }

    // Each rank must receive exactly the same number of coordinates as it sends
    // to another rank.
    RankToCoords recvCoords;
    for (RankToCoords::iterator it = sendCoords.begin(); 
	 it != sendCoords.end(); ++it)
      recvCoords[it->first].resize(it->second.size());


    StdMpi<CoordsVec> stdMpiCoords(pdb.mpiComm, true);
    stdMpiCoords.send(sendCoords);
    stdMpiCoords.recv(recvCoords);   
    stdMpiCoords.startCommunication<double>(MPI_DOUBLE);


    for (RankToCoords::iterator it = sendCoords.begin(); 
	 it != sendCoords.end(); ++it) {
      for (unsigned int i = 0; i < it->second.size(); i++) {
	WorldVector<double> &c0 = it->second[i];
	WorldVector<double> &c1 = stdMpiCoords.getRecvData(it->first)[i];


	int nEqual = 0;
	for (int j = 0; j < pdb.mesh->getDim(); j++)
	  if (c0[j] == c1[j])
	    nEqual++;

	if ((rankToDofType[it->first][i] >= -3 && nEqual < 2) ||
	    (rankToDofType[it->first][i] < -3 && nEqual == 0)) {
	  MSG("[DBG]  %d-ith periodic DOF in boundary between ranks %d <-> %d is not correct!\n",
	      i, pdb.mpiRank, it->first);
	  MSG("[DBG]  Coords on rank %d: %f %f %f\n", 
	      pdb.mpiRank, c0[0], c0[1], (pdb.mesh->getDim() == 3 ? c0[2] : 0.0));
	  MSG("[DBG]  Coords on rank %d: %f %f %f\n", 
	      it->first, c1[0], c1[1], (pdb.mesh->getDim() == 3 ? c1[2] : 0.0));

	  foundError = 1;
	}
      }
    }

    mpi::globalAdd(foundError);
    TEST_EXIT(foundError == 0)("Wrond periodic coordinates found on at least on rank!\n");
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  }


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  void ParallelDebug::testCommonDofs(MeshDistributor &pdb, bool printCoords)
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  {
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    FUNCNAME("ParallelDebug::testCommonDofs()");
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    clock_t first = clock();

    int testCommonDofs = 1;
    GET_PARAMETER(0, "dbg->test common dofs", "%d", &testCommonDofs);
    if (testCommonDofs == 0) {
      MSG("Skip test common dofs!\n");
      return;
    }

    /// Defines a mapping type from rank numbers to sets of DOFs.
    typedef std::map<int, DofContainer> RankToDofContainer;

    // Maps to each neighbour rank an array of WorldVectors. This array contains the 
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    // coordinates of all DOFs this rank shares on the interior boundary with the 
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    // neighbour rank. A rank sends the coordinates to another rank, if it owns the
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    // boundarys DOFs.
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    RankToCoords sendCoords;

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    // A rank receives all boundary DOFs that are at its interior boundaries but are
    // not owned by the rank. This map stores for each rank the coordinates of DOFs
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    // this rank expectes to receive from.
    RankToCoords recvCoords;

    DOFVector<WorldVector<double> > coords(pdb.feSpace, "dofCorrds");
    pdb.mesh->getDofIndexCoords(pdb.feSpace, coords);
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    for (RankToDofContainer::iterator it = pdb.sendDofs.begin();
	 it != pdb.sendDofs.end(); ++it)
      for (DofContainer::iterator dofIt = it->second.begin(); 
	   dofIt != it->second.end(); ++dofIt)
	sendCoords[it->first].push_back(coords[**dofIt]);

    for (RankToDofContainer::iterator it = pdb.recvDofs.begin();
	 it != pdb.recvDofs.end(); ++it)
      for (DofContainer::iterator dofIt = it->second.begin();
	   dofIt != it->second.end(); ++dofIt)
	recvCoords[it->first].push_back(coords[**dofIt]);

    std::vector<int> sendSize(pdb.mpiSize, 0);
    std::vector<int> recvSize(pdb.mpiSize, 0);
    std::vector<int> recvSizeBuffer(pdb.mpiSize, 0);
    MPI::Request request[(pdb.mpiSize - 1) * 2];
    int requestCounter = 0;

    for (RankToCoords::iterator it = sendCoords.begin(); it != sendCoords.end(); ++it)
      sendSize[it->first] = it->second.size();

    for (RankToCoords::iterator it = recvCoords.begin(); it != recvCoords.end(); ++it)
      recvSize[it->first] = it->second.size();

    for (int i = 0; i < pdb.mpiSize; i++) {
      if (i == pdb.mpiRank)
	continue;

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      request[requestCounter++] = 
	pdb.mpiComm.Isend(&(sendSize[i]), 1, MPI_INT, i, 0);
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    }   

    for (int i = 0; i < pdb.mpiSize; i++) {
      if (i == pdb.mpiRank)
	continue;

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      request[requestCounter++] = 
	pdb.mpiComm.Irecv(&(recvSizeBuffer[i]), 1, MPI_INT, i, 0);
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    }

    MPI::Request::Waitall(requestCounter, request);


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    int foundError = 0;
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    for (int i = 0; i < pdb.mpiSize; i++) {
      if (i == pdb.mpiRank)
	continue;

      if (recvSize[i] != recvSizeBuffer[i]) {
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	ERROR("MPI rank %d expectes to receive %d DOFs from rank %d. But this rank sends %d DOFs!\n", 
	      pdb.mpiRank, recvSize[i], i, recvSizeBuffer[i]);	
	foundError = 1;
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      }
    }
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    mpi::globalAdd(foundError);
    TEST_EXIT(foundError == 0)("Error found on at least on rank!\n");
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    // === Now we know that the number of send and received DOFs fits together. ===
    // === So we can check if also the coordinates of the communicated DOFs are ===
    // === the same on both corresponding ranks.                                ===

    StdMpi<CoordsVec> stdMpi(pdb.mpiComm, true);
    stdMpi.send(sendCoords);
    stdMpi.recv(recvCoords);   
    stdMpi.startCommunication<double>(MPI_DOUBLE);

    int dimOfWorld = Global::getGeo(WORLD);

    // === Compare the received with the expected coordinates. ===

    for (RankToCoords::iterator it = stdMpi.getRecvData().begin(); 
	 it != stdMpi.getRecvData().end(); ++it) {
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      for (unsigned int i = 0; i < it->second.size(); i++) {
	WorldVector<double> tmp = (it->second)[i];
	tmp -=  recvCoords[it->first][i];
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	if (norm(tmp) > 1e-13) {
	  // === Print error message if the coordinates are not the same. ===
	  if (printCoords) {
	    MSG("[DBG] i = %d\n", i);	  
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	    std::stringstream oss;
	    oss.precision(5);
	    oss << "[DBG] Rank " << pdb.mpiRank << " from rank " << it->first
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		<< " expect coords (";
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	    for (int k = 0; k < dimOfWorld; k++) {
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	      oss << recvCoords[it->first][i][k];
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	      if (k + 1 < dimOfWorld)
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		oss << " / ";
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	    }
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	    oss << ")  received coords (";
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	    for (int k = 0; k < dimOfWorld; k++) {
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	      oss << (it->second)[i][k];
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	      if (k + 1 < dimOfWorld)
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		oss << " / ";
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	    }
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	    oss << ")";
	    MSG("%s\n", oss.str().c_str());
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	    debug::printInfoByDof(pdb.feSpace, *(pdb.recvDofs[it->first][i]));
	  }
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	  ERROR("Wrong DOFs in rank %d!\n", pdb.mpiRank);
	  foundError = 1;
	}	 
      }
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    }
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    mpi::globalAdd(foundError);
    TEST_EXIT(foundError == 0)("Error found on at least on rank!\n");
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    INFO(pdb.info, 8)("Test common dofs needed %.5f seconds\n", TIME_USED(first, clock()));
  }


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  void ParallelDebug::testGlobalIndexByCoords(MeshDistributor &pdb)
  {
    FUNCNAME("ParallelDebug::testGlobalIndexByCoords()");

    DOFVector<WorldVector<double> > coords(pdb.feSpace, "tmp");
    pdb.mesh->getDofIndexCoords(pdb.feSpace, coords);

    typedef std::map<WorldVector<double>, int> CoordsIndexMap;
    CoordsIndexMap coordsToIndex;

    DOFIterator<WorldVector<double> > it(&coords, USED_DOFS);
    for (it.reset(); !it.end(); ++it)
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      coordsToIndex[(*it)] = pdb.mapLocalGlobalDofs[it.getDOFIndex()];    
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    StdMpi<CoordsIndexMap> stdMpi(pdb.mpiComm, true);
    for (RankToDofContainer::iterator it = pdb.sendDofs.begin();
	 it != pdb.sendDofs.end(); ++it)
      stdMpi.send(it->first, coordsToIndex);
    for (RankToDofContainer::iterator it = pdb.recvDofs.begin();
	 it != pdb.recvDofs.end(); ++it)
      stdMpi.recv(it->first);
   
    stdMpi.startCommunication<double>(MPI_DOUBLE); 

    int foundError = 0;
    for (RankToDofContainer::iterator it = pdb.recvDofs.begin();
	 it != pdb.recvDofs.end(); ++it) {
      CoordsIndexMap& otherCoords = stdMpi.getRecvData(it->first);

      for (CoordsIndexMap::iterator coordsIt = otherCoords.begin();
	   coordsIt != otherCoords.end(); ++coordsIt) {
	if (coordsToIndex.count(coordsIt->first) == 1 &&
	    coordsToIndex[coordsIt->first] != coordsIt->second) {
	  std::stringstream oss;
	  oss.precision(5);
	  oss << "DOF at coords ";
	  for (int i = 0; i < Global::getGeo(WORLD); i++)
	    oss << coordsIt->first[i] << " ";
	  oss << " do not fit together on rank " 
	      << pdb.getMpiRank() << " (global index: " 
	      << coordsToIndex[coordsIt->first] << " and on rank "
	      << it->first << " (global index: " << coordsIt->second << ")";

	  MSG("[DBG] %s\n", oss.str().c_str());
	  foundError = 1;
	}
      }
    }

    mpi::globalAdd(foundError);
    TEST_EXIT(foundError == 0)("Error found on at least on rank!\n");
  }

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  void ParallelDebug::testAllElements(MeshDistributor &pdb)
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  {
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    FUNCNAME("ParallelDebug::testAllElements()");
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    std::set<int> macroElements;
    int minElementIndex = std::numeric_limits<int>::max();
    int maxElementIndex = std::numeric_limits<int>::min();   

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    TraverseStack stack;
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    ElInfo *elInfo = stack.traverseFirst(pdb.mesh, 0, Mesh::CALL_EL_LEVEL);
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    while (elInfo) {
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      int elIndex = elInfo->getElement()->getIndex();
      minElementIndex = std::min(minElementIndex, elIndex);
      maxElementIndex = std::max(maxElementIndex, elIndex);
      macroElements.insert(elInfo->getElement()->getIndex());
      elInfo = stack.traverseNext(elInfo);      
    }
    
    int globalMinIndex, globalMaxIndex;
    pdb.mpiComm.Allreduce(&minElementIndex, &globalMinIndex, 1, MPI_INT, MPI_MIN);
    pdb.mpiComm.Allreduce(&maxElementIndex, &globalMaxIndex, 1, MPI_INT, MPI_MAX);
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    TEST_EXIT(globalMinIndex == 0)("No macro element with index 0!\n");
    for (int i = 0; i <= globalMaxIndex; i++) {
      int sendId = macroElements.count(i);
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      int recvId = 0;
      pdb.mpiComm.Allreduce(&sendId, &recvId, 1, MPI_INT, MPI_SUM);

      if (recvId != 1 && pdb.mpiRank == 0) {
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	if (recvId == 0) {
	  ERROR_EXIT("Element %d has no member partition!\n", i);
	}
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	if (recvId > 1) {
	  ERROR_EXIT("Element %d is member of more than pne partition!\n", i);
	}
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      }
    }
  }


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  void ParallelDebug::testDofContainerCommunication(MeshDistributor &pdb, 
						    RankToDofContainer &sendDofs,
						    RankToDofContainer &recvDofs)
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  {
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    FUNCNAME("ParallelDebug::testDofContainerCommunication()");
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    std::map<int, int> sendNumber;
    for (RankToDofContainer::iterator it = sendDofs.begin(); it != sendDofs.end(); ++it)
      sendNumber[it->first] = it->second.size();
    
    StdMpi<int> stdMpi(pdb.mpiComm);
    stdMpi.send(sendNumber);
    for (RankToDofContainer::iterator it = recvDofs.begin(); it != recvDofs.end(); ++it)    
      stdMpi.recv(it->first);
    stdMpi.startCommunication<int>(MPI_INT);    
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    int foundError = 0;
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    for (std::map<int, int>::iterator it = stdMpi.getRecvData().begin();
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	 it != stdMpi.getRecvData().end(); ++it) {
      if (it->second != static_cast<int>(recvDofs[it->first].size())) {
	ERROR("Rank expectes %d DOFs to receive from rank %d, but %d DOFs are received!\n", 
	      recvDofs[it->first].size(), it->first, it->second);
	foundError = 1;
      }
    }

    mpi::globalAdd(foundError);
    TEST_EXIT(foundError == 0)("Error found on at least one rank!\n");
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  }


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  void ParallelDebug::testDoubleDofs(Mesh *mesh)
  {
    FUNCNAME("ParallelDebug::testDoubleDofs()");

    std::map<WorldVector<double>, DegreeOfFreedom> cMap;
    int foundError = 0;

    TraverseStack stack;
    ElInfo *elInfo = stack.traverseFirst(mesh, -1, Mesh::CALL_LEAF_EL | Mesh::FILL_COORDS);
    while (elInfo) {
      for (int i = 0; i < 3; i++) {
	WorldVector<double> &c = elInfo->getCoord(i);
	if (cMap.count(c) == 0) {
	  cMap[c] = elInfo->getElement()->getDof(i, 0);
	} else {
	  if (cMap[c] != elInfo->getElement()->getDof(i, 0)) {
	    MSG("[DBG] Found two DOFs %d and %d with the same coords %f %f!\n",
		cMap[c], elInfo->getElement()->getDof(i, 0), c[0], c[1]);
	    foundError = 1;
	  }
	}
      }
      
      elInfo = stack.traverseNext(elInfo);
    }
    
    mpi::globalAdd(foundError);
    TEST_EXIT(foundError == 0)("Error found on at least one rank!\n");
  }


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  void ParallelDebug::printMapLocalGlobal(MeshDistributor &pdb, int rank)
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  {    
    if (rank == -1 || pdb.mpiRank == rank) {
      std::cout << "====== DOF MAP LOCAL -> GLOBAL ====== " << std::endl;
      
      typedef std::map<DegreeOfFreedom, DegreeOfFreedom> DofMapping;
      typedef std::map<int, DofContainer> RankToDofContainer;

      for (DofMapping::iterator it = pdb.mapLocalGlobalDofs.begin();
	   it != pdb.mapLocalGlobalDofs.end(); it++) {
	DegreeOfFreedom localdof = -1;
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	if (pdb.mapLocalDofIndex.count(it->first) > 0)
	  localdof = pdb.mapLocalDofIndex[it->first];
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	std::cout << "DOF " << it->first << " " 
		  << it->second << " " 
		  << localdof << std::endl;
	WorldVector<double> coords;
	pdb.mesh->getDofIndexCoords(it->first, pdb.feSpace, coords);
	coords.print();

	for (RankToDofContainer::iterator rankit = pdb.sendDofs.begin();
	     rankit != pdb.sendDofs.end(); ++rankit) {
	  for (DofContainer::iterator dofit = rankit->second.begin();
	       dofit != rankit->second.end(); ++dofit)
	    if (**dofit == it->first)
	      std::cout << "SEND DOF TO " << rankit->first << std::endl;	  
	}

	for (RankToDofContainer::iterator rankit = pdb.recvDofs.begin();
	     rankit != pdb.recvDofs.end(); ++rankit) {
	  for (DofContainer::iterator dofit = rankit->second.begin();
	       dofit != rankit->second.end(); ++dofit)
	    if (**dofit == it->first)
	      std::cout << "RECV DOF FROM " << rankit->first << std::endl;	  
	}

	std::cout << "------" << std::endl;
      }
    }
  }


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  void ParallelDebug::printMapPeriodic(MeshDistributor &pdb, int rank)
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  {
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    FUNCNAME("ParallelDebug::printMapPeriodic()");
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    ERROR_EXIT("Function must be rewritten!\n");

#if 0
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    typedef std::map<DegreeOfFreedom, DegreeOfFreedom> DofMapping;
    typedef std::map<DegreeOfFreedom, std::set<DegreeOfFreedom> > PeriodicDofMap;

    if (rank == -1 || pdb.mpiRank == rank) {
      std::cout << "====== DOF MAP PERIODIC ====== " << std::endl;

      for (PeriodicDofMap::iterator it = pdb.periodicDof.begin();
	   it != pdb.periodicDof.end(); ++it) {
	std::cout << "DOF MAP " << it->first << ": ";
	for (std::set<DegreeOfFreedom>::iterator dofit = it->second.begin();
	     dofit != it->second.end(); ++dofit)
	  std::cout << *dofit << " ";
	std::cout << std::endl;

	DegreeOfFreedom localdof = -1;
	for (DofMapping::iterator dofIt = pdb.mapLocalGlobalDofs.begin();
	     dofIt != pdb.mapLocalGlobalDofs.end(); ++dofIt)
	  if (dofIt->second == it->first)
	    localdof = dofIt->first;

	TEST_EXIT(localdof != -1)("There is something wrong!\n");

	WorldVector<double> coords;
	pdb.mesh->getDofIndexCoords(localdof, pdb.feSpace, coords);
	coords.print();
      }
    }
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#endif
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  }

  
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  void ParallelDebug::printRankDofs(MeshDistributor &pdb, 
				    int rank, 
				    DofContainer& rankDofs,
				    DofContainer& rankAllDofs)
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  {
    if (rank == -1 || pdb.mpiRank == rank) {
      std::cout << "====== RANK DOF INFORMATION ====== " << std::endl;

      std::cout << "  RANK OWNED DOFS: " << std::endl;
      for (DofContainer::iterator dofit = rankDofs.begin();
	   dofit != rankDofs.end(); ++dofit) {
	std::cout << "    " << **dofit << std::endl;
	WorldVector<double> coords;
	pdb.mesh->getDofIndexCoords(*dofit, pdb.feSpace, coords);
	coords.print();
      }

      std::cout << "  RANK ALL DOFS: " << std::endl;
      for (DofContainer::iterator dofit = rankAllDofs.begin();
	   dofit != rankAllDofs.end(); ++dofit) {
	std::cout << "    " << **dofit << std::endl;
	WorldVector<double> coords;
	pdb.mesh->getDofIndexCoords(*dofit, pdb.feSpace, coords);
	coords.print();
      }      
    }
  }

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  void ParallelDebug::printBoundaryInfo(MeshDistributor &pdb)
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  {
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    FUNCNAME("ParallelDebug::printBoundaryInfo()");
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    for (InteriorBoundary::iterator it(pdb.myIntBoundary); !it.end(); ++it) {
      MSG("Rank owned boundary with rank %d: \n", it.getRank());
      MSG("  ranks obj-ind: %d  sub-obj: %d   ith-obj: %d\n",
	  it->rankObj.elIndex, it->rankObj.subObj, it->rankObj.ithObj);
      MSG("  neigh obj-ind: %d  sub-obj: %d   ith-obj: %d\n",
	  it->neighObj.elIndex, it->neighObj.subObj, it->neighObj.ithObj);
    }

    for (InteriorBoundary::iterator it(pdb.otherIntBoundary); !it.end(); ++it) {
      MSG("Other owned boundary with rank %d: \n", it.getRank());
      MSG("  ranks obj-ind: %d  sub-obj: %d   ith-obj: %d\n",
	  it->rankObj.elIndex, it->rankObj.subObj, it->rankObj.ithObj);
      MSG("  neigh obj-ind: %d  sub-obj: %d   ith-obj: %d\n",
	  it->neighObj.elIndex, it->neighObj.subObj, it->neighObj.ithObj);
    }
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    for (InteriorBoundary::iterator it(pdb.periodicBoundary); !it.end(); ++it) {
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      MSG("Periodic boundary (ID %d) with rank %d: \n", 
	  it->type, it.getRank());
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      MSG("  ranks obj-ind: %d  sub-obj: %d   ith-obj: %d\n",
	  it->rankObj.elIndex, it->rankObj.subObj, it->rankObj.ithObj);
      MSG("  neigh obj-ind: %d  sub-obj: %d   ith-obj: %d\n",
	  it->neighObj.elIndex, it->neighObj.subObj, it->neighObj.ithObj);
    }    
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  }

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  void ParallelDebug::writeDebugFile(MeshDistributor &pdb,
				     std::string prefix, std::string postfix)
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  {
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    FUNCNAME("ParallelDebug::writeCoordsFile()");
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    std::stringstream filename;
    filename << prefix << "-" << pdb.mpiRank << "." << postfix;

    DOFVector<WorldVector<double> > coords(pdb.feSpace, "tmp");
    pdb.mesh->getDofIndexCoords(pdb.feSpace, coords);

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    typedef std::map<int, std::vector<DegreeOfFreedom> > ElDofMap;
    ElDofMap elDofMap;
    TraverseStack stack;
    const BasisFunction *basisFcts = pdb.feSpace->getBasisFcts();
    std::vector<DegreeOfFreedom> localIndices(basisFcts->getNumber());
    ElInfo *elInfo = stack.traverseFirst(pdb.mesh, -1, Mesh::CALL_LEAF_EL);
    while (elInfo) {
      basisFcts->getLocalIndices(elInfo->getElement(), 
				 pdb.feSpace->getAdmin(), localIndices);
      elDofMap[elInfo->getElement()->getIndex()] = localIndices;
      elInfo = stack.traverseNext(elInfo);
    }

    // === Write informations about all DOFs. ===

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    std::ofstream file;
    file.open(filename.str().c_str());
    file << coords.getUsedSize() << "\n";
    DOFIterator<WorldVector<double> > it(&coords, USED_DOFS);
    for (it.reset(); !it.end(); ++it) {
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      file << it.getDOFIndex() << " " 
	   << pdb.mapLocalGlobalDofs[it.getDOFIndex()] << " "
	   << pdb.getIsRankDof(it.getDOFIndex());
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      for (int i = 0; i < pdb.mesh->getDim(); i++)
	file << " " << (*it)[i];
      file << "\n";
    }
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    // === Write to all elements in ranks mesh the included dofs. ===

    file << elDofMap.size() << "\n";
    file << basisFcts->getNumber() << "\n";
    for (ElDofMap::iterator it = elDofMap.begin(); it != elDofMap.end(); ++it) {
      file << it->first << "\n";
      for (int i = 0; i < basisFcts->getNumber(); i++) 
	file << it->second[i] << " ";
      file << "\n";
    }

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    file.close();
  }

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}