1 /* 2 GAMG geometric-algebric multigrid PC - Mark Adams 2011 3 */ 4 #include <petsc/private/matimpl.h> 5 #include <../src/ksp/pc/impls/gamg/gamg.h> /*I "petscpc.h" I*/ 6 7 /* 8 Produces a set of block column indices of the matrix row, one for each block represented in the original row 9 10 n - the number of block indices in cc[] 11 cc - the block indices (must be large enough to contain the indices) 12 */ 13 PETSC_STATIC_INLINE PetscErrorCode MatCollapseRow(Mat Amat,PetscInt row,PetscInt bs,PetscInt *n,PetscInt *cc) 14 { 15 PetscInt cnt = -1,nidx,j; 16 const PetscInt *idx; 17 PetscErrorCode ierr; 18 19 PetscFunctionBegin; 20 ierr = MatGetRow(Amat,row,&nidx,&idx,NULL);CHKERRQ(ierr); 21 if (nidx) { 22 cnt = 0; 23 cc[cnt] = idx[0]/bs; 24 for (j=1; j<nidx; j++) { 25 if (cc[cnt] < idx[j]/bs) cc[++cnt] = idx[j]/bs; 26 } 27 } 28 ierr = MatRestoreRow(Amat,row,&nidx,&idx,NULL);CHKERRQ(ierr); 29 *n = cnt+1; 30 PetscFunctionReturn(0); 31 } 32 33 /* 34 Produces a set of block column indices of the matrix block row, one for each block represented in the original set of rows 35 36 ncollapsed - the number of block indices 37 collapsed - the block indices (must be large enough to contain the indices) 38 */ 39 PETSC_STATIC_INLINE PetscErrorCode MatCollapseRows(Mat Amat,PetscInt start,PetscInt bs,PetscInt *w0,PetscInt *w1,PetscInt *w2,PetscInt *ncollapsed,PetscInt **collapsed) 40 { 41 PetscInt i,nprev,*cprev = w0,ncur = 0,*ccur = w1,*merged = w2,*cprevtmp; 42 PetscErrorCode ierr; 43 44 PetscFunctionBegin; 45 ierr = MatCollapseRow(Amat,start,bs,&nprev,cprev);CHKERRQ(ierr); 46 for (i=start+1; i<start+bs; i++) { 47 ierr = MatCollapseRow(Amat,i,bs,&ncur,ccur);CHKERRQ(ierr); 48 ierr = PetscMergeIntArray(nprev,cprev,ncur,ccur,&nprev,&merged);CHKERRQ(ierr); 49 cprevtmp = cprev; cprev = merged; merged = cprevtmp; 50 } 51 *ncollapsed = nprev; 52 if (collapsed) *collapsed = cprev; 53 PetscFunctionReturn(0); 54 } 55 56 57 /* -------------------------------------------------------------------------- */ 58 /* 59 PCGAMGCreateGraph - create simple scaled scalar graph from matrix 60 61 Input Parameter: 62 . Amat - matrix 63 Output Parameter: 64 . a_Gmaat - eoutput scalar graph (symmetric?) 65 */ 66 PetscErrorCode PCGAMGCreateGraph(Mat Amat, Mat *a_Gmat) 67 { 68 PetscErrorCode ierr; 69 PetscInt Istart,Iend,Ii,jj,kk,ncols,nloc,NN,MM,bs; 70 MPI_Comm comm; 71 Mat Gmat; 72 MatType mtype; 73 74 PetscFunctionBegin; 75 ierr = PetscObjectGetComm((PetscObject)Amat,&comm);CHKERRQ(ierr); 76 ierr = MatGetOwnershipRange(Amat, &Istart, &Iend);CHKERRQ(ierr); 77 ierr = MatGetSize(Amat, &MM, &NN);CHKERRQ(ierr); 78 ierr = MatGetBlockSize(Amat, &bs);CHKERRQ(ierr); 79 nloc = (Iend-Istart)/bs; 80 81 #if defined PETSC_GAMG_USE_LOG 82 ierr = PetscLogEventBegin(petsc_gamg_setup_events[GRAPH],0,0,0,0);CHKERRQ(ierr); 83 #endif 84 85 if (bs > 1) { 86 const PetscScalar *vals; 87 const PetscInt *idx; 88 PetscInt *d_nnz, *o_nnz,*w0,*w1,*w2; 89 PetscBool ismpiaij,isseqaij; 90 91 /* 92 Determine the preallocation needed for the scalar matrix derived from the vector matrix. 93 */ 94 95 ierr = PetscObjectBaseTypeCompare((PetscObject)Amat,MATSEQAIJ,&isseqaij);CHKERRQ(ierr); 96 ierr = PetscObjectBaseTypeCompare((PetscObject)Amat,MATMPIAIJ,&ismpiaij);CHKERRQ(ierr); 97 ierr = PetscMalloc2(nloc, &d_nnz,isseqaij ? 0 : nloc, &o_nnz);CHKERRQ(ierr); 98 99 if (isseqaij) { 100 PetscInt max_d_nnz; 101 102 /* 103 Determine exact preallocation count for (sequential) scalar matrix 104 */ 105 ierr = MatSeqAIJGetMaxRowNonzeros(Amat,&max_d_nnz);CHKERRQ(ierr); 106 max_d_nnz = PetscMin(nloc,bs*max_d_nnz);CHKERRQ(ierr); 107 ierr = PetscMalloc3(max_d_nnz, &w0,max_d_nnz, &w1,max_d_nnz, &w2);CHKERRQ(ierr); 108 for (Ii = 0, jj = 0; Ii < Iend; Ii += bs, jj++) { 109 ierr = MatCollapseRows(Amat,Ii,bs,w0,w1,w2,&d_nnz[jj],NULL);CHKERRQ(ierr); 110 } 111 ierr = PetscFree3(w0,w1,w2);CHKERRQ(ierr); 112 113 } else if (ismpiaij) { 114 Mat Daij,Oaij; 115 const PetscInt *garray; 116 PetscInt max_d_nnz; 117 118 ierr = MatMPIAIJGetSeqAIJ(Amat,&Daij,&Oaij,&garray);CHKERRQ(ierr); 119 120 /* 121 Determine exact preallocation count for diagonal block portion of scalar matrix 122 */ 123 ierr = MatSeqAIJGetMaxRowNonzeros(Daij,&max_d_nnz);CHKERRQ(ierr); 124 max_d_nnz = PetscMin(nloc,bs*max_d_nnz);CHKERRQ(ierr); 125 ierr = PetscMalloc3(max_d_nnz, &w0,max_d_nnz, &w1,max_d_nnz, &w2);CHKERRQ(ierr); 126 for (Ii = 0, jj = 0; Ii < Iend - Istart; Ii += bs, jj++) { 127 ierr = MatCollapseRows(Daij,Ii,bs,w0,w1,w2,&d_nnz[jj],NULL);CHKERRQ(ierr); 128 } 129 ierr = PetscFree3(w0,w1,w2);CHKERRQ(ierr); 130 131 /* 132 Over estimate (usually grossly over), preallocation count for off-diagonal portion of scalar matrix 133 */ 134 for (Ii = 0, jj = 0; Ii < Iend - Istart; Ii += bs, jj++) { 135 o_nnz[jj] = 0; 136 for (kk=0; kk<bs; kk++) { /* rows that get collapsed to a single row */ 137 ierr = MatGetRow(Oaij,Ii+kk,&ncols,0,0);CHKERRQ(ierr); 138 o_nnz[jj] += ncols; 139 ierr = MatRestoreRow(Oaij,Ii+kk,&ncols,0,0);CHKERRQ(ierr); 140 } 141 if (o_nnz[jj] > (NN/bs-nloc)) o_nnz[jj] = NN/bs-nloc; 142 } 143 144 } else SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Require AIJ matrix type"); 145 146 /* get scalar copy (norms) of matrix */ 147 ierr = MatGetType(Amat,&mtype);CHKERRQ(ierr); 148 ierr = MatCreate(comm, &Gmat);CHKERRQ(ierr); 149 ierr = MatSetSizes(Gmat,nloc,nloc,PETSC_DETERMINE,PETSC_DETERMINE);CHKERRQ(ierr); 150 ierr = MatSetBlockSizes(Gmat, 1, 1);CHKERRQ(ierr); 151 ierr = MatSetType(Gmat, mtype);CHKERRQ(ierr); 152 ierr = MatSeqAIJSetPreallocation(Gmat,0,d_nnz);CHKERRQ(ierr); 153 ierr = MatMPIAIJSetPreallocation(Gmat,0,d_nnz,0,o_nnz);CHKERRQ(ierr); 154 ierr = PetscFree2(d_nnz,o_nnz);CHKERRQ(ierr); 155 156 for (Ii = Istart; Ii < Iend; Ii++) { 157 PetscInt dest_row = Ii/bs; 158 ierr = MatGetRow(Amat,Ii,&ncols,&idx,&vals);CHKERRQ(ierr); 159 for (jj=0; jj<ncols; jj++) { 160 PetscInt dest_col = idx[jj]/bs; 161 PetscScalar sv = PetscAbs(PetscRealPart(vals[jj])); 162 ierr = MatSetValues(Gmat,1,&dest_row,1,&dest_col,&sv,ADD_VALUES);CHKERRQ(ierr); 163 } 164 ierr = MatRestoreRow(Amat,Ii,&ncols,&idx,&vals);CHKERRQ(ierr); 165 } 166 ierr = MatAssemblyBegin(Gmat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 167 ierr = MatAssemblyEnd(Gmat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 168 } else { 169 /* just copy scalar matrix - abs() not taken here but scaled later */ 170 ierr = MatDuplicate(Amat, MAT_COPY_VALUES, &Gmat);CHKERRQ(ierr); 171 } 172 173 #if defined PETSC_GAMG_USE_LOG 174 ierr = PetscLogEventEnd(petsc_gamg_setup_events[GRAPH],0,0,0,0);CHKERRQ(ierr); 175 #endif 176 177 *a_Gmat = Gmat; 178 PetscFunctionReturn(0); 179 } 180 181 /* -------------------------------------------------------------------------- */ 182 /*@C 183 PCGAMGFilterGraph - filter (remove zero and possibly small values from the) graph and make it symmetric if requested 184 185 Collective on Mat 186 187 Input Parameter: 188 + a_Gmat - the graph 189 . vfilter - threshold parameter [0,1) 190 - symm - make the result symmetric 191 192 Level: developer 193 194 Notes: 195 This is called before graph coarsers are called. 196 197 .seealso: PCGAMGSetThreshold() 198 @*/ 199 PetscErrorCode PCGAMGFilterGraph(Mat *a_Gmat,PetscReal vfilter,PetscBool symm) 200 { 201 PetscErrorCode ierr; 202 PetscInt Istart,Iend,Ii,jj,ncols,nnz0,nnz1, NN, MM, nloc; 203 PetscMPIInt rank; 204 Mat Gmat = *a_Gmat, tGmat, matTrans; 205 MPI_Comm comm; 206 const PetscScalar *vals; 207 const PetscInt *idx; 208 PetscInt *d_nnz, *o_nnz; 209 Vec diag; 210 MatType mtype; 211 212 PetscFunctionBegin; 213 #if defined PETSC_GAMG_USE_LOG 214 ierr = PetscLogEventBegin(petsc_gamg_setup_events[GRAPH],0,0,0,0);CHKERRQ(ierr); 215 #endif 216 /* scale Gmat for all values between -1 and 1 */ 217 ierr = MatCreateVecs(Gmat, &diag, 0);CHKERRQ(ierr); 218 ierr = MatGetDiagonal(Gmat, diag);CHKERRQ(ierr); 219 ierr = VecReciprocal(diag);CHKERRQ(ierr); 220 ierr = VecSqrtAbs(diag);CHKERRQ(ierr); 221 ierr = MatDiagonalScale(Gmat, diag, diag);CHKERRQ(ierr); 222 ierr = VecDestroy(&diag);CHKERRQ(ierr); 223 224 if (vfilter < 0.0 && !symm) { 225 /* Just use the provided matrix as the graph but make all values positive */ 226 MatInfo info; 227 PetscScalar *avals; 228 PetscBool isaij,ismpiaij; 229 ierr = PetscObjectBaseTypeCompare((PetscObject)Gmat,MATSEQAIJ,&isaij);CHKERRQ(ierr); 230 ierr = PetscObjectBaseTypeCompare((PetscObject)Gmat,MATMPIAIJ,&ismpiaij);CHKERRQ(ierr); 231 if (!isaij && !ismpiaij) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Require (MPI)AIJ matrix type"); 232 if (isaij) { 233 ierr = MatGetInfo(Gmat,MAT_LOCAL,&info);CHKERRQ(ierr); 234 ierr = MatSeqAIJGetArray(Gmat,&avals);CHKERRQ(ierr); 235 for (jj = 0; jj<info.nz_used; jj++) avals[jj] = PetscAbsScalar(avals[jj]); 236 ierr = MatSeqAIJRestoreArray(Gmat,&avals);CHKERRQ(ierr); 237 } else { 238 Mat_MPIAIJ *aij = (Mat_MPIAIJ*)Gmat->data; 239 ierr = MatGetInfo(aij->A,MAT_LOCAL,&info);CHKERRQ(ierr); 240 ierr = MatSeqAIJGetArray(aij->A,&avals);CHKERRQ(ierr); 241 for (jj = 0; jj<info.nz_used; jj++) avals[jj] = PetscAbsScalar(avals[jj]); 242 ierr = MatSeqAIJRestoreArray(aij->A,&avals);CHKERRQ(ierr); 243 ierr = MatGetInfo(aij->B,MAT_LOCAL,&info);CHKERRQ(ierr); 244 ierr = MatSeqAIJGetArray(aij->B,&avals);CHKERRQ(ierr); 245 for (jj = 0; jj<info.nz_used; jj++) avals[jj] = PetscAbsScalar(avals[jj]); 246 ierr = MatSeqAIJRestoreArray(aij->B,&avals);CHKERRQ(ierr); 247 } 248 #if defined PETSC_GAMG_USE_LOG 249 ierr = PetscLogEventEnd(petsc_gamg_setup_events[GRAPH],0,0,0,0);CHKERRQ(ierr); 250 #endif 251 PetscFunctionReturn(0); 252 } 253 254 ierr = PetscObjectGetComm((PetscObject)Gmat,&comm);CHKERRQ(ierr); 255 ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr); 256 ierr = MatGetOwnershipRange(Gmat, &Istart, &Iend);CHKERRQ(ierr); 257 nloc = Iend - Istart; 258 ierr = MatGetSize(Gmat, &MM, &NN);CHKERRQ(ierr); 259 260 if (symm) { 261 ierr = MatTranspose(Gmat, MAT_INITIAL_MATRIX, &matTrans);CHKERRQ(ierr); 262 } 263 264 /* Determine upper bound on nonzeros needed in new filtered matrix */ 265 ierr = PetscMalloc2(nloc, &d_nnz,nloc, &o_nnz);CHKERRQ(ierr); 266 for (Ii = Istart, jj = 0; Ii < Iend; Ii++, jj++) { 267 ierr = MatGetRow(Gmat,Ii,&ncols,NULL,NULL);CHKERRQ(ierr); 268 d_nnz[jj] = ncols; 269 o_nnz[jj] = ncols; 270 ierr = MatRestoreRow(Gmat,Ii,&ncols,NULL,NULL);CHKERRQ(ierr); 271 if (symm) { 272 ierr = MatGetRow(matTrans,Ii,&ncols,NULL,NULL);CHKERRQ(ierr); 273 d_nnz[jj] += ncols; 274 o_nnz[jj] += ncols; 275 ierr = MatRestoreRow(matTrans,Ii,&ncols,NULL,NULL);CHKERRQ(ierr); 276 } 277 if (d_nnz[jj] > nloc) d_nnz[jj] = nloc; 278 if (o_nnz[jj] > (MM-nloc)) o_nnz[jj] = MM - nloc; 279 } 280 ierr = MatGetType(Gmat,&mtype);CHKERRQ(ierr); 281 ierr = MatCreate(comm, &tGmat);CHKERRQ(ierr); 282 ierr = MatSetSizes(tGmat,nloc,nloc,MM,MM);CHKERRQ(ierr); 283 ierr = MatSetBlockSizes(tGmat, 1, 1);CHKERRQ(ierr); 284 ierr = MatSetType(tGmat, mtype);CHKERRQ(ierr); 285 ierr = MatSeqAIJSetPreallocation(tGmat,0,d_nnz);CHKERRQ(ierr); 286 ierr = MatMPIAIJSetPreallocation(tGmat,0,d_nnz,0,o_nnz);CHKERRQ(ierr); 287 ierr = PetscFree2(d_nnz,o_nnz);CHKERRQ(ierr); 288 if (symm) { 289 ierr = MatDestroy(&matTrans);CHKERRQ(ierr); 290 } else { 291 /* all entries are generated locally so MatAssembly will be slightly faster for large process counts */ 292 ierr = MatSetOption(tGmat,MAT_NO_OFF_PROC_ENTRIES,PETSC_TRUE);CHKERRQ(ierr); 293 } 294 295 for (Ii = Istart, nnz0 = nnz1 = 0; Ii < Iend; Ii++) { 296 ierr = MatGetRow(Gmat,Ii,&ncols,&idx,&vals);CHKERRQ(ierr); 297 for (jj=0; jj<ncols; jj++,nnz0++) { 298 PetscScalar sv = PetscAbs(PetscRealPart(vals[jj])); 299 if (PetscRealPart(sv) > vfilter) { 300 nnz1++; 301 if (symm) { 302 sv *= 0.5; 303 ierr = MatSetValues(tGmat,1,&Ii,1,&idx[jj],&sv,ADD_VALUES);CHKERRQ(ierr); 304 ierr = MatSetValues(tGmat,1,&idx[jj],1,&Ii,&sv,ADD_VALUES);CHKERRQ(ierr); 305 } else { 306 ierr = MatSetValues(tGmat,1,&Ii,1,&idx[jj],&sv,ADD_VALUES);CHKERRQ(ierr); 307 } 308 } 309 } 310 ierr = MatRestoreRow(Gmat,Ii,&ncols,&idx,&vals);CHKERRQ(ierr); 311 } 312 ierr = MatAssemblyBegin(tGmat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 313 ierr = MatAssemblyEnd(tGmat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 314 315 #if defined PETSC_GAMG_USE_LOG 316 ierr = PetscLogEventEnd(petsc_gamg_setup_events[GRAPH],0,0,0,0);CHKERRQ(ierr); 317 #endif 318 319 #if defined(PETSC_USE_INFO) 320 { 321 double t1 = (!nnz0) ? 1. : 100.*(double)nnz1/(double)nnz0, t2 = (!nloc) ? 1. : (double)nnz0/(double)nloc; 322 ierr = PetscInfo4(*a_Gmat,"\t %g%% nnz after filtering, with threshold %g, %g nnz ave. (N=%D)\n",t1,vfilter,t2,MM);CHKERRQ(ierr); 323 } 324 #endif 325 ierr = MatDestroy(&Gmat);CHKERRQ(ierr); 326 *a_Gmat = tGmat; 327 PetscFunctionReturn(0); 328 } 329 330 /* -------------------------------------------------------------------------- */ 331 /* 332 PCGAMGGetDataWithGhosts - hacks into Mat MPIAIJ so this must have size > 1 333 334 Input Parameter: 335 . Gmat - MPIAIJ matrix for scattters 336 . data_sz - number of data terms per node (# cols in output) 337 . data_in[nloc*data_sz] - column oriented data 338 Output Parameter: 339 . a_stride - numbrt of rows of output 340 . a_data_out[stride*data_sz] - output data with ghosts 341 */ 342 PetscErrorCode PCGAMGGetDataWithGhosts(Mat Gmat,PetscInt data_sz,PetscReal data_in[],PetscInt *a_stride,PetscReal **a_data_out) 343 { 344 PetscErrorCode ierr; 345 Vec tmp_crds; 346 Mat_MPIAIJ *mpimat = (Mat_MPIAIJ*)Gmat->data; 347 PetscInt nnodes,num_ghosts,dir,kk,jj,my0,Iend,nloc; 348 PetscScalar *data_arr; 349 PetscReal *datas; 350 PetscBool isMPIAIJ; 351 352 PetscFunctionBegin; 353 ierr = PetscObjectBaseTypeCompare((PetscObject)Gmat, MATMPIAIJ, &isMPIAIJ);CHKERRQ(ierr); 354 ierr = MatGetOwnershipRange(Gmat, &my0, &Iend);CHKERRQ(ierr); 355 nloc = Iend - my0; 356 ierr = VecGetLocalSize(mpimat->lvec, &num_ghosts);CHKERRQ(ierr); 357 nnodes = num_ghosts + nloc; 358 *a_stride = nnodes; 359 ierr = MatCreateVecs(Gmat, &tmp_crds, 0);CHKERRQ(ierr); 360 361 ierr = PetscMalloc1(data_sz*nnodes, &datas);CHKERRQ(ierr); 362 for (dir=0; dir<data_sz; dir++) { 363 /* set local, and global */ 364 for (kk=0; kk<nloc; kk++) { 365 PetscInt gid = my0 + kk; 366 PetscScalar crd = (PetscScalar)data_in[dir*nloc + kk]; /* col oriented */ 367 datas[dir*nnodes + kk] = PetscRealPart(crd); 368 369 ierr = VecSetValues(tmp_crds, 1, &gid, &crd, INSERT_VALUES);CHKERRQ(ierr); 370 } 371 ierr = VecAssemblyBegin(tmp_crds);CHKERRQ(ierr); 372 ierr = VecAssemblyEnd(tmp_crds);CHKERRQ(ierr); 373 /* get ghost datas */ 374 ierr = VecScatterBegin(mpimat->Mvctx,tmp_crds,mpimat->lvec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 375 ierr = VecScatterEnd(mpimat->Mvctx,tmp_crds,mpimat->lvec,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 376 ierr = VecGetArray(mpimat->lvec, &data_arr);CHKERRQ(ierr); 377 for (kk=nloc,jj=0;jj<num_ghosts;kk++,jj++) datas[dir*nnodes + kk] = PetscRealPart(data_arr[jj]); 378 ierr = VecRestoreArray(mpimat->lvec, &data_arr);CHKERRQ(ierr); 379 } 380 ierr = VecDestroy(&tmp_crds);CHKERRQ(ierr); 381 *a_data_out = datas; 382 PetscFunctionReturn(0); 383 } 384 385 PetscErrorCode PCGAMGHashTableCreate(PetscInt a_size, PCGAMGHashTable *a_tab) 386 { 387 PetscErrorCode ierr; 388 PetscInt kk; 389 390 PetscFunctionBegin; 391 a_tab->size = a_size; 392 ierr = PetscMalloc2(a_size, &a_tab->table,a_size, &a_tab->data);CHKERRQ(ierr); 393 for (kk=0; kk<a_size; kk++) a_tab->table[kk] = -1; 394 PetscFunctionReturn(0); 395 } 396 397 PetscErrorCode PCGAMGHashTableDestroy(PCGAMGHashTable *a_tab) 398 { 399 PetscErrorCode ierr; 400 401 PetscFunctionBegin; 402 ierr = PetscFree2(a_tab->table,a_tab->data);CHKERRQ(ierr); 403 PetscFunctionReturn(0); 404 } 405 406 PetscErrorCode PCGAMGHashTableAdd(PCGAMGHashTable *a_tab, PetscInt a_key, PetscInt a_data) 407 { 408 PetscInt kk,idx; 409 410 PetscFunctionBegin; 411 if (a_key<0) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_USER,"Negative key %D.",a_key); 412 for (kk = 0, idx = GAMG_HASH(a_key); kk < a_tab->size; kk++, idx = (idx==(a_tab->size-1)) ? 0 : idx + 1) { 413 if (a_tab->table[idx] == a_key) { 414 /* exists */ 415 a_tab->data[idx] = a_data; 416 break; 417 } else if (a_tab->table[idx] == -1) { 418 /* add */ 419 a_tab->table[idx] = a_key; 420 a_tab->data[idx] = a_data; 421 break; 422 } 423 } 424 if (kk==a_tab->size) { 425 /* this is not to efficient, waiting until completely full */ 426 PetscInt oldsize = a_tab->size, new_size = 2*a_tab->size + 5, *oldtable = a_tab->table, *olddata = a_tab->data; 427 PetscErrorCode ierr; 428 429 a_tab->size = new_size; 430 ierr = PetscMalloc2(a_tab->size, &a_tab->table,a_tab->size, &a_tab->data);CHKERRQ(ierr); 431 for (kk=0;kk<a_tab->size;kk++) a_tab->table[kk] = -1; 432 for (kk=0;kk<oldsize;kk++) { 433 if (oldtable[kk] != -1) { 434 ierr = PCGAMGHashTableAdd(a_tab, oldtable[kk], olddata[kk]);CHKERRQ(ierr); 435 } 436 } 437 ierr = PetscFree2(oldtable,olddata);CHKERRQ(ierr); 438 ierr = PCGAMGHashTableAdd(a_tab, a_key, a_data);CHKERRQ(ierr); 439 } 440 PetscFunctionReturn(0); 441 } 442 443