PetscSolverFeti.cc 71.2 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 "AMDiS.h"
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#include "MatrixVector.h"
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#include "parallel/PetscHelper.h"
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#include "parallel/PetscSolverFeti.h"
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#include "parallel/PetscSolverFetiDebug.h"
#include "parallel/PetscSolverFetiMonitor.h"
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#include "parallel/PetscSolverFetiStructs.h"
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#include "parallel/PetscSolverFetiOperators.h"
#include "parallel/PetscSolverFetiTimings.h"
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#include "parallel/StdMpi.h"
#include "parallel/MpiHelper.h"
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#include "parallel/PetscSolverGlobalMatrix.h"
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#include "io/VtkWriter.h"
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namespace AMDiS {

  using namespace std;

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  PetscSolverFeti::PetscSolverFeti()
    : PetscSolver(),
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      schurPrimalSolver(0),
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      multiLevelTest(false),
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      subdomain(NULL),
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      massMatrixSolver(NULL),
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      meshLevel(0),
      rStartInterior(0),
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      nGlobalOverallInterior(0),
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      printTimings(false),
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      stokesMode(false),
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      augmentedLagrange(false),
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      pressureComponent(-1)
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  {
    FUNCNAME("PetscSolverFeti::PetscSolverFeti()");

    string preconditionerName = "";
    Parameters::get("parallel->solver->precon", preconditionerName);
    if (preconditionerName == "" || preconditionerName == "none") {
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      MSG("Create FETI-DP solver with no preconditioner!\n");
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      fetiPreconditioner = FETI_NONE;
    } else if (preconditionerName == "dirichlet") {
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      MSG("Create FETI-DP solver with Dirichlet preconditioner!\n");
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      fetiPreconditioner = FETI_DIRICHLET;
    } else if (preconditionerName == "lumped") {
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      MSG("Create FETI-DP solver with lumped preconditioner!\n");
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      fetiPreconditioner = FETI_LUMPED;
    } else {
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      ERROR_EXIT("Preconditioner \"%s\" not available!\n", 
		 preconditionerName.c_str());
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    }
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    Parameters::get("parallel->feti->schur primal solver", schurPrimalSolver);
    TEST_EXIT(schurPrimalSolver == 0 || schurPrimalSolver == 1)
      ("Wrong solver \"%d\"for the Schur primal complement!\n", 
       schurPrimalSolver);
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    Parameters::get("parallel->multi level test", multiLevelTest);
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    if (multiLevelTest)
      meshLevel = 1;
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    Parameters::get("parallel->print timings", printTimings);
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    Parameters::get("parallel->feti->augmented lagrange", augmentedLagrange);
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  }


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  void PetscSolverFeti::initialize(vector<const FiniteElemSpace*> feSpaces)
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  {
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    FUNCNAME("PetscSolverFeti::initialize()");

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    TEST_EXIT_DBG(meshLevel + 1 == meshDistributor->getMeshLevelData().getLevelNumber())
      ("Mesh hierarchy does not contain %d levels!\n", meshLevel + 1);

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    MeshLevelData& levelData = meshDistributor->getMeshLevelData();
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    vector<const FiniteElemSpace*>& uniqueFe = meshDistributor->getFeSpaces();
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    stokesMode = false;
    Parameters::get("parallel->feti->stokes mode", stokesMode);
    if (stokesMode) {
      Parameters::get("parallel->feti->pressure component", pressureComponent);
      TEST_EXIT(pressureComponent >= 0)
	("FETI-DP in Stokes mode, no pressure component defined!\n");

      pressureFeSpace = feSpaces[pressureComponent];
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    }
			   
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    if (subdomain == NULL) {
      subdomain = new PetscSolverGlobalMatrix();
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      if (meshLevel == 0) {
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	subdomain->setMeshDistributor(meshDistributor, 
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				      mpiCommGlobal, mpiCommLocal);
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      } else {
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	subdomain->setMeshDistributor(meshDistributor, 
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				      levelData.getMpiComm(meshLevel - 1),
				      levelData.getMpiComm(meshLevel));
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	subdomain->setLevel(meshLevel);
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      }
    }
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    primalDofMap.init(levelData, feSpaces, uniqueFe);   
    dualDofMap.init(levelData, feSpaces, uniqueFe, false);
    localDofMap.init(levelData, feSpaces, uniqueFe, meshLevel != 0);
    lagrangeMap.init(levelData, feSpaces, uniqueFe);
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    if (stokesMode)
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      interfaceDofMap.init(levelData, feSpaces, uniqueFe);
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    if (fetiPreconditioner == FETI_DIRICHLET) {
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      TEST_EXIT(meshLevel == 0)
	("Dirichlet preconditioner not yet implemented for multilevel FETI-DP\n");

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      interiorDofMap.init(levelData, feSpaces, uniqueFe, false);
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    }
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  }


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  void PetscSolverFeti::createDirichletData(Matrix<DOFMatrix*> &mat)
  {
    FUNCNAME("PetscSolverFeti::createDirichletData()");

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    bool removeDirichletRows = false;
    Parameters::get("parallel->feti->remove dirichlet", removeDirichletRows);
    if (!removeDirichletRows)
      return;

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    int nComponents = mat.getSize();
    for (int i = 0; i < nComponents; i++) {
      DOFMatrix* dofMat = mat[i][i];
      if (!dofMat)
	continue;
      
      const FiniteElemSpace *feSpace = dofMat->getRowFeSpace();
      std::set<DegreeOfFreedom>& dRows = dofMat->getDirichletRows();
      if (dirichletRows.count(feSpace)) {
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	// === Run test if Dirichlet rows are all the same in all components ===
	// === of one FE space.                                              ===
	TEST_EXIT(dirichletRows[feSpace].size() == dRows.size())
	  ("Wrong number of dirichlet rows!\n");
	
	for (std::set<DegreeOfFreedom>::iterator it0 = dirichletRows[feSpace].begin(),
	       it1 = dRows.begin(); it1 != dRows.end(); ++it0, ++it1) {
	  TEST_EXIT(*it0 == *it1)("Wrong DOFs %d %d!\n", *it0, *it1);
	}
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      } else {
	dirichletRows[feSpace] = dRows;
      }
    }
  }


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  void PetscSolverFeti::createFetiData()
  {
    FUNCNAME("PetscSolverFeti::createFetiData()");

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    double timeCounter = MPI::Wtime();

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    TEST_EXIT(meshDistributor)("No mesh distributor object defined!\n");
    TEST_EXIT(meshDistributor->getFeSpaces().size() > 0)
      ("No FE space defined in mesh distributor!\n");
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    MeshLevelData& levelData = meshDistributor->getMeshLevelData();

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    primalDofMap.clear();
    dualDofMap.clear();
    lagrangeMap.clear();
    localDofMap.clear();
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    if (fetiPreconditioner == FETI_DIRICHLET)
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      interiorDofMap.clear();

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    primalDofMap.setDofComm(meshDistributor->getDofComm());
    lagrangeMap.setDofComm(meshDistributor->getDofComm());
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    primalDofMap.setMpiComm(levelData.getMpiComm(0), 0);
    dualDofMap.setMpiComm(levelData.getMpiComm(0), 0);
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    lagrangeMap.setMpiComm(levelData.getMpiComm(0), 0);
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    localDofMap.setMpiComm(levelData.getMpiComm(meshLevel), meshLevel);
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    if (fetiPreconditioner == FETI_DIRICHLET)
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      interiorDofMap.setMpiComm(levelData.getMpiComm(meshLevel), meshLevel);
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    if (meshLevel == 0)
      localDofMap.setDofComm(meshDistributor->getDofComm());
    else
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      localDofMap.setDofComm(meshDistributor->getDofCommSd());

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    if (stokesMode) {
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      interfaceDofMap.clear();
      interfaceDofMap.setDofComm(meshDistributor->getDofComm());
      interfaceDofMap.setMpiComm(levelData.getMpiComm(0), 0);
    }

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    for (unsigned int i = 0; i < meshDistributor->getFeSpaces().size(); i++) {
      const FiniteElemSpace *feSpace = meshDistributor->getFeSpace(i);
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      createPrimals(feSpace);  

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      createDuals(feSpace);

      createInterfaceNodes(feSpace);
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      createIndexB(feSpace);     
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    }
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    primalDofMap.update();
    dualDofMap.update();
    localDofMap.update();
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    if (fetiPreconditioner == FETI_DIRICHLET)
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      interiorDofMap.update();
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    if (stokesMode)
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      interfaceDofMap.update();

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    for (unsigned int i = 0; i < meshDistributor->getFeSpaces().size(); i++) {
      const FiniteElemSpace *feSpace = meshDistributor->getFeSpace(i);
      createLagrange(feSpace);
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      createAugmentedLagrange(feSpace);
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    }
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    lagrangeMap.update();


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    // === ===

    if (meshLevel == 0) {
      rStartInterior = 0;
      nGlobalOverallInterior = localDofMap.getOverallDofs();
    } else {
      MeshLevelData& levelData = meshDistributor->getMeshLevelData();

      int groupRowsInterior = 0;
      if (levelData.getMpiComm(1).Get_rank() == 0)
	groupRowsInterior = localDofMap.getOverallDofs();

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      mpi::getDofNumbering(mpiCommGlobal, groupRowsInterior,
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			   rStartInterior, nGlobalOverallInterior);

      int tmp = 0;
      if (levelData.getMpiComm(1).Get_rank() == 0)
	tmp = rStartInterior;

      levelData.getMpiComm(1).Allreduce(&tmp, &rStartInterior, 1, MPI_INT, MPI_SUM);
    }

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    MSG("FETI-DP data created on mesh level %d\n", meshLevel);
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    for (unsigned int i = 0; i < meshDistributor->getFeSpaces().size(); i++) {
      const FiniteElemSpace *feSpace = meshDistributor->getFeSpace(i);
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      MSG("FETI-DP data for %d-ith FE space: %p\n", i, feSpace);
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      if (feSpace == pressureFeSpace) {
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	MSG("  nRankInterface = %d  nOverallInterface = %d\n",
	    interfaceDofMap[feSpace].nRankDofs, 
	    interfaceDofMap[feSpace].nOverallDofs);
      } else {
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	MSG("  nRankPrimals = %d   nLocalPrimals = %d  nOverallPrimals = %d\n", 
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	    primalDofMap[feSpace].nRankDofs, 
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	    primalDofMap[feSpace].nLocalDofs,
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	    primalDofMap[feSpace].nOverallDofs);
	
	MSG("  nRankDuals = %d  nOverallDuals = %d\n",
	    dualDofMap[feSpace].nRankDofs, 
	    dualDofMap[feSpace].nOverallDofs);
	
	MSG("  nRankLagrange = %d  nOverallLagrange = %d\n",
	    lagrangeMap[feSpace].nRankDofs, 
	    lagrangeMap[feSpace].nOverallDofs);

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// 	TEST_EXIT_DBG(localDofMap[feSpace].size() + primalDofMap[feSpace].size() == 
// 		      static_cast<unsigned int>(feSpace->getAdmin()->getUsedDofs()))
// 	  ("Should not happen!\n");	
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      }
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    }
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    subdomain->setDofMapping(&localDofMap);
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    subdomain->setCoarseSpaceDofMapping(&primalDofMap); 
    if (stokesMode)
      subdomain->setCoarseSpaceDofMapping(&interfaceDofMap, pressureComponent);
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    if (printTimings) {
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      MPI::COMM_WORLD.Barrier();
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      timeCounter = MPI::Wtime() - timeCounter;
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      MSG("FETI-DP timing 01: %.5f seconds (creation of basic data structures)\n", 
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	  timeCounter);
    }
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  }


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  void PetscSolverFeti::createPrimals(const FiniteElemSpace *feSpace)
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  {
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    FUNCNAME("PetscSolverFeti::createPrimals()");  
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    if (feSpace == pressureFeSpace)
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      return;

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    // === Define all vertices on the interior boundaries of the macro mesh ===
    // === to be primal variables.                                          ===

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    // Set of DOF indices that are considered to be primal variables.
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    DofContainerSet& vertices = 
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      meshDistributor->getBoundaryDofInfo(feSpace, meshLevel).geoDofs[VERTEX];
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    DofIndexSet primals;
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    for (DofContainerSet::iterator it = vertices.begin(); 
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	 it != vertices.end(); ++it) {
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      if (dirichletRows[feSpace].count(**it))
	continue;
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      if (meshLevel == 0) {
	primals.insert(**it);
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      } else {
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	double e = 1e-8;
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	WorldVector<double> c;
	feSpace->getMesh()->getDofIndexCoords(*it, feSpace, c);

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	if (fabs(c[0]) < e || fabs(c[1]) < e ||
	    fabs(c[0] - 25.0) < e || fabs(c[1] - 25.0) < e ||
	    (fabs(c[0] - 12.5) < e && fabs(c[1] - 12.5) < e)) {
	  MSG("PRIMAL COORD %f %f\n", c[0], c[1]);
	  primals.insert(**it);
	}
      }
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    }
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    // === Calculate the number of primals that are owned by the rank and ===
    // === create local indices of the primals starting at zero.          ===

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    for (DofIndexSet::iterator it = primals.begin(); it != primals.end(); ++it)
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      if (meshDistributor->getDofMap()[feSpace].isRankDof(*it))
	primalDofMap[feSpace].insertRankDof(*it);
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      else
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  	primalDofMap[feSpace].insertNonRankDof(*it);
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  }


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  void PetscSolverFeti::createDuals(const FiniteElemSpace *feSpace)
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  {
    FUNCNAME("PetscSolverFeti::createDuals()");
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    if (feSpace == pressureFeSpace)
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      return;

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    // === Create global index of the dual nodes on each rank. ===

    DofContainer allBoundaryDofs;
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    meshDistributor->getAllBoundaryDofs(feSpace, meshLevel, allBoundaryDofs);
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    for (DofContainer::iterator it = allBoundaryDofs.begin();
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	 it != allBoundaryDofs.end(); ++it) {
      if (dirichletRows[feSpace].count(**it))
	continue;

      if (isPrimal(feSpace, **it))
	continue;

      if (meshLevel == 0) {
	dualDofMap[feSpace].insertRankDof(**it);
      } else {
	if (meshDistributor->getDofMapSd()[feSpace].isRankDof(**it))
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	  dualDofMap[feSpace].insertRankDof(**it);
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      }	  
    }
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  }

  
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  void PetscSolverFeti::createInterfaceNodes(const FiniteElemSpace *feSpace)
  {
    FUNCNAME("PetscSolverFeti::createInterfaceNodes()");

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    if (feSpace != pressureFeSpace)
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      return;

    DofContainer allBoundaryDofs;
    meshDistributor->getAllBoundaryDofs(feSpace, meshLevel, allBoundaryDofs);

    for (DofContainer::iterator it = allBoundaryDofs.begin();
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	 it != allBoundaryDofs.end(); ++it) {
      if (dirichletRows[feSpace].count(**it))
	continue;      
      
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      if (meshDistributor->getDofMap()[feSpace].isRankDof(**it))
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	interfaceDofMap[feSpace].insertRankDof(**it);
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      else
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	interfaceDofMap[feSpace].insertNonRankDof(**it);      
    }
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  }


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  void PetscSolverFeti::createLagrange(const FiniteElemSpace *feSpace)
  {
    FUNCNAME("PetscSolverFeti::createLagrange()");

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    if (feSpace == pressureFeSpace)
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      return;

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    boundaryDofRanks[feSpace].clear();

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    // Stores for all rank owned communication DOFs, if the counterpart is
    // a rank owned DOF in its subdomain. Thus, the following map stores to
    // each rank number all DOFs that fulfill this requirenment.
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    map<int, std::set<DegreeOfFreedom> > sdRankDofs;
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    if (meshLevel > 0) {
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      StdMpi<vector<int> > stdMpi(mpiCommGlobal);
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      for (DofComm::Iterator it(meshDistributor->getDofComm().getRecvDofs(), 
				meshLevel, feSpace);
	   !it.end(); it.nextRank()) {

	vector<int> subdomainRankDofs;
	subdomainRankDofs.reserve(it.getDofs().size());

	for (; !it.endDofIter(); it.nextDof()) {
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	  if (meshDistributor->getDofMapSd()[feSpace].isRankDof(it.getDofIndex()))
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	    subdomainRankDofs.push_back(1);
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	  else
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	    subdomainRankDofs.push_back(0);
	}

	stdMpi.send(it.getRank(), subdomainRankDofs);
      }	     

      for (DofComm::Iterator it(meshDistributor->getDofComm().getSendDofs(), 
				meshLevel, feSpace);
	   !it.end(); it.nextRank())
	stdMpi.recv(it.getRank());

      stdMpi.startCommunication();

      for (DofComm::Iterator it(meshDistributor->getDofComm().getSendDofs(), 
				meshLevel, feSpace); 
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	   !it.end(); it.nextRank())
	for (; !it.endDofIter(); it.nextDof())
	  if (!isPrimal(feSpace, it.getDofIndex()))
	    if (stdMpi.getRecvData(it.getRank())[it.getDofCounter()] == 1)
	      sdRankDofs[it.getRank()].insert(it.getDofIndex());
    }
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    if (dualDofMap[feSpace].nLocalDofs == 0)
      return;


    // === Create for each dual node that is owned by the rank, the set ===
    // === of ranks that contain this node (denoted by W(x_j)).         ===

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    int mpiRank = meshDistributor->getMpiRank();
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    for (DofComm::Iterator it(meshDistributor->getDofComm().getSendDofs(), 
			      meshLevel, feSpace); 
	 !it.end(); it.nextRank()) {
      for (; !it.endDofIter(); it.nextDof()) {
	if (!isPrimal(feSpace, it.getDofIndex())) {
	  boundaryDofRanks[feSpace][it.getDofIndex()].insert(mpiRank);

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 	  if (meshLevel == 0 ||
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 	      (meshLevel > 0 && sdRankDofs[it.getRank()].count(it.getDofIndex())))
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	    boundaryDofRanks[feSpace][it.getDofIndex()].insert(it.getRank());	  
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	}
      }
    }

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    // === Communicate these sets for all rank owned dual nodes to other ===
    // === ranks that also have this node.                               ===

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    StdMpi<vector<std::set<int> > > stdMpi(meshDistributor->getMpiComm());
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    for (DofComm::Iterator it(meshDistributor->getDofComm().getSendDofs(), meshLevel, feSpace);
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	 !it.end(); it.nextRank())
      for (; !it.endDofIter(); it.nextDof())
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	if (!isPrimal(feSpace, it.getDofIndex()))
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 	  if (meshLevel == 0 ||
 	      (meshLevel > 0 && sdRankDofs[it.getRank()].count(it.getDofIndex())))
	    stdMpi.getSendData(it.getRank()).push_back(boundaryDofRanks[feSpace][it.getDofIndex()]);
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    stdMpi.updateSendDataSize();

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    for (DofComm::Iterator it(meshDistributor->getDofComm().getRecvDofs(), meshLevel, feSpace); 
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	 !it.end(); it.nextRank()) {
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      bool recvFromRank = false;
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      for (; !it.endDofIter(); it.nextDof()) {
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	if (!isPrimal(feSpace, it.getDofIndex())) {
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 	  if (meshLevel == 0 ||
 	      (meshLevel > 0 && 
 	       meshDistributor->getDofMapSd()[feSpace].isRankDof(it.getDofIndex()))) {
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	    recvFromRank = true;
	    break;
	  }
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	}
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      }
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      if (recvFromRank)
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	stdMpi.recv(it.getRank());
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    }
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    stdMpi.startCommunication();

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    for (DofComm::Iterator it(meshDistributor->getDofComm().getRecvDofs(), meshLevel, feSpace); 
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	 !it.end(); it.nextRank()) {
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      int i = 0;
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      for (; !it.endDofIter(); it.nextDof())
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	if (!isPrimal(feSpace, it.getDofIndex()))
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 	  if (meshLevel == 0 ||
 	      (meshLevel > 0 && 
 	       meshDistributor->getDofMapSd()[feSpace].isRankDof(it.getDofIndex())))	    
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	    boundaryDofRanks[feSpace][it.getDofIndex()] = 
	      stdMpi.getRecvData(it.getRank())[i++];
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	  else
	    lagrangeMap[feSpace].insertNonRankDof(it.getDofIndex());
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    }

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    // === Reserve for each dual node, on the rank that owns this node, the ===
    // === appropriate number of Lagrange constraints.                      ===

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    int nRankLagrange = 0;
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    DofMap& dualMap = dualDofMap[feSpace].getMap();
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    for (DofMap::iterator it = dualMap.begin(); it != dualMap.end(); ++it) {
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      if (meshDistributor->getDofMap()[feSpace].isRankDof(it->first)) {
	lagrangeMap[feSpace].insertRankDof(it->first, nRankLagrange);
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	int degree = boundaryDofRanks[feSpace][it->first].size();
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	nRankLagrange += (degree * (degree - 1)) / 2;
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      } else {
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	lagrangeMap[feSpace].insertNonRankDof(it->first);
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      }
    }
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    lagrangeMap[feSpace].nRankDofs = nRankLagrange;
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  }


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  void PetscSolverFeti::createAugmentedLagrange(const FiniteElemSpace *feSpace)
  {
    FUNCNAME("PetscSolverFeti::createAugmentedLagrange()");

    if (!augmentedLagrange)
      return;
  }


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  void PetscSolverFeti::createIndexB(const FiniteElemSpace *feSpace)
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  {
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    FUNCNAME("PetscSolverFeti::createIndexB()");
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    DOFAdmin* admin = feSpace->getAdmin();
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    // === To ensure that all interior node on each rank are listen first in ===
    // === the global index of all B nodes, insert all interior nodes first, ===
    // === without defining a correct index.                                 ===
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    int nLocalInterior = 0;    
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    for (int i = 0; i < admin->getUsedSize(); i++) {
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      if (admin->isDofFree(i) ||
	  isPrimal(feSpace, i) ||
	  isDual(feSpace, i) ||
	  isInterface(feSpace, i) ||
	  dirichletRows[feSpace].count(i))
	continue;      
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      if (meshLevel == 0) {
	localDofMap[feSpace].insertRankDof(i, nLocalInterior);
	
	if (fetiPreconditioner == FETI_DIRICHLET)
	  interiorDofMap[feSpace].insertRankDof(i, nLocalInterior);
	
	nLocalInterior++;	
      } else {
	if (meshDistributor->getDofMapSd()[feSpace].isRankDof(i))
	  localDofMap[feSpace].insertRankDof(i);
	else
	  localDofMap[feSpace].insertNonRankDof(i);
	
	TEST_EXIT_DBG(fetiPreconditioner == FETI_NONE)
	  ("Not yet implemnted!\n");	
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      }
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    }
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    // === And finally, add the global indicies of all dual nodes. ===

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    for (DofMap::iterator it = dualDofMap[feSpace].getMap().begin();
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	 it != dualDofMap[feSpace].getMap().end(); ++it) {
      if (meshLevel == 0) {
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	localDofMap[feSpace].insertRankDof(it->first);
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      } else {
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	if (meshDistributor->getDofMapSd()[feSpace].isRankDof(it->first))
	  localDofMap[feSpace].insertRankDof(it->first);
	else 
	  localDofMap[feSpace].insertNonRankDof(it->first);
      }
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    }
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  }


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  void PetscSolverFeti::createMatLagrange(vector<const FiniteElemSpace*> &feSpaces)
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  {
    FUNCNAME("PetscSolverFeti::createMatLagrange()");

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    double wtime = MPI::Wtime();
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    int mpiRank = meshDistributor->getMpiRank();
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    // === Create distributed matrix for Lagrange constraints. ===

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    MatCreateAIJ(mpiCommGlobal,
		 lagrangeMap.getRankDofs(), localDofMap.getRankDofs(),
		 lagrangeMap.getOverallDofs(), nGlobalOverallInterior,
		 2, PETSC_NULL, 2, PETSC_NULL,
		 &mat_lagrange);
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    MatSetOption(mat_lagrange, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE);
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    Vec vec_scale_lagrange;
    lagrangeMap.createVec(vec_scale_lagrange);

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    // === Create for all duals the corresponding Lagrange constraints. On ===
    // === each rank we traverse all pairs (n, m) of ranks, with n < m,    ===
    // === that contain this node. If the current rank number is r, and    ===
    // === n == r, the rank sets 1.0 for the corresponding constraint, if  ===
    // === m == r, than the rank sets -1.0 for the corresponding           ===
    // === constraint.                                                     ===

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    for (unsigned int k = 0; k < feSpaces.size(); k++) {
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      DofMap &dualMap = dualDofMap[feSpaces[k]].getMap();
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      for (DofMap::iterator it = dualMap.begin(); it != dualMap.end(); ++it) {
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	TEST_EXIT_DBG(boundaryDofRanks[feSpaces[k]].count(it->first))
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	  ("Should not happen!\n");
	
	// Global index of the first Lagrange constriant for this node.
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	int index = lagrangeMap.getMatIndex(k, it->first);
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	// Copy set of all ranks that contain this dual node.
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	vector<int> W(boundaryDofRanks[feSpaces[k]][it->first].begin(), 
		      boundaryDofRanks[feSpaces[k]][it->first].end());
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	// Number of ranks that contain this dual node.
	int degree = W.size();
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	TEST_EXIT_DBG(degree > 1)("Should not happen!\n");
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	int counter = 0;
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	for (int i = 0; i < degree; i++) {
	  for (int j = i + 1; j < degree; j++) {
	    if (W[i] == mpiRank || W[j] == mpiRank) {
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	      MatSetValue(mat_lagrange, 
			  index + counter, 
			  localDofMap.getMatIndex(k, it->first) + rStartInterior,
			  (W[i] == mpiRank ? 1.0 : -1.0),
			  INSERT_VALUES);
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	    }
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	    counter++;
	  }
	}

	// === Create scaling factors for scaling the lagrange matrix, which ===
	// === is required for FETI-DP preconditioners.                      ===
	
	if (meshDistributor->getDofMap()[feSpaces[k]].isRankDof(it->first)) {
	  int nConstraints = (degree * (degree - 1)) / 2;
	  for (int i = 0; i < nConstraints; i++) {
	    VecSetValue(vec_scale_lagrange,
			index + i,
			1.0 / static_cast<double>(degree),
			INSERT_VALUES);
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	  }
	}
      }
    }

    MatAssemblyBegin(mat_lagrange, MAT_FINAL_ASSEMBLY);
    MatAssemblyEnd(mat_lagrange, MAT_FINAL_ASSEMBLY);
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    // === If required, create \ref mat_lagrange_scaled ===

    VecAssemblyBegin(vec_scale_lagrange);
    VecAssemblyEnd(vec_scale_lagrange);

    if (fetiPreconditioner != FETI_NONE || stokesMode) {
      MatDuplicate(mat_lagrange, MAT_COPY_VALUES, &mat_lagrange_scaled);
      MatDiagonalScale(mat_lagrange_scaled, vec_scale_lagrange, PETSC_NULL);
    }

    VecDestroy(&vec_scale_lagrange);


    // === Print final timings. ===

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    if (printTimings) {
      MPI::COMM_WORLD.Barrier();
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      MSG("FETI-DP timing 05: %.5f seconds (creation of lagrange constraint matrix)\n", 
	  MPI::Wtime() - wtime);
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    }
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  }


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  void PetscSolverFeti::createMatAugmentedLagrange(vector<const FiniteElemSpace*> &feSpaces)
  {
    FUNCNAME("PetscSolverFeti::createMatAugmentedLagrange()");

    if (!augmentedLagrange)
      return;

    double wtime = MPI::Wtime();

    nRankEdges = 0;
    nOverallEdges = 0;
    InteriorBoundary &intBound = meshDistributor->getIntBoundary();
    for (InteriorBoundary::iterator it(intBound.getOwn()); !it.end(); ++it)
      if (it->rankObj.subObj == EDGE)
	nRankEdges++;
    
    int rStartEdges = 0;
    mpi::getDofNumbering(mpiCommGlobal, nRankEdges, rStartEdges, nOverallEdges);

    MSG("nRankEdges = %d, nOverallEdges = %d\n", nRankEdges, nOverallEdges);

    nRankEdges *= feSpaces.size();
    rStartEdges *= feSpaces.size();
    nOverallEdges *= feSpaces.size();

    MatCreateAIJ(mpiCommGlobal,
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		 nRankEdges, lagrangeMap.getRankDofs(),
		 nOverallEdges, lagrangeMap.getOverallDofs(),
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		 1, PETSC_NULL, 1, PETSC_NULL, 
		 &mat_augmented_lagrange);
    MatSetOption(mat_augmented_lagrange, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE);

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    int rowCounter = rStartEdges;
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    for (InteriorBoundary::iterator it(intBound.getOwn()); !it.end(); ++it) {
      if (it->rankObj.subObj == EDGE) {
	for (int i = 0; i < feSpaces.size(); i++) {
	  DofContainer edgeDofs;
	  it->rankObj.el->getAllDofs(feSpaces[i], it->rankObj, edgeDofs);

	  MSG("SIZE = %d\n", edgeDofs.size());

	  for (DofContainer::iterator it = edgeDofs.begin();
	       it != edgeDofs.end(); it++) {
	    TEST_EXIT_DBG(isPrimal(feSpaces[i], **it) == false)
	      ("Should not be primal!\n");

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	    if (dirichletRows[feSpaces[i]].count(**it))
	      continue;

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	    int col = lagrangeMap.getMatIndex(i, **it);
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	    double value = 1.0;
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	    MatSetValue(mat_augmented_lagrange, rowCounter, col, value, INSERT_VALUES);
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	  }

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	  rowCounter++;
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	}
      }
    }

    MatAssemblyBegin(mat_augmented_lagrange, MAT_FINAL_ASSEMBLY);
    MatAssemblyEnd(mat_augmented_lagrange, MAT_FINAL_ASSEMBLY);

    if (printTimings) {
      MPI::COMM_WORLD.Barrier();
      MSG("FETI-DP timing 05a: %.5f seconds (creation of augmented lagrange constraint matrix)\n", 
	  MPI::Wtime() - wtime);
    }
  }


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  void PetscSolverFeti::createSchurPrimalKsp(vector<const FiniteElemSpace*> &feSpaces)
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  {
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    FUNCNAME("PetscSolverFeti::createSchurPrimalKsp()");
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    if (schurPrimalSolver == 0) {
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      MSG("Create iterative schur primal solver!\n");

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      if (augmentedLagrange == false) {
	schurPrimalData.subSolver = subdomain;
	
	localDofMap.createVec(schurPrimalData.tmp_vec_b, nGlobalOverallInterior);
	primalDofMap.createVec(schurPrimalData.tmp_vec_primal);
	
	MatCreateShell(mpiCommGlobal,
		       primalDofMap.getRankDofs(), 
		       primalDofMap.getRankDofs(), 
		       primalDofMap.getOverallDofs(), 
		       primalDofMap.getOverallDofs(),
		       &schurPrimalData, 
		       &mat_schur_primal);
	MatShellSetOperation(mat_schur_primal, MATOP_MULT, 
			     (void(*)(void))petscMultMatSchurPrimal);	
      } else {
	schurPrimalAugmentedData.subSolver = subdomain;

	localDofMap.createVec(schurPrimalAugmentedData.tmp_vec_b0, nGlobalOverallInterior);
	localDofMap.createVec(schurPrimalAugmentedData.tmp_vec_b1, nGlobalOverallInterior);
	primalDofMap.createVec(schurPrimalAugmentedData.tmp_vec_primal);
	lagrangeMap.createVec(schurPrimalAugmentedData.tmp_vec_lagrange);

	schurPrimalAugmentedData.mat_lagrange = &mat_lagrange;
	schurPrimalAugmentedData.mat_augmented_lagrange = &mat_augmented_lagrange;

	MatCreateShell(mpiCommGlobal,
		       primalDofMap.getRankDofs() + nRankEdges, 
		       primalDofMap.getRankDofs() + nRankEdges, 
		       primalDofMap.getOverallDofs() + nOverallEdges, 
		       primalDofMap.getOverallDofs() + nOverallEdges,
		       &schurPrimalAugmentedData, 
		       &mat_schur_primal);
	MatShellSetOperation(mat_schur_primal, MATOP_MULT, 
			     (void(*)(void))petscMultMatSchurPrimalAugmented);
      }
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      KSPCreate(mpiCommGlobal, &ksp_schur_primal);
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      KSPSetOperators(ksp_schur_primal, mat_schur_primal, mat_schur_primal, SAME_NONZERO_PATTERN);
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      KSPSetOptionsPrefix(ksp_schur_primal, "schur_primal_");
      KSPSetType(ksp_schur_primal, KSPGMRES);
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      KSPSetFromOptions(ksp_schur_primal);
    } else {
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      MSG("Create direct schur primal solver!\n");

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      double wtime = MPI::Wtime();

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      TEST_EXIT(!augmentedLagrange)("Not yet supported!\n");
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      TEST_EXIT_DBG(meshLevel == 0)
	("Does not support for multilevel, check usage of localDofMap.\n");

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      // === First, calculate matK = inv(A_BB) A_BPi:                      ===
      // ===    - get all local column vectors from A_BPi                  ===
      // ===    - solve with A_BB for this column vector as the rhs vector ===
      // ===    - set the result to the corresponding column vector of     ===
      // ===      matrix matK                                              ===

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      int nRowsRankPrimal = primalDofMap.getRankDofs();
      int nRowsOverallPrimal = primalDofMap.getOverallDofs();
      int nRowsRankB = localDofMap.getRankDofs();
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      // Transform matrix A_BPi into a sparse column format.
      petsc_helper::PetscMatCol mat_b_primal_cols;
      petsc_helper::getMatLocalColumn(subdomain->getMatInteriorCoarse(), 
				      mat_b_primal_cols);
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      TEST_EXIT(static_cast<int>(mat_b_primal_cols.size()) == 
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		primalDofMap.getLocalDofs())
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	("Should not happen!\n");
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      Vec tmpVec;
      VecCreateSeq(PETSC_COMM_SELF, nRowsRankB, &tmpVec);
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      Mat matK;
      MatCreateAIJ(mpiCommGlobal,
		   nRowsRankB, nRowsRankPrimal, 
		   nGlobalOverallInterior, nRowsOverallPrimal,
		   150, PETSC_NULL, 150, PETSC_NULL, &matK);
      MatSetOption(matK, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE);
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      // Solve for all column vectors of mat A_BPi and create matrix matK
      for (petsc_helper::PetscMatCol::iterator it = mat_b_primal_cols.begin();
	   it != mat_b_primal_cols.end(); ++it) {
	petsc_helper::getColumnVec(it->second, tmpVec);
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	subdomain->solve(tmpVec, tmpVec);
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	petsc_helper::setMatLocalColumn(matK, it->first, tmpVec);
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      }

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      VecDestroy(&tmpVec);
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      MatAssemblyBegin(matK, MAT_FINAL_ASSEMBLY);
      MatAssemblyEnd(matK, MAT_FINAL_ASSEMBLY);

      // Calculate: mat_schur_primal = A_PiPi - A_PiB inv(A_BB) ABPi
      //                             = A_PiPi - A_PiB matK
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      MatDuplicate(subdomain->getMatCoarse(), MAT_COPY_VALUES, 
		   &mat_schur_primal);
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      Mat matPrimal;
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      MatMatMult(subdomain->getMatCoarseInterior(), matK, MAT_INITIAL_MATRIX, 
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		 PETSC_DEFAULT, &matPrimal);
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      MatAXPY(mat_schur_primal, -1.0, matPrimal, DIFFERENT_NONZERO_PATTERN);
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      MatDestroy(&matPrimal);
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      MatDestroy(&matK);


      // === Create KSP solver object and set appropriate solver options. ====
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      KSPCreate(mpiCommGlobal, &ksp_schur_primal);
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      KSPSetOperators(ksp_schur_primal, mat_schur_primal, mat_schur_primal,
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		      SAME_NONZERO_PATTERN);
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      KSPSetOptionsPrefix(ksp_schur_primal, "schur_primal_");
      KSPSetType(ksp_schur_primal, KSPPREONLY);
      PC pc_schur_primal;      
      KSPGetPC(ksp_schur_primal, &pc_schur_primal);
      PCSetType(pc_schur_primal, PCLU);
      PCFactorSetMatSolverPackage(pc_schur_primal, MATSOLVERMUMPS);
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      KSPSetFromOptions(ksp_schur_primal);
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      // === And finally print timings, if required. ===

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      if (printTimings) {
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	MPI::COMM_WORLD.Barrier();
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	MatInfo minfo;
	MatGetInfo(mat_schur_primal, MAT_GLOBAL_SUM, &minfo);
	MSG("Schur primal matrix nnz = %f\n", minfo.nz_used);
	
	MSG("FETI-DP timing 06: %.5f seconds (creation of schur primal matrix)\n",
	    MPI::Wtime() - wtime);

	wtime = MPI::Wtime();
	KSPSetUp(ksp_schur_primal);
	KSPSetUpOnBlocks(ksp_schur_primal);
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	MPI::COMM_WORLD.Barrier();
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	MSG("FETI-DP timing 07: %.5f seconds (factorization of primal schur matrix).\n",
	    MPI::Wtime() - wtime);
      }
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    }
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  }


  void PetscSolverFeti::destroySchurPrimalKsp()
  {
    FUNCNAME("PetscSolverFeti::destroySchurPrimal()");

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    if (schurPrimalSolver == 0) {
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      if (augmentedLagrange == false) {
	schurPrimalData.subSolver = NULL;
	
	VecDestroy(&schurPrimalData.tmp_vec_b);
	VecDestroy(&schurPrimalData.tmp_vec_primal);
      } else {
	schurPrimalAugmentedData.subSolver = NULL;
	schurPrimalAugmentedData.mat_lagrange = NULL;
	schurPrimalAugmentedData.mat_augmented_lagrange = NULL;

	VecDestroy(&schurPrimalAugmentedData.tmp_vec_b0);
	VecDestroy(&schurPrimalAugmentedData.tmp_vec_b1);
	VecDestroy(&schurPrimalAugmentedData.tmp_vec_primal);
	VecDestroy(&schurPrimalAugmentedData.tmp_vec_lagrange);
      }
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    }
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    MatDestroy(&mat_schur_primal);
    KSPDestroy(&ksp_schur_primal);
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  }


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  void PetscSolverFeti::createFetiKsp(vector<const FiniteElemSpace*> &feSpaces)
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  {
    FUNCNAME("PetscSolverFeti::createFetiKsp()");

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    // === Create FETI-DP solver object. ===

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    fetiData.mat_lagrange = &mat_lagrange;
    fetiData.subSolver = subdomain;
    fetiData.ksp_schur_primal = &ksp_schur_primal;

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    localDofMap.createVec(fetiData.tmp_vec_b0, nGlobalOverallInterior);
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    lagrangeMap.createVec(fetiData.tmp_vec_lagrange);
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    primalDofMap.createVec(fetiData.tmp_vec_primal0);
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    if (stokesMode == false) {      
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      MatCreateShell(mpiCommGlobal,
		     lagrangeMap.getRankDofs(), 
		     lagrangeMap.getRankDofs(),
		     lagrangeMap.getOverallDofs(), 
		     lagrangeMap.getOverallDofs(),
		     &fetiData, &mat_feti);
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      if (augmentedLagrange == false) {
	MatShellSetOperation(mat_feti, MATOP_MULT, 
			     (void(*)(void))petscMultMatFeti);
      } else {
	fetiData.mat_augmented_lagrange = &mat_augmented_lagrange;
	primalDofMap.createVec(fetiData.tmp_vec_primal1);
	MatShellSetOperation(mat_feti, MATOP_MULT, 
			     (void(*)(void))petscMultMatFetiAugmented);	
      }
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    }  else {
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      TEST_EXIT_DBG(!augmentedLagrange)("Not yet implemented!\n");

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      localDofMap.createVec(fetiData.tmp_vec_b1, nGlobalOverallInterior);
      primalDofMap.createVec(fetiData.tmp_vec_primal1);
      interfaceDofMap.createVec(fetiData.tmp_vec_interface);

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      MatCreateShell(mpiCommGlobal,
		     interfaceDofMap.getRankDofs() + lagrangeMap.getRankDofs(), 
		     interfaceDofMap.getRankDofs() + lagrangeMap.getRankDofs(),
		     interfaceDofMap.getOverallDofs() + lagrangeMap.getOverallDofs(), 
		     interfaceDofMap.getOverallDofs() + lagrangeMap.getOverallDofs(),
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		     &fetiData, &mat_feti);
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      MatShellSetOperation(mat_feti, MATOP_MULT, 
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			   (void(*)(void))petscMultMatFetiInterface);      
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    }
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    KSPCreate(mpiCommGlobal, &ksp_feti);
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    KSPSetOperators(ksp_feti, mat_feti, mat_feti, SAME_NONZERO_PATTERN);
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    KSPSetOptionsPrefix(ksp_feti, "feti_");
    KSPSetType(ksp_feti, KSPGMRES);
    KSPSetTolerances(ksp_feti, 0, 1e-8, 1e+3, 1000);
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    KSPSetFromOptions(ksp_feti);
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    if (stokesMode)
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      KSPMonitorSet(ksp_feti, KSPMonitorFetiStokes, &fetiKspData, PETSC_NULL);
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    // === Create null space objects. ===
    
    createNullSpace();


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    switch (fetiPreconditioner) {
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    case FETI_DIRICHLET:
      TEST_EXIT(meshLevel == 0)
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	("Check for localDofMap.getLocalMatIndex, which should not work for multilevel FETI-DP!\n");

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      TEST_EXIT(!stokesMode)
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	("Stokes mode does not yet support the Dirichlet precondition!\n");

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      KSPCreate(PETSC_COMM_SELF, &ksp_interior);
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      KSPSetOperators(ksp_interior, mat_interior_interior, mat_interior_interior, 
		      SAME_NONZERO_PATTERN);