1 #include <../src/ksp/pc/impls/bddc/bddc.h> 2 #include <../src/ksp/pc/impls/bddc/bddcprivate.h> 3 4 #undef __FUNCT__ 5 #define __FUNCT__ "PCBDDCNullSpaceAssembleCoarse" 6 PetscErrorCode PCBDDCNullSpaceAssembleCoarse(PC pc, Mat coarse_mat, MatNullSpace* CoarseNullSpace) 7 { 8 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 9 Mat_IS *matis = (Mat_IS*)pc->pmat->data; 10 MatNullSpace tempCoarseNullSpace; 11 const Vec *nsp_vecs; 12 Vec *coarse_nsp_vecs,local_vec,local_primal_vec; 13 PetscInt nsp_size,coarse_nsp_size,i; 14 PetscBool nsp_has_cnst; 15 PetscReal test_null; 16 PetscErrorCode ierr; 17 18 PetscFunctionBegin; 19 tempCoarseNullSpace = 0; 20 coarse_nsp_size = 0; 21 coarse_nsp_vecs = 0; 22 ierr = MatNullSpaceGetVecs(pcbddc->NullSpace,&nsp_has_cnst,&nsp_size,&nsp_vecs);CHKERRQ(ierr); 23 if (coarse_mat) { 24 ierr = PetscMalloc1((nsp_size+1),&coarse_nsp_vecs);CHKERRQ(ierr); 25 for (i=0;i<nsp_size+1;i++) { 26 ierr = VecDuplicate(pcbddc->coarse_vec,&coarse_nsp_vecs[i]);CHKERRQ(ierr); 27 } 28 } 29 ierr = MatGetVecs(pcbddc->ConstraintMatrix,&local_vec,&local_primal_vec);CHKERRQ(ierr); 30 if (nsp_has_cnst) { 31 ierr = VecSet(local_vec,1.0);CHKERRQ(ierr); 32 ierr = MatMult(pcbddc->ConstraintMatrix,local_vec,local_primal_vec);CHKERRQ(ierr); 33 ierr = PCBDDCScatterCoarseDataBegin(pc,local_primal_vec,pcbddc->coarse_vec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 34 ierr = PCBDDCScatterCoarseDataEnd(pc,local_primal_vec,pcbddc->coarse_vec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 35 if (coarse_mat) { 36 if (pcbddc->dbg_flag) { 37 ierr = MatMult(coarse_mat,pcbddc->coarse_vec,pcbddc->coarse_rhs);CHKERRQ(ierr); 38 ierr = VecNorm(pcbddc->coarse_rhs,NORM_INFINITY,&test_null);CHKERRQ(ierr); 39 ierr = PetscViewerASCIIPrintf(pcbddc->dbg_viewer,"Constant coarse null space error % 1.14e\n",test_null);CHKERRQ(ierr); 40 } 41 ierr = VecCopy(pcbddc->coarse_vec,coarse_nsp_vecs[coarse_nsp_size]);CHKERRQ(ierr); 42 coarse_nsp_size++; 43 } 44 } 45 for (i=0;i<nsp_size;i++) { 46 ierr = VecScatterBegin(matis->ctx,nsp_vecs[i],local_vec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 47 ierr = VecScatterEnd(matis->ctx,nsp_vecs[i],local_vec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 48 ierr = MatMult(pcbddc->ConstraintMatrix,local_vec,local_primal_vec);CHKERRQ(ierr); 49 ierr = PCBDDCScatterCoarseDataBegin(pc,local_primal_vec,pcbddc->coarse_vec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 50 ierr = PCBDDCScatterCoarseDataEnd(pc,local_primal_vec,pcbddc->coarse_vec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 51 if (coarse_mat) { 52 if (pcbddc->dbg_flag) { 53 ierr = MatMult(coarse_mat,pcbddc->coarse_vec,pcbddc->coarse_rhs);CHKERRQ(ierr); 54 ierr = VecNorm(pcbddc->coarse_rhs,NORM_2,&test_null);CHKERRQ(ierr); 55 ierr = PetscViewerASCIIPrintf(pcbddc->dbg_viewer,"Vec %d coarse null space error % 1.14e\n",i,test_null);CHKERRQ(ierr); 56 } 57 ierr = VecCopy(pcbddc->coarse_vec,coarse_nsp_vecs[coarse_nsp_size]);CHKERRQ(ierr); 58 coarse_nsp_size++; 59 } 60 } 61 if (coarse_nsp_size > 0) { 62 ierr = PCBDDCOrthonormalizeVecs(coarse_nsp_size,coarse_nsp_vecs);CHKERRQ(ierr); 63 ierr = MatNullSpaceCreate(PetscObjectComm((PetscObject)coarse_mat),PETSC_FALSE,coarse_nsp_size,coarse_nsp_vecs,&tempCoarseNullSpace);CHKERRQ(ierr); 64 for (i=0;i<nsp_size+1;i++) { 65 ierr = VecDestroy(&coarse_nsp_vecs[i]);CHKERRQ(ierr); 66 } 67 } 68 ierr = PetscFree(coarse_nsp_vecs);CHKERRQ(ierr); 69 ierr = VecDestroy(&local_vec);CHKERRQ(ierr); 70 ierr = VecDestroy(&local_primal_vec);CHKERRQ(ierr); 71 *CoarseNullSpace = tempCoarseNullSpace; 72 PetscFunctionReturn(0); 73 } 74 75 76 #undef __FUNCT__ 77 #define __FUNCT__ "PCBDDCApplyNullSpaceCorrectionPC" 78 static PetscErrorCode PCBDDCApplyNullSpaceCorrectionPC(PC pc,Vec x,Vec y) 79 { 80 NullSpaceCorrection_ctx pc_ctx; 81 PetscErrorCode ierr; 82 83 PetscFunctionBegin; 84 ierr = PCShellGetContext(pc,(void**)&pc_ctx);CHKERRQ(ierr); 85 /* E */ 86 ierr = MatMultTranspose(pc_ctx->Lbasis_mat,x,pc_ctx->work_small_2);CHKERRQ(ierr); 87 ierr = MatMultAdd(pc_ctx->Kbasis_mat,pc_ctx->work_small_2,x,pc_ctx->work_full_1);CHKERRQ(ierr); 88 /* P^-1 */ 89 ierr = PCApply(pc_ctx->local_pc,pc_ctx->work_full_1,pc_ctx->work_full_2);CHKERRQ(ierr); 90 /* E^T */ 91 ierr = MatMultTranspose(pc_ctx->Kbasis_mat,pc_ctx->work_full_2,pc_ctx->work_small_1);CHKERRQ(ierr); 92 ierr = VecScale(pc_ctx->work_small_1,-1.0);CHKERRQ(ierr); 93 ierr = MatMultAdd(pc_ctx->Lbasis_mat,pc_ctx->work_small_1,pc_ctx->work_full_2,pc_ctx->work_full_1);CHKERRQ(ierr); 94 /* Sum contributions */ 95 ierr = MatMultAdd(pc_ctx->basis_mat,pc_ctx->work_small_2,pc_ctx->work_full_1,y);CHKERRQ(ierr); 96 PetscFunctionReturn(0); 97 } 98 99 #undef __FUNCT__ 100 #define __FUNCT__ "PCBDDCDestroyNullSpaceCorrectionPC" 101 static PetscErrorCode PCBDDCDestroyNullSpaceCorrectionPC(PC pc) 102 { 103 NullSpaceCorrection_ctx pc_ctx; 104 PetscErrorCode ierr; 105 106 PetscFunctionBegin; 107 ierr = PCShellGetContext(pc,(void**)&pc_ctx);CHKERRQ(ierr); 108 ierr = VecDestroy(&pc_ctx->work_small_1);CHKERRQ(ierr); 109 ierr = VecDestroy(&pc_ctx->work_small_2);CHKERRQ(ierr); 110 ierr = VecDestroy(&pc_ctx->work_full_1);CHKERRQ(ierr); 111 ierr = VecDestroy(&pc_ctx->work_full_2);CHKERRQ(ierr); 112 ierr = MatDestroy(&pc_ctx->basis_mat);CHKERRQ(ierr); 113 ierr = MatDestroy(&pc_ctx->Lbasis_mat);CHKERRQ(ierr); 114 ierr = MatDestroy(&pc_ctx->Kbasis_mat);CHKERRQ(ierr); 115 ierr = PCDestroy(&pc_ctx->local_pc);CHKERRQ(ierr); 116 ierr = PetscFree(pc_ctx);CHKERRQ(ierr); 117 PetscFunctionReturn(0); 118 } 119 120 /* 121 PETSC_EXTERN PetscErrorCode PCBDDCApplyNullSpaceCorrectionPC(PC,Vec,Vec); 122 PETSC_EXTERN PetscErrorCode PCBDDCDestroyNullSpaceCorrectionPC(PC); 123 */ 124 125 #undef __FUNCT__ 126 #define __FUNCT__ "PCBDDCNullSpaceAssembleCorrection" 127 PetscErrorCode PCBDDCNullSpaceAssembleCorrection(PC pc,IS local_dofs) 128 { 129 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 130 PC_IS *pcis = (PC_IS*)pc->data; 131 Mat_IS* matis = (Mat_IS*)pc->pmat->data; 132 KSP *local_ksp; 133 PC newpc; 134 NullSpaceCorrection_ctx shell_ctx; 135 Mat local_mat,local_pmat,small_mat,inv_small_mat; 136 Vec work1,work2; 137 const Vec *nullvecs; 138 VecScatter scatter_ctx; 139 IS is_aux; 140 MatFactorInfo matinfo; 141 PetscScalar *basis_mat,*Kbasis_mat,*array,*array_mat; 142 PetscScalar one = 1.0,zero = 0.0, m_one = -1.0; 143 PetscInt basis_dofs,basis_size,nnsp_size,i,k,n_I,n_R; 144 PetscBool nnsp_has_cnst; 145 PetscErrorCode ierr; 146 147 PetscFunctionBegin; 148 /* Infer the local solver */ 149 ierr = ISGetSize(local_dofs,&basis_dofs);CHKERRQ(ierr); 150 ierr = VecGetSize(pcis->vec1_D,&n_I);CHKERRQ(ierr); 151 ierr = VecGetSize(pcbddc->vec1_R,&n_R);CHKERRQ(ierr); 152 if (basis_dofs == n_I) { 153 /* Dirichlet solver */ 154 local_ksp = &pcbddc->ksp_D; 155 } else if (basis_dofs == n_R) { 156 /* Neumann solver */ 157 local_ksp = &pcbddc->ksp_R; 158 } else { 159 SETERRQ4(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Error in %s: unknown local IS size %d. n_I=%d, n_R=%d)\n",__FUNCT__,basis_dofs,n_I,n_R); 160 } 161 ierr = KSPGetOperators(*local_ksp,&local_mat,&local_pmat);CHKERRQ(ierr); 162 163 /* Get null space vecs */ 164 ierr = MatNullSpaceGetVecs(pcbddc->NullSpace,&nnsp_has_cnst,&nnsp_size,&nullvecs);CHKERRQ(ierr); 165 basis_size = nnsp_size; 166 if (nnsp_has_cnst) { 167 basis_size++; 168 } 169 170 if (basis_dofs) { 171 /* Create shell ctx */ 172 ierr = PetscMalloc(sizeof(*shell_ctx),&shell_ctx);CHKERRQ(ierr); 173 174 /* Create work vectors in shell context */ 175 ierr = VecCreate(PETSC_COMM_SELF,&shell_ctx->work_small_1);CHKERRQ(ierr); 176 ierr = VecSetSizes(shell_ctx->work_small_1,basis_size,basis_size);CHKERRQ(ierr); 177 ierr = VecSetType(shell_ctx->work_small_1,VECSEQ);CHKERRQ(ierr); 178 ierr = VecDuplicate(shell_ctx->work_small_1,&shell_ctx->work_small_2);CHKERRQ(ierr); 179 ierr = VecCreate(PETSC_COMM_SELF,&shell_ctx->work_full_1);CHKERRQ(ierr); 180 ierr = VecSetSizes(shell_ctx->work_full_1,basis_dofs,basis_dofs);CHKERRQ(ierr); 181 ierr = VecSetType(shell_ctx->work_full_1,VECSEQ);CHKERRQ(ierr); 182 ierr = VecDuplicate(shell_ctx->work_full_1,&shell_ctx->work_full_2);CHKERRQ(ierr); 183 184 /* Allocate workspace */ 185 ierr = MatCreateSeqDense(PETSC_COMM_SELF,basis_dofs,basis_size,NULL,&shell_ctx->basis_mat );CHKERRQ(ierr); 186 ierr = MatCreateSeqDense(PETSC_COMM_SELF,basis_dofs,basis_size,NULL,&shell_ctx->Kbasis_mat);CHKERRQ(ierr); 187 ierr = MatDenseGetArray(shell_ctx->basis_mat,&basis_mat);CHKERRQ(ierr); 188 ierr = MatDenseGetArray(shell_ctx->Kbasis_mat,&Kbasis_mat);CHKERRQ(ierr); 189 190 /* Restrict local null space on selected dofs (Dirichlet or Neumann) 191 and compute matrices N and K*N */ 192 ierr = VecDuplicate(shell_ctx->work_full_1,&work1);CHKERRQ(ierr); 193 ierr = VecDuplicate(shell_ctx->work_full_1,&work2);CHKERRQ(ierr); 194 ierr = VecScatterCreate(pcis->vec1_N,local_dofs,work1,(IS)0,&scatter_ctx);CHKERRQ(ierr); 195 } 196 197 for (k=0;k<nnsp_size;k++) { 198 ierr = VecScatterBegin(matis->ctx,nullvecs[k],pcis->vec1_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 199 ierr = VecScatterEnd(matis->ctx,nullvecs[k],pcis->vec1_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 200 if (basis_dofs) { 201 ierr = VecPlaceArray(work1,(const PetscScalar*)&basis_mat[k*basis_dofs]);CHKERRQ(ierr); 202 ierr = VecScatterBegin(scatter_ctx,pcis->vec1_N,work1,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 203 ierr = VecScatterEnd(scatter_ctx,pcis->vec1_N,work1,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 204 ierr = VecPlaceArray(work2,(const PetscScalar*)&Kbasis_mat[k*basis_dofs]);CHKERRQ(ierr); 205 ierr = MatMult(local_mat,work1,work2);CHKERRQ(ierr); 206 ierr = VecResetArray(work1);CHKERRQ(ierr); 207 ierr = VecResetArray(work2);CHKERRQ(ierr); 208 } 209 } 210 211 if (basis_dofs) { 212 if (nnsp_has_cnst) { 213 ierr = VecPlaceArray(work1,(const PetscScalar*)&basis_mat[k*basis_dofs]);CHKERRQ(ierr); 214 ierr = VecSet(work1,one);CHKERRQ(ierr); 215 ierr = VecPlaceArray(work2,(const PetscScalar*)&Kbasis_mat[k*basis_dofs]);CHKERRQ(ierr); 216 ierr = MatMult(local_mat,work1,work2);CHKERRQ(ierr); 217 ierr = VecResetArray(work1);CHKERRQ(ierr); 218 ierr = VecResetArray(work2);CHKERRQ(ierr); 219 } 220 ierr = VecDestroy(&work1);CHKERRQ(ierr); 221 ierr = VecDestroy(&work2);CHKERRQ(ierr); 222 ierr = VecScatterDestroy(&scatter_ctx);CHKERRQ(ierr); 223 ierr = MatDenseRestoreArray(shell_ctx->basis_mat,&basis_mat);CHKERRQ(ierr); 224 ierr = MatDenseRestoreArray(shell_ctx->Kbasis_mat,&Kbasis_mat);CHKERRQ(ierr); 225 226 /* Assemble another Mat object in shell context */ 227 ierr = MatTransposeMatMult(shell_ctx->basis_mat,shell_ctx->Kbasis_mat,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&small_mat);CHKERRQ(ierr); 228 ierr = MatFactorInfoInitialize(&matinfo);CHKERRQ(ierr); 229 ierr = ISCreateStride(PETSC_COMM_SELF,basis_size,0,1,&is_aux);CHKERRQ(ierr); 230 ierr = MatLUFactor(small_mat,is_aux,is_aux,&matinfo);CHKERRQ(ierr); 231 ierr = ISDestroy(&is_aux);CHKERRQ(ierr); 232 ierr = PetscMalloc1(basis_size*basis_size,&array_mat);CHKERRQ(ierr); 233 for (k=0;k<basis_size;k++) { 234 ierr = VecSet(shell_ctx->work_small_1,zero);CHKERRQ(ierr); 235 ierr = VecSetValue(shell_ctx->work_small_1,k,one,INSERT_VALUES);CHKERRQ(ierr); 236 ierr = VecAssemblyBegin(shell_ctx->work_small_1);CHKERRQ(ierr); 237 ierr = VecAssemblyEnd(shell_ctx->work_small_1);CHKERRQ(ierr); 238 ierr = MatSolve(small_mat,shell_ctx->work_small_1,shell_ctx->work_small_2);CHKERRQ(ierr); 239 ierr = VecGetArrayRead(shell_ctx->work_small_2,(const PetscScalar**)&array);CHKERRQ(ierr); 240 for (i=0;i<basis_size;i++) { 241 array_mat[i*basis_size+k]=array[i]; 242 } 243 ierr = VecRestoreArrayRead(shell_ctx->work_small_2,(const PetscScalar**)&array);CHKERRQ(ierr); 244 } 245 ierr = MatCreateSeqDense(PETSC_COMM_SELF,basis_size,basis_size,array_mat,&inv_small_mat);CHKERRQ(ierr); 246 ierr = MatMatMult(shell_ctx->basis_mat,inv_small_mat,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&shell_ctx->Lbasis_mat);CHKERRQ(ierr); 247 ierr = PetscFree(array_mat);CHKERRQ(ierr); 248 ierr = MatDestroy(&inv_small_mat);CHKERRQ(ierr); 249 ierr = MatDestroy(&small_mat);CHKERRQ(ierr); 250 ierr = MatScale(shell_ctx->Kbasis_mat,m_one);CHKERRQ(ierr); 251 252 /* Rebuild local PC */ 253 ierr = KSPGetPC(*local_ksp,&shell_ctx->local_pc);CHKERRQ(ierr); 254 ierr = PetscObjectReference((PetscObject)shell_ctx->local_pc);CHKERRQ(ierr); 255 ierr = PCCreate(PETSC_COMM_SELF,&newpc);CHKERRQ(ierr); 256 ierr = PCSetOperators(newpc,local_mat,local_mat);CHKERRQ(ierr); 257 ierr = PCSetType(newpc,PCSHELL);CHKERRQ(ierr); 258 ierr = PCShellSetContext(newpc,shell_ctx);CHKERRQ(ierr); 259 ierr = PCShellSetApply(newpc,PCBDDCApplyNullSpaceCorrectionPC);CHKERRQ(ierr); 260 ierr = PCShellSetDestroy(newpc,PCBDDCDestroyNullSpaceCorrectionPC);CHKERRQ(ierr); 261 ierr = PCSetUp(newpc);CHKERRQ(ierr); 262 ierr = KSPSetPC(*local_ksp,newpc);CHKERRQ(ierr); 263 ierr = PCDestroy(&newpc);CHKERRQ(ierr); 264 ierr = KSPSetUp(*local_ksp);CHKERRQ(ierr); 265 } 266 /* test */ 267 if (pcbddc->dbg_flag && basis_dofs) { 268 KSP check_ksp; 269 PC check_pc; 270 Mat test_mat; 271 Vec work3; 272 PetscReal test_err,lambda_min,lambda_max; 273 PetscBool setsym,issym=PETSC_FALSE; 274 PetscInt tabs; 275 276 ierr = PetscViewerASCIIGetTab(pcbddc->dbg_viewer,&tabs);CHKERRQ(ierr); 277 ierr = KSPGetPC(*local_ksp,&check_pc);CHKERRQ(ierr); 278 ierr = VecDuplicate(shell_ctx->work_full_1,&work1);CHKERRQ(ierr); 279 ierr = VecDuplicate(shell_ctx->work_full_1,&work2);CHKERRQ(ierr); 280 ierr = VecDuplicate(shell_ctx->work_full_1,&work3);CHKERRQ(ierr); 281 ierr = VecSetRandom(shell_ctx->work_small_1,NULL);CHKERRQ(ierr); 282 ierr = MatMult(shell_ctx->basis_mat,shell_ctx->work_small_1,work1);CHKERRQ(ierr); 283 ierr = VecCopy(work1,work2);CHKERRQ(ierr); 284 ierr = MatMult(local_mat,work1,work3);CHKERRQ(ierr); 285 ierr = PCApply(check_pc,work3,work1);CHKERRQ(ierr); 286 ierr = VecAXPY(work1,m_one,work2);CHKERRQ(ierr); 287 ierr = VecNorm(work1,NORM_INFINITY,&test_err);CHKERRQ(ierr); 288 ierr = PetscViewerASCIISynchronizedPrintf(pcbddc->dbg_viewer,"Subdomain %04d error for nullspace correction for ",PetscGlobalRank); 289 ierr = PetscViewerASCIIUseTabs(pcbddc->dbg_viewer,PETSC_FALSE);CHKERRQ(ierr); 290 if (basis_dofs == n_I) { 291 ierr = PetscViewerASCIISynchronizedPrintf(pcbddc->dbg_viewer,"Dirichlet "); 292 } else { 293 ierr = PetscViewerASCIISynchronizedPrintf(pcbddc->dbg_viewer,"Neumann "); 294 } 295 ierr = PetscViewerASCIISynchronizedPrintf(pcbddc->dbg_viewer,"solver is :%1.14e\n",test_err); 296 ierr = PetscViewerASCIISetTab(pcbddc->dbg_viewer,tabs);CHKERRQ(ierr); 297 ierr = PetscViewerASCIIUseTabs(pcbddc->dbg_viewer,PETSC_TRUE);CHKERRQ(ierr); 298 299 ierr = MatTransposeMatMult(shell_ctx->Lbasis_mat,shell_ctx->Kbasis_mat,MAT_INITIAL_MATRIX,PETSC_DEFAULT,&test_mat);CHKERRQ(ierr); 300 ierr = MatShift(test_mat,one);CHKERRQ(ierr); 301 ierr = MatNorm(test_mat,NORM_INFINITY,&test_err);CHKERRQ(ierr); 302 ierr = MatDestroy(&test_mat);CHKERRQ(ierr); 303 ierr = PetscViewerASCIISynchronizedPrintf(pcbddc->dbg_viewer,"Subdomain %04d error for nullspace matrices is :%1.14e\n",PetscGlobalRank,test_err); 304 305 /* Create ksp object suitable for extreme eigenvalues' estimation */ 306 ierr = KSPCreate(PETSC_COMM_SELF,&check_ksp);CHKERRQ(ierr); 307 ierr = KSPSetOperators(check_ksp,local_mat,local_mat);CHKERRQ(ierr); 308 ierr = KSPSetTolerances(check_ksp,1.e-8,1.e-8,PETSC_DEFAULT,basis_dofs);CHKERRQ(ierr); 309 ierr = KSPSetComputeSingularValues(check_ksp,PETSC_TRUE);CHKERRQ(ierr); 310 ierr = MatIsSymmetricKnown(pc->pmat,&setsym,&issym);CHKERRQ(ierr); 311 if (issym) { 312 ierr = KSPSetType(check_ksp,KSPCG);CHKERRQ(ierr); 313 } 314 ierr = KSPSetPC(check_ksp,check_pc);CHKERRQ(ierr); 315 ierr = KSPSetUp(check_ksp);CHKERRQ(ierr); 316 ierr = VecSetRandom(work1,NULL);CHKERRQ(ierr); 317 ierr = MatMult(local_mat,work1,work2);CHKERRQ(ierr); 318 ierr = KSPSolve(check_ksp,work2,work2);CHKERRQ(ierr); 319 ierr = VecAXPY(work2,m_one,work1);CHKERRQ(ierr); 320 ierr = VecNorm(work2,NORM_INFINITY,&test_err);CHKERRQ(ierr); 321 ierr = KSPComputeExtremeSingularValues(check_ksp,&lambda_max,&lambda_min);CHKERRQ(ierr); 322 ierr = KSPGetIterationNumber(check_ksp,&k);CHKERRQ(ierr); 323 ierr = PetscViewerASCIISynchronizedPrintf(pcbddc->dbg_viewer,"Subdomain %04d error for adapted KSP %1.14e (it %d, eigs %1.6e %1.6e)\n",PetscGlobalRank,test_err,k,lambda_min,lambda_max); 324 ierr = KSPDestroy(&check_ksp);CHKERRQ(ierr); 325 ierr = VecDestroy(&work1);CHKERRQ(ierr); 326 ierr = VecDestroy(&work2);CHKERRQ(ierr); 327 ierr = VecDestroy(&work3);CHKERRQ(ierr); 328 } 329 /* all processes shoud call this, even the void ones */ 330 if (pcbddc->dbg_flag) { 331 ierr = PetscViewerFlush(pcbddc->dbg_viewer);CHKERRQ(ierr); 332 } 333 PetscFunctionReturn(0); 334 } 335 336 #undef __FUNCT__ 337 #define __FUNCT__ "PCBDDCNullSpaceAdaptGlobal" 338 PetscErrorCode PCBDDCNullSpaceAdaptGlobal(PC pc) 339 { 340 PC_IS* pcis = (PC_IS*) (pc->data); 341 PC_BDDC* pcbddc = (PC_BDDC*)(pc->data); 342 KSP inv_change; 343 PC pc_change; 344 const Vec *nsp_vecs; 345 Vec *new_nsp_vecs; 346 PetscInt i,nsp_size,new_nsp_size,start_new; 347 PetscBool nsp_has_cnst; 348 MatNullSpace new_nsp; 349 PetscErrorCode ierr; 350 MPI_Comm comm; 351 352 PetscFunctionBegin; 353 /* create KSP for change of basis */ 354 ierr = KSPCreate(PETSC_COMM_SELF,&inv_change);CHKERRQ(ierr); 355 ierr = KSPSetOperators(inv_change,pcbddc->ChangeOfBasisMatrix,pcbddc->ChangeOfBasisMatrix);CHKERRQ(ierr); 356 ierr = KSPSetType(inv_change,KSPPREONLY);CHKERRQ(ierr); 357 ierr = KSPGetPC(inv_change,&pc_change);CHKERRQ(ierr); 358 ierr = PCSetType(pc_change,PCLU);CHKERRQ(ierr); 359 ierr = KSPSetUp(inv_change);CHKERRQ(ierr); 360 /* get nullspace and transform it */ 361 ierr = MatNullSpaceGetVecs(pcbddc->NullSpace,&nsp_has_cnst,&nsp_size,&nsp_vecs);CHKERRQ(ierr); 362 new_nsp_size = nsp_size; 363 if (nsp_has_cnst) { 364 new_nsp_size++; 365 } 366 ierr = PetscMalloc1(new_nsp_size,&new_nsp_vecs);CHKERRQ(ierr); 367 for (i=0;i<new_nsp_size;i++) { 368 ierr = VecDuplicate(pcis->vec1_global,&new_nsp_vecs[i]);CHKERRQ(ierr); 369 } 370 start_new = 0; 371 if (nsp_has_cnst) { 372 start_new = 1; 373 ierr = VecSet(new_nsp_vecs[0],1.0);CHKERRQ(ierr); 374 ierr = VecSet(pcis->vec1_B,1.0);CHKERRQ(ierr); 375 ierr = KSPSolve(inv_change,pcis->vec1_B,pcis->vec1_B); 376 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,new_nsp_vecs[0],INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 377 ierr = VecScatterEnd (pcis->global_to_B,pcis->vec1_B,new_nsp_vecs[0],INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 378 } 379 for (i=0;i<nsp_size;i++) { 380 ierr = VecCopy(nsp_vecs[i],new_nsp_vecs[i+start_new]);CHKERRQ(ierr); 381 ierr = VecScatterBegin(pcis->global_to_B,nsp_vecs[i],pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 382 ierr = VecScatterEnd (pcis->global_to_B,nsp_vecs[i],pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 383 ierr = KSPSolve(inv_change,pcis->vec1_B,pcis->vec1_B); 384 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,new_nsp_vecs[i+start_new],INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 385 ierr = VecScatterEnd (pcis->global_to_B,pcis->vec1_B,new_nsp_vecs[i+start_new],INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 386 } 387 ierr = PCBDDCOrthonormalizeVecs(new_nsp_size,new_nsp_vecs);CHKERRQ(ierr); 388 #if 0 389 PetscBool nsp_t=PETSC_FALSE; 390 ierr = MatNullSpaceTest(pcbddc->NullSpace,pc->pmat,&nsp_t);CHKERRQ(ierr); 391 printf("Original Null Space test: %d\n",nsp_t); 392 Mat temp_mat; 393 Mat_IS* matis = (Mat_IS*)pc->pmat->data; 394 temp_mat = matis->A; 395 matis->A = pcbddc->local_mat; 396 pcbddc->local_mat = temp_mat; 397 ierr = MatNullSpaceTest(pcbddc->NullSpace,pc->pmat,&nsp_t);CHKERRQ(ierr); 398 printf("Original Null Space, mat changed test: %d\n",nsp_t); 399 { 400 PetscReal test_norm; 401 for (i=0;i<new_nsp_size;i++) { 402 ierr = MatMult(pc->pmat,new_nsp_vecs[i],pcis->vec1_global);CHKERRQ(ierr); 403 ierr = VecNorm(pcis->vec1_global,NORM_2,&test_norm);CHKERRQ(ierr); 404 if (test_norm > 1.e-12) { 405 printf("------------ERROR VEC %d------------------\n",i); 406 ierr = VecView(pcis->vec1_global,PETSC_VIEWER_STDOUT_WORLD); 407 printf("------------------------------------------\n"); 408 } 409 } 410 } 411 #endif 412 413 ierr = KSPDestroy(&inv_change);CHKERRQ(ierr); 414 ierr = PetscObjectGetComm((PetscObject)pc,&comm);CHKERRQ(ierr); 415 ierr = MatNullSpaceCreate(comm,PETSC_FALSE,new_nsp_size,new_nsp_vecs,&new_nsp);CHKERRQ(ierr); 416 ierr = PCBDDCSetNullSpace(pc,new_nsp);CHKERRQ(ierr); 417 ierr = MatNullSpaceDestroy(&new_nsp);CHKERRQ(ierr); 418 #if 0 419 ierr = MatNullSpaceTest(pcbddc->NullSpace,pc->pmat,&nsp_t);CHKERRQ(ierr); 420 printf("New Null Space, mat changed: %d\n",nsp_t); 421 temp_mat = matis->A; 422 matis->A = pcbddc->local_mat; 423 pcbddc->local_mat = temp_mat; 424 ierr = MatNullSpaceTest(pcbddc->NullSpace,pc->pmat,&nsp_t);CHKERRQ(ierr); 425 printf("New Null Space, mat original: %d\n",nsp_t); 426 #endif 427 428 for (i=0;i<new_nsp_size;i++) { 429 ierr = VecDestroy(&new_nsp_vecs[i]);CHKERRQ(ierr); 430 } 431 ierr = PetscFree(new_nsp_vecs);CHKERRQ(ierr); 432 PetscFunctionReturn(0); 433 } 434