PetscSolverGlobalMatrix.cc 30.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/******************************************************************************
 *
 * AMDiS - Adaptive multidimensional simulations
 *
 * Copyright (C) 2013 Dresden University of Technology. All Rights Reserved.
 * Web: https://fusionforge.zih.tu-dresden.de/projects/amdis
 *
 * Authors: 
 * Simon Vey, Thomas Witkowski, Andreas Naumann, Simon Praetorius, et al.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *
 * This file is part of AMDiS
 *
 * See also license.opensource.txt in the distribution.
 * 
 ******************************************************************************/
Thomas Witkowski's avatar
Thomas Witkowski committed
20

21 22
#include <mpi.h>
#include "DirichletBC.h"
23
#include "DOFVector.h"
Thomas Witkowski's avatar
Thomas Witkowski committed
24 25 26
#include "parallel/PetscSolverGlobalMatrix.h"
#include "parallel/StdMpi.h"
#include "parallel/MpiHelper.h"
27
#include "solver/PetscTypes.h"
Thomas Witkowski's avatar
Thomas Witkowski committed
28

29
namespace AMDiS { namespace Parallel {
30 31 32 33 34 35

  PetscSolverGlobalMatrix::PetscSolverGlobalMatrix(string name)
    : PetscSolver(name),
      zeroStartVector(false),
      printMatInfo(false)
  {
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
    PetscParameters params;
    bool matSolverPackage = false;
    
    // set the solver
    std::string solverName = "petsc";
    Parameters::get(name, solverName);
    if (solverName == "petsc") 
      Parameters::get(name + "->ksp_type", solverName);
    
    std::string kspSolver = params.solverMap[solverName];
    
    if (params.matSolverPackage[kspSolver]) {
      // direct solvers
      PetscOptionsInsertString(("-" + kspPrefix + "ksp_type preonly").c_str());
      PetscOptionsInsertString(("-" + kspPrefix + "pc_type lu").c_str());
      PetscOptionsInsertString(("-" + kspPrefix + "pc_factor_mat_solver_package " + (kspSolver != "direct" ? kspSolver : "mumps")).c_str());
      setMaxIterations(1);
      zeroStartVector = true;
      matSolverPackage = true;
    } else if (!params.emptyParam[kspSolver]) {    
      // other solvers
      PetscOptionsInsertString(("-" + kspPrefix + "ksp_type " + kspSolver).c_str());
    }
    
    
    // set the preconditioner
    string precon = "";
    Parameters::get(name + "->pc_type", precon);
    if (!precon.size())
      Parameters::get(name + "->left precon", precon);
    if (!matSolverPackage && !params.emptyParam[precon]) {
      precon = (params.preconMap.find(precon) != params.preconMap.end() ? params.preconMap[precon] : precon);
      PetscOptionsInsertString(("-" + kspPrefix + "pc_type " + precon).c_str());
    }
    
    PetscOptionsInsertString(("-" + kspPrefix + "ksp_max_it " + boost::lexical_cast<std::string>(getMaxIterations())).c_str());
    PetscOptionsInsertString(("-" + kspPrefix + "ksp_rtol " + boost::lexical_cast<std::string>(getRelative())).c_str());    
    PetscOptionsInsertString(("-" + kspPrefix + "ksp_atol " + boost::lexical_cast<std::string>(getTolerance())).c_str());   
    
    if (getInfo() >= 20)
      PetscOptionsInsertString(("-" + kspPrefix + "ksp_monitor_true_residual").c_str());
    else if (getInfo() >= 10)
      PetscOptionsInsertString(("-" + kspPrefix + "ksp_monitor").c_str());
    
    if (!matSolverPackage) {
81
      Parameters::get(name + "->use zero start vector", zeroStartVector);
82
    }
83 84 85 86
    Parameters::get("parallel->print matrix info", printMatInfo);
  }


Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
87
  void PetscSolverGlobalMatrix::fillPetscMatrix(Matrix<DOFMatrix*> *seqMat)
Thomas Witkowski's avatar
Thomas Witkowski committed
88 89 90
  {
    FUNCNAME("PetscSolverGlobalMatrix::fillPetscMatrix()");

Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
91 92 93 94
    TEST_EXIT_DBG(meshDistributor)("No mesh distributor object defined!\n");
    TEST_EXIT_DBG(interiorMap)("No parallel mapping object defined!\n");
    TEST_EXIT_DBG(seqMat)("No DOF matrix defined!\n");
    
95
#if (DEBUG != 0)
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
96
    double wtime = MPI::Wtime();
97
#endif
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
98

99
    createMatVec(*seqMat);
100

Thomas Witkowski's avatar
Thomas Witkowski committed
101
    if (coarseSpaceMap.size()) {
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
102
      fillPetscMatrixWithCoarseSpace(seqMat);
103 104
      return;
    }
105
    
106 107
    // === Create PETSc vector (solution and a temporary vector). ===

Thomas Witkowski's avatar
Thomas Witkowski committed
108 109 110 111 112 113
#if (DEBUG != 0)
    MSG("Fill petsc matrix 1 needed %.5f seconds\n", MPI::Wtime() - wtime);
#endif

    // === Transfer values from DOF matrices to the PETSc matrix. === 

Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
114
    int nComponents = seqMat->getNumRows();
Thomas Witkowski's avatar
Thomas Witkowski committed
115 116
    for (int i = 0; i < nComponents; i++)
      for (int j = 0; j < nComponents; j++)
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
117 118
	if ((*seqMat)[i][j])
	  setDofMatrix((*seqMat)[i][j], i, j);
Thomas Witkowski's avatar
Thomas Witkowski committed
119 120 121 122 123

#if (DEBUG != 0)
    MSG("Fill petsc matrix 2 needed %.5f seconds\n", MPI::Wtime() - wtime);
#endif

124
    matAssembly();
125

126 127
    if (printMatInfo) {
      MatInfo matInfo;
128
      MatGetInfo(getMatInterior(), MAT_GLOBAL_SUM, &matInfo);
129 130 131 132 133 134 135
      MSG("Matrix info:\n");
      MSG("  memory usage: %e MB\n", matInfo.memory / (1024.0 * 1024.0));
      MSG("  mallocs: %d\n", static_cast<int>(matInfo.mallocs));
      MSG("  nz allocated: %d\n", static_cast<int>(matInfo.nz_allocated));
      MSG("  nz used: %d\n", static_cast<int>(matInfo.nz_used));
      MSG("  nz unneeded: %d\n", static_cast<int>(matInfo.nz_unneeded));
    }
136 137


138
    // === Init PETSc solver and preconditioner objects. ===
139

140 141
    initSolver(kspInterior);
    KSPGetPC(kspInterior, &pcInterior);
142
    initPreconditioner(pcInterior);
143

144

Thomas Witkowski's avatar
Thomas Witkowski committed
145 146 147
#if (DEBUG != 0)
    MSG("Fill petsc matrix 3 needed %.5f seconds\n", MPI::Wtime() - wtime);
#endif
148 149


150 151 152 153 154 155 156 157 158 159 160
    // === For debugging allow to write the matrix to a file. ===

    bool dbgWriteMatrix = false;
    Parameters::get("parallel->debug->write matrix", dbgWriteMatrix);
    if (dbgWriteMatrix) {
      PetscViewer matView;
      PetscViewerBinaryOpen(PETSC_COMM_WORLD, "mpi.mat",
			    FILE_MODE_WRITE, &matView);
      MatView(getMatInterior(), matView);
      PetscViewerDestroy(&matView);
    }
161 162 163
  }


Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
164
  void PetscSolverGlobalMatrix::fillPetscMatrixWithCoarseSpace(Matrix<DOFMatrix*> *seqMat)
165 166
  {
    FUNCNAME("PetscSolverGlobalMatrix::fillPetscMatrixWithCoarseSpace()");
167 168

    TEST_EXIT_DBG(interiorMap)("Should not happen!\n");
169 170
    TEST_EXIT_DBG(coarseSpaceMap.size() == seqMat->getSize())
      ("Wrong sizes %d %d\n", coarseSpaceMap.size(), seqMat->getSize());
171

172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187
    // === Prepare traverse of sequentially created matrices. ===

    using mtl::tag::row; using mtl::tag::nz; using mtl::begin; using mtl::end;
    namespace traits = mtl::traits;
    typedef DOFMatrix::base_matrix_type Matrix;

    typedef traits::range_generator<row, Matrix>::type cursor_type;
    typedef traits::range_generator<nz, cursor_type>::type icursor_type;

    vector<int> cols, colsOther;
    vector<double> values, valuesOther;
    cols.reserve(300);
    colsOther.reserve(300);
    values.reserve(300);
    valuesOther.reserve(300);

188 189 190
    bool localMatrix = 
      (meshDistributor->getMeshLevelData().getMpiComm(meshLevel) == MPI::COMM_SELF);

191 192 193
    // === Traverse all sequentially created matrices and add the values to ===
    // === the global PETSc matrices.                                       ===

Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
194
    int nComponents = seqMat->getSize();
Thomas Witkowski's avatar
Thomas Witkowski committed
195 196 197 198 199
    for (int rowComponent = 0; rowComponent < nComponents; rowComponent++) {
      for (int colComponent = 0; colComponent < nComponents; colComponent++) {
	DOFMatrix* dofMat = (*seqMat)[rowComponent][colComponent];

	if (!dofMat)
200 201
	  continue;

Thomas Witkowski's avatar
Thomas Witkowski committed
202 203
	ParallelDofMapping *rowCoarseSpace = coarseSpaceMap[rowComponent];
	ParallelDofMapping *colCoarseSpace = coarseSpaceMap[colComponent];
Thomas Witkowski's avatar
Thomas Witkowski committed
204

Thomas Witkowski's avatar
Thomas Witkowski committed
205 206
	std::set<DegreeOfFreedom> &dirichletRows = dofMat->getDirichletRows();

Thomas Witkowski's avatar
Thomas Witkowski committed
207 208
	traits::col<Matrix>::type col(dofMat->getBaseMatrix());
	traits::const_value<Matrix>::type value(dofMat->getBaseMatrix());
209 210
	
	// Traverse all rows.
Thomas Witkowski's avatar
Thomas Witkowski committed
211 212
	for (cursor_type cursor = begin<row>(dofMat->getBaseMatrix()), 
	       cend = end<row>(dofMat->getBaseMatrix()); cursor != cend; ++cursor) {
213

214
	  bool isRowCoarse = isCoarseSpace(rowComponent, cursor.value());
Thomas Witkowski's avatar
Thomas Witkowski committed
215 216 217

	  // For the case, this is a dirichlet row we have to check whether the 
	  // rank is also owner of this row DOF.
218 219 220
	  if (dirichletRows.count(cursor.value())) {
	    if ((!isRowCoarse && !(*interiorMap)[rowComponent].isRankDof(cursor.value())) ||
		(isRowCoarse && !(*rowCoarseSpace)[rowComponent].isRankDof(cursor.value())))
221
	      continue;    
Thomas Witkowski's avatar
Thomas Witkowski committed
222
	  }
223 224 225 226 227 228 229 230 231 232
  
	  cols.clear();
	  colsOther.clear();
	  values.clear();	  
	  valuesOther.clear();

	  // Traverse all columns.
	  for (icursor_type icursor = begin<nz>(cursor), icend = end<nz>(cursor); 
	       icursor != icend; ++icursor) {

Thomas Witkowski's avatar
Thomas Witkowski committed
233
	    bool isColCoarse = isCoarseSpace(colComponent, col(*icursor));
234

Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
235
	    if (isColCoarse == false)
236
	      if ((*interiorMap)[colComponent].isSet(col(*icursor)) == false)
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
237 238
		continue;

Thomas Witkowski's avatar
Thomas Witkowski committed
239 240 241
	    if (isColCoarse == isRowCoarse) {
	      cols.push_back(col(*icursor));
	      values.push_back(value(*icursor));
242
	    } else {
Thomas Witkowski's avatar
Thomas Witkowski committed
243 244
	      colsOther.push_back(col(*icursor));
	      valuesOther.push_back(value(*icursor));
245 246 247 248 249 250
	    }
	  }  // for each nnz in row


	  // === Set matrix values. ===

Thomas Witkowski's avatar
Thomas Witkowski committed
251
	  if (isRowCoarse) {
Thomas Witkowski's avatar
Thomas Witkowski committed
252 253
	    for (unsigned int i = 0; i < cols.size(); i++)
	      cols[i] = colCoarseSpace->getMatIndex(colComponent, cols[i]);
254

255
	    int rowIndex = rowCoarseSpace->getMatIndex(rowComponent, cursor.value());
Thomas Witkowski's avatar
Thomas Witkowski committed
256
	    MatSetValues(getMatCoarseByComponent(rowComponent, colComponent),
257 258
	    		 1, &rowIndex, cols.size(),
	    		 &(cols[0]), &(values[0]), ADD_VALUES);
259 260

	    if (colsOther.size()) {
Thomas Witkowski's avatar
Thomas Witkowski committed
261 262 263
	      for (unsigned int i = 0; i < colsOther.size(); i++)
		colsOther[i] = 
		  interiorMap->getMatIndex(colComponent, colsOther[i]) + 
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
264
		  rStartInterior;	      
265

Thomas Witkowski's avatar
Thomas Witkowski committed
266
	      MatSetValues(getMatCoarseInteriorByComponent(rowComponent), 
267 268
	       		   1, &rowIndex, colsOther.size(),
 	       		   &(colsOther[0]), &(valuesOther[0]), ADD_VALUES);
269 270
	    }
	  } else {
271
	    if ((*interiorMap)[rowComponent].isSet(cursor.value()) == false)
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
272 273
	      continue;

274
	    int localRowIndex = 
275
	      (localMatrix ? 
276 277
	       interiorMap->getLocalMatIndex(rowComponent, cursor.value()) :
	       interiorMap->getMatIndex(rowComponent, cursor.value()));
278

Thomas Witkowski's avatar
Thomas Witkowski committed
279
	    for (unsigned int i = 0; i < cols.size(); i++) {
280
	      if (localMatrix)
Thomas Witkowski's avatar
Thomas Witkowski committed
281
		cols[i] = interiorMap->getLocalMatIndex(colComponent, cols[i]);
282
	      else
Thomas Witkowski's avatar
Thomas Witkowski committed
283
		cols[i] = interiorMap->getMatIndex(colComponent, cols[i]);
284 285
	    }
	    
286 287
	    MatSetValues(getMatInterior(), 1, &localRowIndex, cols.size(),
  	     		 &(cols[0]), &(values[0]), ADD_VALUES);
Thomas Witkowski's avatar
Thomas Witkowski committed
288
	    
289
	    if (colsOther.size()) {
Thomas Witkowski's avatar
Thomas Witkowski committed
290
	      int globalRowIndex = 
291
		interiorMap->getMatIndex(rowComponent, cursor.value()) + rStartInterior;
Thomas Witkowski's avatar
Thomas Witkowski committed
292
      
Thomas Witkowski's avatar
Thomas Witkowski committed
293 294 295
	      for (unsigned int i = 0; i < colsOther.size(); i++)
		colsOther[i] = 
		  colCoarseSpace->getMatIndex(colComponent, colsOther[i]);
296

297 298 299
	      MatSetValues(getMatInteriorCoarseByComponent(colComponent), 
			   1, &globalRowIndex, colsOther.size(),
			   &(colsOther[0]), &(valuesOther[0]), ADD_VALUES);
300 301 302 303 304 305
	    }
	  }
	} 
      }
    }

306
    matAssembly();
307

308 309
    // === Create solver for the non primal (thus local) variables. ===

310
    KSPCreate(domainComm, &kspInterior);
311
    KSPSetOperators(kspInterior, getMatInterior(), getMatInterior(),
312
		    SAME_NONZERO_PATTERN);
313 314 315
    KSPSetOptionsPrefix(kspInterior, "interior_");
    KSPSetType(kspInterior, KSPPREONLY);
    KSPGetPC(kspInterior, &pcInterior);
316 317
    if (isSymmetric) {
      PCSetType(pcInterior, PCCHOLESKY);
318
      PCFactorSetMatSolverPackage(pcInterior, MATSOLVERMUMPS);
319 320
    } else {
      PCSetType(pcInterior, PCLU);
321
      if (localMatrix)
322 323 324 325
	PCFactorSetMatSolverPackage(pcInterior, MATSOLVERUMFPACK);
      else
	PCFactorSetMatSolverPackage(pcInterior, MATSOLVERMUMPS);
    }
326
    KSPSetFromOptions(kspInterior);
327 328 329
  }


330 331 332
  void PetscSolverGlobalMatrix::fillPetscRhs(SystemVector *vec)
  {
    FUNCNAME("PetscSolverGlobalMatrix::fillPetscRhs()");
Thomas Witkowski's avatar
Thomas Witkowski committed
333

334
    TEST_EXIT_DBG(vec)("No DOF vector defined!\n");
335
    TEST_EXIT_DBG(interiorMap)("No parallel DOF map defined!\n");
Thomas Witkowski's avatar
Thomas Witkowski committed
336
    
Thomas Witkowski's avatar
Thomas Witkowski committed
337
    // === Transfer values from DOF vector to the PETSc vector. === 
Thomas Witkowski's avatar
Thomas Witkowski committed
338
    if (coarseSpaceMap.size()) {
Thomas Witkowski's avatar
Thomas Witkowski committed
339
      for (int i = 0; i < vec->getSize(); i++)
340
	setDofVector(getVecRhsInterior(), 
Thomas Witkowski's avatar
Thomas Witkowski committed
341
		     getVecRhsCoarseByComponent(i), vec->getDOFVector(i), i);
Thomas Witkowski's avatar
Thomas Witkowski committed
342 343
    } else {
      for (int i = 0; i < vec->getSize(); i++)
344
	setDofVector(getVecRhsInterior(), vec->getDOFVector(i), i);
Thomas Witkowski's avatar
Thomas Witkowski committed
345 346
    }

347
    vecRhsAssembly();
348 349 350 351 352 353 354 355 356 357 358 359

    // === For debugging allow to write the rhs vector to a file. ===

    bool dbgWriteRhs = false;
    Parameters::get("parallel->debug->write rhs", dbgWriteRhs);
    if (dbgWriteRhs) {
      PetscViewer vecView;
      PetscViewerBinaryOpen(PETSC_COMM_WORLD, "mpi.vec",
			    FILE_MODE_WRITE, &vecView);
      VecView(getVecRhsInterior(), vecView);
      PetscViewerDestroy(&vecView);
    }
Thomas Witkowski's avatar
Thomas Witkowski committed
360 361 362
  }


363 364
  void PetscSolverGlobalMatrix::solvePetscMatrix(SystemVector &vec, 
						 AdaptInfo *adaptInfo)
Thomas Witkowski's avatar
Thomas Witkowski committed
365 366 367 368 369 370 371
  {
    FUNCNAME("PetscSolverGlobalMatrix::solvePetscMatrix()");

    int nComponents = vec.getSize();

    // === Set old solution to be initiual guess for PETSc solver. ===
    if (!zeroStartVector) {
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
372 373
      TEST_EXIT(coarseSpaceMap.size() == 0)("Not yet supported!\n");

374
      VecSet(getVecSolInterior(), 0.0);
Thomas Witkowski's avatar
Thomas Witkowski committed
375 376
      
      for (int i = 0; i < nComponents; i++)
377
	setDofVector(getVecSolInterior(), vec.getDOFVector(i), i, true);
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
378

379
      vecSolAssembly();
Thomas Witkowski's avatar
Thomas Witkowski committed
380 381
    }

382

Thomas Witkowski's avatar
Thomas Witkowski committed
383 384
    MatNullSpace matNullspace;
    Vec nullspaceBasis;
385 386 387
    if (nullspace.size() > 0 || 
	hasConstantNullspace ||
	constNullspaceComponent.size() > 0) {
Thomas Witkowski's avatar
Thomas Witkowski committed
388
      TEST_EXIT_DBG(nullspace.size() <= 1)("Not yet implemented!\n");
389

390 391 392 393 394 395 396 397 398 399
      if (constNullspaceComponent.size() > 0) {
	nullspace.clear();
	SystemVector *basisVec = new SystemVector(vec);
	basisVec->set(0.0);
	for (unsigned int i = 0; i < constNullspaceComponent.size(); i++)
	  basisVec->getDOFVector(constNullspaceComponent[i])->set(1.0);

	nullspace.push_back(basisVec);
      } 

Thomas Witkowski's avatar
Thomas Witkowski committed
400
      if (nullspace.size() > 0) {
401
	VecDuplicate(getVecSolInterior(), &nullspaceBasis);
402
	setDofVector(nullspaceBasis, *(nullspace[0]), true);
Thomas Witkowski's avatar
Thomas Witkowski committed
403 404 405
	
	VecAssemblyBegin(nullspaceBasis);
	VecAssemblyEnd(nullspaceBasis);
406 407

	VecNormalize(nullspaceBasis, PETSC_NULL);
Thomas Witkowski's avatar
Thomas Witkowski committed
408
	
409
	MatNullSpaceCreate(domainComm, (hasConstantNullspace ? PETSC_TRUE : PETSC_FALSE), 
Thomas Witkowski's avatar
Thomas Witkowski committed
410 411
			   1, &nullspaceBasis, &matNullspace);

412
	MatMult(getMatInterior(), nullspaceBasis, getVecSolInterior());
Thomas Witkowski's avatar
Thomas Witkowski committed
413
	PetscReal n;
414
	VecNorm(getVecSolInterior(), NORM_2, &n);
Thomas Witkowski's avatar
Thomas Witkowski committed
415 416
	MSG("NORM IS: %e\n", n);
      } else {
417
	MatNullSpaceCreate(domainComm, PETSC_TRUE, 0, PETSC_NULL, &matNullspace);
Thomas Witkowski's avatar
Thomas Witkowski committed
418
      }
419

Thomas Witkowski's avatar
Thomas Witkowski committed
420 421 422
      MSG("NULLSPACE IS NOT REMOVED!\n");
      // MatSetNullSpace(getMatInterior(), matNullspace);
      // KSPSetNullSpace(kspInterior, matNullspace);
423

Thomas Witkowski's avatar
Thomas Witkowski committed
424
      // === Remove null space, if requested. ===
425

Thomas Witkowski's avatar
Thomas Witkowski committed
426
      if (removeRhsNullspace) {
Thomas Witkowski's avatar
Thomas Witkowski committed
427
	TEST_EXIT_DBG(coarseSpaceMap.empty())("Not supported!\n");
428 429

	MSG("Remove nullspace from rhs vector.\n");
Thomas Witkowski's avatar
Thomas Witkowski committed
430
	
431
	MatNullSpaceRemove(matNullspace, getVecRhsInterior(), PETSC_NULL);
Thomas Witkowski's avatar
Thomas Witkowski committed
432 433 434 435
      }
    } else {
      TEST_EXIT(removeRhsNullspace == false)
	("No nullspace provided that should be removed from rhs!\n");
436 437
    }

Thomas Witkowski's avatar
Thomas Witkowski committed
438
    // PETSc.
439
    solve(getVecRhsInterior(), getVecSolInterior());
Thomas Witkowski's avatar
Thomas Witkowski committed
440

441 442

    if (nullspace.size() > 0) {
Thomas Witkowski's avatar
Thomas Witkowski committed
443
      MatNullSpaceDestroy(&matNullspace);
444 445 446 447
      VecDestroy(&nullspaceBasis);
    }


Thomas Witkowski's avatar
Thomas Witkowski committed
448 449
    // === Transfere values from PETSc's solution vectors to the DOF vectors. ===
    PetscScalar *vecPointer;
450
    VecGetArray(getVecSolInterior(), &vecPointer);    
Thomas Witkowski's avatar
Thomas Witkowski committed
451

452
    int c = 0;
453 454
    for (int component = 0; component < nComponents; component++) {
      DOFVector<double> &dv = *(vec.getDOFVector(component));
455

456
      DofMap& d = (*interiorMap)[component].getMap();
457 458 459
      for (DofMap::iterator it = d.begin(); it != d.end(); ++it)
	if (it->second.local != -1)
	  dv[it->first] = vecPointer[c++];
Thomas Witkowski's avatar
Thomas Witkowski committed
460 461
    }

462
    VecRestoreArray(getVecSolInterior(), &vecPointer);
Thomas Witkowski's avatar
Thomas Witkowski committed
463 464 465 466

    // === Synchronize DOFs at common DOFs, i.e., DOFs that correspond to ===  
    // === more than one partition.                                       ===  
    meshDistributor->synchVector(vec);
467 468 469
  }


470 471 472 473 474
  void PetscSolverGlobalMatrix::solveGlobal(Vec &rhs, Vec &sol)
  {
    FUNCNAME("PetscSolverGlobalMatrix::solveGlobal()");

    Vec tmp;
475
    if (domainComm.Get_size() == 1)
476
      createLocalVec(*interiorMap, tmp);
477
    else
478
      createVec(*interiorMap, tmp);
479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504

    PetscScalar *tmpValues, *rhsValues;
    VecGetArray(tmp, &tmpValues);
    VecGetArray(rhs, &rhsValues);

    for (int i = 0; i < interiorMap->getRankDofs(); i++)
      tmpValues[i] = rhsValues[i];

    VecRestoreArray(rhs, &rhsValues);
    VecRestoreArray(tmp, &tmpValues);

    KSPSolve(kspInterior, tmp, tmp);

    VecGetArray(tmp, &tmpValues);
    VecGetArray(sol, &rhsValues);

    for (int i = 0; i < interiorMap->getRankDofs(); i++) 
      rhsValues[i] = tmpValues[i];

    VecRestoreArray(sol, &rhsValues);
    VecRestoreArray(tmp, &tmpValues);

    VecDestroy(&tmp);
  }


505 506 507 508
  void PetscSolverGlobalMatrix::destroyMatrixData()
  {
    FUNCNAME("PetscSolverGlobalMatrix::destroyMatrixData()");

509
    matDestroy();
Thomas Witkowski's avatar
Thomas Witkowski committed
510

511 512 513
    exitPreconditioner(pcInterior);

    exitSolver(kspInterior);
Thomas Witkowski's avatar
Thomas Witkowski committed
514 515 516
  }


517 518 519 520
  void PetscSolverGlobalMatrix::destroyVectorData()
  {
    FUNCNAME("PetscSolverGlobalMatrix::destroyVectorData()");

521
    vecDestroy();
522 523 524
  }


525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543
  void PetscSolverGlobalMatrix::createFieldSplit(PC pc)
  {
    FUNCNAME("PetscSolverGlobalMatrix::createFieldSplit()");

    vector<string> isNames;
    Parameters::get("parallel->solver->is blocks", isNames);

    int nBlocks = isNames.size();
    if (nBlocks == 0)
      return;

    for (int i = 0; i < nBlocks; i++) {
      MSG("Create for block %s\n", isNames[i].c_str());

      vector<int> blockComponents;
      Parameters::get("parallel->solver->is block " + lexical_cast<string>(i),
		      blockComponents);
      int nComponents = static_cast<int>(blockComponents.size());

544
      TEST_EXIT(nComponents > 0)("No IS block for block %d defined!\n", i);
545 546 547 548 549 550 551 552

      // Check if blocks are continous
      for (int j = 0; j < nComponents; j++) {
	TEST_EXIT(blockComponents[j] == blockComponents[0] + j)
	  ("Does not yet support not continous IS blocks! Block %s\n", 
	   isNames[i].c_str());
      }

553
      createFieldSplit(pc, isNames[i].c_str(), blockComponents);
554 555 556 557
    }
  }


558
  void PetscSolverGlobalMatrix::createFieldSplit(PC pc, 
559
						 const char* splitName, 
560 561 562 563 564 565
						 vector<int> &components)
  {
    FUNCNAME("PetscSolverGlobalMatrix::createFieldSplit()");

    IS is;
    interiorMap->createIndexSet(is, components[0], components.size());
566
    PCFieldSplitSetIS(pc, splitName, is);
567 568
    ISDestroy(&is);
  }
569 570 571 572 573 574 575 576 577 578
  
  
  void PetscSolverGlobalMatrix::extractVectorComponent(Vec input, int i, Vec *output, int numberOfComponents)
  {
    FUNCNAME("PetscSolverGlobalMatrix::extractVectorComponent()");
    IS is;
    interiorMap->createIndexSet(is, i, numberOfComponents);
    VecGetSubVector(input, is, output);
    ISDestroy(&is);
  }
579

580 581 582 583 584 585 586 587 588 589 590
  void PetscSolverGlobalMatrix::extractMatrixComponent(Mat input, int startRow, int numberOfRows, int startCol, int numberOfCols, Mat *output)
  {
    FUNCNAME("PetscSolverGlobalMatrix::extractMatrixComponent()");
    IS isrow, iscol;
    interiorMap->createIndexSet(isrow, startRow, numberOfRows);
    interiorMap->createIndexSet(iscol, startCol, numberOfCols);
    MatGetSubMatrix(input, isrow, iscol, MAT_INITIAL_MATRIX, output);
    ISDestroy(&iscol);
    ISDestroy(&isrow);
  }
  
591

592
  void PetscSolverGlobalMatrix::initSolver(KSP &ksp)
593 594 595
  {
    FUNCNAME("PetscSolverGlobalMatrix::initSolver()");

596
    KSPCreate(domainComm, &ksp);
597 598 599 600 601
    KSPSetOperators(ksp, getMatInterior(), getMatInterior(), 
		    SAME_NONZERO_PATTERN); 
    KSPSetTolerances(ksp, 0.0, 1e-8, PETSC_DEFAULT, PETSC_DEFAULT);
    KSPSetType(ksp, KSPBCGS);
    KSPSetOptionsPrefix(ksp, kspPrefix.c_str());
602
    MatSetOptionsPrefix(getMatInterior(), kspPrefix.c_str());
603 604 605 606 607 608 609 610
    KSPSetFromOptions(ksp);

    // Do not delete the solution vector, use it for the initial guess.
    if (!zeroStartVector)
      KSPSetInitialGuessNonzero(ksp, PETSC_TRUE);
  }  


611
  void PetscSolverGlobalMatrix::exitSolver(KSP &ksp)
612 613 614 615 616 617 618
  {
    FUNCNAME("PetscSolverGlobalMatrix::exitSolver()");

    KSPDestroy(&ksp);
  }  


619 620 621 622 623 624 625 626 627 628 629 630 631 632 633
  void PetscSolverGlobalMatrix::initPreconditioner(PC pc)
  {
    FUNCNAME("PetscSolverGlobalMatrix::initPreconditioner()");

    PCSetFromOptions(pc);
    createFieldSplit(pc);
  }

 
  void PetscSolverGlobalMatrix::exitPreconditioner(PC pc)
  {
    FUNCNAME("PetscSolverGlobalMatrix::exitPreconditioner()");
  }


Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
634
  void PetscSolverGlobalMatrix::setDofMatrix(DOFMatrix* seqMat,
Thomas Witkowski's avatar
Thomas Witkowski committed
635
					     int rowComp, int colComp)
Thomas Witkowski's avatar
Thomas Witkowski committed
636 637 638
  {
    FUNCNAME("PetscSolverGlobalMatrix::setDofMatrix()");

Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
639
    TEST_EXIT(seqMat)("No DOFMatrix!\n");
Thomas Witkowski's avatar
Thomas Witkowski committed
640 641

    using mtl::tag::row; using mtl::tag::nz; using mtl::begin; using mtl::end;
642
    namespace traits = mtl::traits;
Thomas Witkowski's avatar
Thomas Witkowski committed
643 644
    typedef DOFMatrix::base_matrix_type Matrix;

Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
645 646
    traits::col<Matrix>::type col(seqMat->getBaseMatrix());
    traits::const_value<Matrix>::type value(seqMat->getBaseMatrix());
Thomas Witkowski's avatar
Thomas Witkowski committed
647 648 649 650 651 652 653 654 655 656 657

    typedef traits::range_generator<row, Matrix>::type cursor_type;
    typedef traits::range_generator<nz, cursor_type>::type icursor_type;

    vector<int> cols;
    vector<double> values;
    cols.reserve(300);
    values.reserve(300);
    
    vector<int> globalCols;

658 659
    // Get periodic mapping object
    PeriodicMap &perMap = meshDistributor->getPeriodicMap();
Thomas Witkowski's avatar
Thomas Witkowski committed
660 661
    std::set<DegreeOfFreedom> &dirichletRows = seqMat->getDirichletRows();
      
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
662 663
    const FiniteElemSpace *rowFe = seqMat->getRowFeSpace();
    const FiniteElemSpace *colFe = seqMat->getColFeSpace();
Thomas Witkowski's avatar
Thomas Witkowski committed
664 665

    // === Traverse all rows of the DOF matrix and insert row wise the values ===
Thomas Witkowski's avatar
Thomas Witkowski committed
666 667
    // === to the PETSc matrix.                                               ===

Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
668 669
    for (cursor_type cursor = begin<row>(seqMat->getBaseMatrix()), 
	   cend = end<row>(seqMat->getBaseMatrix()); cursor != cend; ++cursor) {
Thomas Witkowski's avatar
Thomas Witkowski committed
670
      // Global index of the current row DOF.
671
      MultiIndex rowMultiIndex;
672
      if ((*interiorMap)[rowComp].find(cursor.value(), rowMultiIndex) == false)
673 674 675
	continue;

      int globalRowDof = rowMultiIndex.global;
676

Thomas Witkowski's avatar
Thomas Witkowski committed
677
      // Test if the current row DOF is a periodic DOF.
678
      bool periodicRow = perMap.isPeriodic(rowFe, globalRowDof);
679

Thomas Witkowski's avatar
Thomas Witkowski committed
680
      // Dirichlet rows can be set only be the owner ranks.
681
      if (dirichletRows.count(cursor.value()) && !((*interiorMap)[rowComp].isRankDof(cursor.value())))
Thomas Witkowski's avatar
Thomas Witkowski committed
682 683
	continue;

Thomas Witkowski's avatar
Thomas Witkowski committed
684 685 686
      if (!periodicRow) {
	// === Row DOF index is not periodic. ===

687
	// Get PETSc's mat row index.
Thomas Witkowski's avatar
Thomas Witkowski committed
688
	int rowIndex = interiorMap->getMatIndex(rowComp, globalRowDof);
Thomas Witkowski's avatar
Thomas Witkowski committed
689 690 691 692 693 694 695 696

	cols.clear();
	values.clear();

	for (icursor_type icursor = begin<nz>(cursor), icend = end<nz>(cursor); 
	     icursor != icend; ++icursor) {

	  // Global index of the current column index.
697
	  MultiIndex colMultiIndex;
Thomas Witkowski's avatar
Thomas Witkowski committed
698
	  if ((*interiorMap)[colComp].find(col(*icursor), colMultiIndex) == false)
699 700 701
	    continue;

	  int globalColDof = colMultiIndex.global;
Thomas Witkowski's avatar
Thomas Witkowski committed
702
	  // Test if the current col dof is a periodic dof.
703
	  bool periodicCol = perMap.isPeriodic(colFe, globalColDof);
704
	  // Get PETSc's mat col index.
Thomas Witkowski's avatar
Thomas Witkowski committed
705
	  int colIndex = interiorMap->getMatIndex(colComp, globalColDof);
Thomas Witkowski's avatar
Thomas Witkowski committed
706 707 708 709 710 711 712

	  // Ignore all zero entries, expect it is a diagonal entry.
 	  if (value(*icursor) == 0.0 && rowIndex != colIndex)
 	    continue;

	  if (!periodicCol) {
	    // Calculate the exact position of the column index in the PETSc matrix.
Thomas Witkowski's avatar
Thomas Witkowski committed
713 714
 	    cols.push_back(colIndex);
 	    values.push_back(value(*icursor));
Thomas Witkowski's avatar
Thomas Witkowski committed
715 716 717 718 719
	  } else {
	    // === Row index is not periodic, but column index is. ===

	    // Create set of all periodic associations of the column index.
	    std::set<int> perAsc;
720 721 722
	    perMap.fillAssociations(colFe, globalColDof, 
				    meshDistributor->getElementObjectDb(), perAsc);

Thomas Witkowski's avatar
Thomas Witkowski committed
723 724 725 726 727 728 729 730 731
	    // Scale value to the number of periodic associations of the column index.
	    double scaledValue = 
	      value(*icursor) * pow(0.5, static_cast<double>(perAsc.size()));

	    
	    // === Create set of all matrix column indices due to the periodic ===
	    // === associations of the column DOF index.                       ===

	    vector<int> newCols;
732
	    perMap.mapDof(colFe, globalColDof, perAsc, newCols);
Thomas Witkowski's avatar
Thomas Witkowski committed
733
	    for (unsigned int i = 0; i < newCols.size(); i++) {
Thomas Witkowski's avatar
Thomas Witkowski committed
734
	      cols.push_back(interiorMap->getMatIndex(colComp, newCols[i]));
Thomas Witkowski's avatar
Thomas Witkowski committed
735 736 737 738 739
	      values.push_back(scaledValue);	      
	    }
	  }
	}

740
  	MatSetValues(getMatInterior(), 1, &rowIndex, cols.size(), 
Thomas Witkowski's avatar
Thomas Witkowski committed
741
  		     &(cols[0]), &(values[0]), ADD_VALUES);	
Thomas Witkowski's avatar
Thomas Witkowski committed
742 743 744 745 746 747 748 749 750 751 752 753 754 755
      } else {
	// === Row DOF index is periodic. ===

	// Because this row is periodic, we will have to add the entries of this 
	// matrix row to multiple rows. The following maps store to each row an
	// array of column indices and values of the entries that must be added to
	// the PETSc matrix.
	map<int, vector<int> > colsMap;
	map<int, vector<double> > valsMap;

	// Traverse all column entries.
	for (icursor_type icursor = begin<nz>(cursor), icend = end<nz>(cursor); 
	     icursor != icend; ++icursor) {
	  // Global index of the current column index.
Thomas Witkowski's avatar
Thomas Witkowski committed
756
	  int globalColDof = (*interiorMap)[colComp][col(*icursor)].global;
Thomas Witkowski's avatar
Thomas Witkowski committed
757 758 759 760 761 762 763 764 765

	  // Ignore all zero entries, expect it is a diagonal entry.
 	  if (value(*icursor) == 0.0 && globalRowDof != globalColDof)
 	    continue;

	  // === Add all periodic associations of both, the row and the column ===
	  // === indices to the set perAsc.                                    ===

	  std::set<int> perAsc;
766 767 768 769
	  perMap.fillAssociations(colFe, globalColDof, 
				  meshDistributor->getElementObjectDb(), perAsc);
	  perMap.fillAssociations(rowFe, globalRowDof, 
				  meshDistributor->getElementObjectDb(), perAsc);
Thomas Witkowski's avatar
Thomas Witkowski committed
770 771 772 773 774 775 776 777 778 779

	  // Scale the value with respect to the number of periodic associations.
	  double scaledValue = 
	    value(*icursor) * pow(0.5, static_cast<double>(perAsc.size()));


	  // === Create all matrix entries with respect to the periodic  ===
	  // === associations of the row and column indices.             ===

	  vector<pair<int, int> > entry;
Thomas Witkowski's avatar
Blbu  
Thomas Witkowski committed
780 781
	  perMap.mapDof(rowFe, colFe, make_pair(globalRowDof, globalColDof),
			perAsc, entry);
Thomas Witkowski's avatar
Thomas Witkowski committed
782 783 784

	  // === Translate the matrix entries to PETSc's matrix.

785
	  for (unsigned int i = 0; i < entry.size(); i++) {
Thomas Witkowski's avatar
Thomas Witkowski committed
786 787
	    int rowIdx = interiorMap->getMatIndex(rowComp, entry[i].first);
	    int colIdx = interiorMap->getMatIndex(colComp, entry[i].second);
Thomas Witkowski's avatar
Thomas Witkowski committed
788

789 790
	    colsMap[rowIdx].push_back(colIdx);
	    valsMap[rowIdx].push_back(scaledValue);
Thomas Witkowski's avatar
Thomas Witkowski committed
791 792 793 794 795 796 797 798 799 800 801 802
	  }
	}


	// === Finally, add all periodic rows to the PETSc matrix. ===

	for (map<int, vector<int> >::iterator rowIt = colsMap.begin();
	     rowIt != colsMap.end(); ++rowIt) {
	  TEST_EXIT_DBG(rowIt->second.size() == valsMap[rowIt->first].size())
	    ("Should not happen!\n");

	  int rowIndex = rowIt->first;
803

804
	  MatSetValues(getMatInterior(), 1, &rowIndex, rowIt->second.size(),
Thomas Witkowski's avatar
Thomas Witkowski committed
805 806 807 808 809 810 811
		       &(rowIt->second[0]), &(valsMap[rowIt->first][0]), ADD_VALUES);
	}
      }
    }
  }


Thomas Witkowski's avatar
Thomas Witkowski committed
812 813
  void PetscSolverGlobalMatrix::setDofVector(Vec vecInterior, 
					     Vec vecCoarse,
814
					     DOFVector<double>* vec, 
Thomas Witkowski's avatar
Thomas Witkowski committed
815
					     int rowComp, 
816
					     bool rankOnly)
Thomas Witkowski's avatar
Thomas Witkowski committed
817 818 819
  {
    FUNCNAME("PetscSolverGlobalMatrix::setDofVector()");

820
    const FiniteElemSpace *feSpace = vec->getFeSpace();
821
    PeriodicMap &perMap = meshDistributor->getPeriodicMap();
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
822

823
    ParallelDofMapping *rowCoarseSpace = 
Thomas Witkowski's avatar
Thomas Witkowski committed
824 825 826
      (coarseSpaceMap.size() ? coarseSpaceMap[rowComp] : NULL);

    map<DegreeOfFreedom, double> &dirichletValues = vec->getDirichletValues();
827

Thomas Witkowski's avatar
Thomas Witkowski committed
828 829 830
    // Traverse all used DOFs in the dof vector.
    DOFVector<double>::Iterator dofIt(vec, USED_DOFS);
    for (dofIt.reset(); !dofIt.end(); ++dofIt) {
Thomas Witkowski's avatar
Thomas Witkowski committed
831 832
      
      DegreeOfFreedom dof = dofIt.getDOFIndex();
833

Thomas Witkowski's avatar
Thomas Witkowski committed
834 835
      if (rankOnly && !(*interiorMap)[rowComp].isRankDof(dof))
	continue;
836

837 838
      bool isCoarseDof = isCoarseSpace(rowComp, dof);

Thomas Witkowski's avatar
Thomas Witkowski committed
839
      // Dirichlet rows can be set only be the owner ranks.
840 841 842 843 844
      if (dirichletValues.count(dof)) {
	if ((!isCoarseDof && !((*interiorMap)[rowComp].isRankDof(dof))) ||
	    (isCoarseDof && !((*rowCoarseSpace)[rowComp].isRankDof(dof))))
	  continue;
      }
Thomas Witkowski's avatar
Thomas Witkowski committed
845

846
      if (isCoarseDof) {
847 848
	TEST_EXIT_DBG(vecCoarse != PETSC_NULL)("Should not happen!\n");

Thomas Witkowski's avatar
Thomas Witkowski committed
849
	int index = rowCoarseSpace->getMatIndex(rowComp, dof);
850 851
	VecSetValue(vecCoarse, index, *dofIt, ADD_VALUES);
      } else {
Thomas Witkowski's avatar
Thomas Witkowski committed
852
	if ((*interiorMap)[rowComp].isSet(dof) == false)
Thomas Witkowski's avatar
Blub  
Thomas Witkowski committed
853 854
	  continue;

855
	// Calculate global row index of the DOF.
Thomas Witkowski's avatar
Thomas Witkowski committed
856
	DegreeOfFreedom globalRowDof = (*interiorMap)[rowComp][dof].global;
857 858 859 860 861
	
	// Get PETSc's mat index of the row DOF.
	int index = 0;
	if (interiorMap->isMatIndexFromGlobal())
	  index = 
Thomas Witkowski's avatar
Thomas Witkowski committed
862
	    interiorMap->getMatIndex(rowComp, globalRowDof) + rStartInterior;
863 864
	else
	  index =
Thomas Witkowski's avatar
Thomas Witkowski committed
865
	    interiorMap->getMatIndex(rowComp, dof) + rStartInterior;
866

867
	if (perMap.isPeriodic(feSpace, globalRowDof)) {
Thomas Witkowski's avatar
Thomas Witkowski committed
868 869 870
	  std::set<int>& perAsc = perMap.getAssociations(feSpace, globalRowDof);
	  double value = *dofIt / (perAsc.size() + 1.0);
	  VecSetValue(vecInterior, index, value, ADD_VALUES);
871

Thomas Witkowski's avatar
Thomas Witkowski committed
872 873 874
	  for (std::set<int>::iterator perIt = perAsc.begin(); 
	       perIt != perAsc.end(); ++perIt) {
	    int mappedDof = perMap.map(feSpace, *perIt, globalRowDof);
Thomas Witkowski's avatar
Thomas Witkowski committed
875
	    int mappedIndex = interiorMap->getMatIndex(rowComp, mappedDof);
876

Thomas Witkowski's avatar
Thomas Witkowski committed
877
	    VecSetValue(vecInterior, mappedIndex, value, ADD_VALUES);
878 879 880
	  }	  
	} else {	  
	  // The DOF index is not periodic.
Thomas Witkowski's avatar
Thomas Witkowski committed
881 882
	  VecSetValue(vecInterior, index, *dofIt, ADD_VALUES);
	}
Thomas Witkowski's avatar
Thomas Witkowski committed
883 884 885 886
      }
    }
  }

887 888 889 890 891 892 893 894 895 896

  PetscSolver* PetscSolverGlobalMatrix::createSubSolver(int component,
							string kspPrefix)
  {
    FUNCNAME("PetscSolverGlobalMatrix::createSubSolver()");

    vector<const FiniteElemSpace*> fe;
    fe.push_back(componentSpaces[component]);

    PetscSolver* subSolver = new PetscSolverGlobalMatrix("");
897
    subSolver->setKspPrefix(kspPrefix);
898
    subSolver->setMeshDistributor(meshDistributor, 0);
899 900 901 902 903 904 905 906 907
    subSolver->init(fe, fe);

    ParallelDofMapping &subDofMap = subSolver->getDofMap();
    subDofMap[0] = dofMap[component];
    subDofMap.update();

    return subSolver;
  }

908 909 910 911

  void PetscSolverGlobalMatrix::setConstantNullSpace(KSP ksp,
						     int constFeSpace,
						     bool test)
Thomas Witkowski's avatar
blub  
Thomas Witkowski committed
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
  {
    FUNCNAME("PetscSolverGlobalMatrix::setConstantNullSpace()");

    Vec nullSpaceBasis;
    VecDuplicate(getVecSolInterior(), &nullSpaceBasis);
    
    SystemVector basisVec("tmp", componentSpaces, componentSpaces.size(), true);
    basisVec.set(0.0);
    basisVec.getDOFVector(constFeSpace)->set(1.0);
    
    setDofVector(nullSpaceBasis, basisVec, true);
    VecAssemblyBegin(nullSpaceBasis);
    VecAssemblyEnd(nullSpaceBasis);
    VecNormalize(nullSpaceBasis, PETSC_NULL);
    
    if (test) {
      Vec tmp;
      MatGetVecs(getMatInterior(), &tmp, PETSC_NULL);
      MatMult(getMatInterior(), nullSpaceBasis, tmp);
      PetscReal n;
      VecNorm(tmp, NORM_2, &n);
      MSG("NORM IS: %e\n", n);
      VecDestroy(&tmp);
935
    }
Thomas Witkowski's avatar
blub  
Thomas Witkowski committed
936 937 938
    
    
    MatNullSpace matNullSpace;
939
    MatNullSpaceCreate(domainComm, PETSC_FALSE, 1, &nullSpaceBasis, &matNullSpace);
Thomas Witkowski's avatar
blub  
Thomas Witkowski committed
940 941
    KSPSetNullSpace(ksp, matNullSpace);
    MatNullSpaceDestroy(&matNullSpace);
942 943

    VecDestroy(&nullSpaceBasis);
Thomas Witkowski's avatar
blub  
Thomas Witkowski committed
944 945
  }

946

Thomas Witkowski's avatar
blub  
Thomas Witkowski committed
947 948 949 950 951
  void PetscSolverGlobalMatrix::setConstantNullSpace(KSP ksp)
  {
    FUNCNAME("PetscSolverGlobalMatrix::setConstantNullSpace()");

    MatNullSpace matNullSpace;
952
    MatNullSpaceCreate(domainComm, PETSC_TRUE, 0, PETSC_NULL, &matNullSpace);
Thomas Witkowski's avatar
blub  
Thomas Witkowski committed
953 954 955
    KSPSetNullSpace(ksp, matNullSpace);
    MatNullSpaceDestroy(&matNullSpace);
  }
956

957
} } // end namespace Parallel, AMDiS