Date: 2021-03-03T22:26:13+00:00

Actual source code: aijcholmod.c
petsc-3.14.5 2021-03-03
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      2: #include <../src/mat/impls/aij/seq/aij.h>
      3: #include <../src/mat/impls/sbaij/seq/cholmod/cholmodimpl.h>

      5: static PetscErrorCode MatWrapCholmod_seqaij(Mat A,PetscBool values,cholmod_sparse *C,PetscBool *aijalloc,PetscBool *valloc)
      6: {
      7:   Mat_SeqAIJ        *aij = (Mat_SeqAIJ*)A->data;
      8:   const PetscScalar *aa;
      9:   PetscScalar       *ca;
     10:   const PetscInt    *ai = aij->i,*aj = aij->j,*adiag;
     11:   PetscInt          m = A->rmap->n,i,j,k,nz,*ci,*cj;
     12:   PetscBool         vain = PETSC_FALSE;
     13:   PetscErrorCode    ierr;

     16:   MatMarkDiagonal_SeqAIJ(A);
     17:   adiag = aij->diag;
     18:   for (i=0,nz=0; i<m; i++) nz += ai[i+1] - adiag[i];
     19:   PetscMalloc2(m+1,&ci,nz,&cj);
     20:   if (values) {
     21:     vain = PETSC_TRUE;
     22:     PetscMalloc1(nz,&ca);
     23:     MatSeqAIJGetArrayRead(A,&aa);
     24:   }
     25:   for (i=0,k=0; i<m; i++) {
     26:     ci[i] = k;
     27:     for (j=adiag[i]; j<ai[i+1]; j++,k++) {
     28:       cj[k] = aj[j];
     29:       if (values) ca[k] = PetscConj(aa[j]);
     30:     }
     31:   }
     32:   ci[i]     = k;
     33:   *aijalloc = PETSC_TRUE;
     34:   *valloc   = vain;
     35:   if (values) {
     36:     MatSeqAIJRestoreArrayRead(A,&aa);
     37:   }

     39:   PetscMemzero(C,sizeof(*C));

     41:   C->nrow   = (size_t)A->cmap->n;
     42:   C->ncol   = (size_t)A->rmap->n;
     43:   C->nzmax  = (size_t)nz;
     44:   C->p      = ci;
     45:   C->i      = cj;
     46:   C->x      = values ? ca : 0;
     47:   C->stype  = -1;
     48:   C->itype  = CHOLMOD_INT_TYPE;
     49:   C->xtype  = values ? CHOLMOD_SCALAR_TYPE : CHOLMOD_PATTERN;
     50:   C->dtype  = CHOLMOD_DOUBLE;
     51:   C->sorted = 1;
     52:   C->packed = 1;
     53:   return(0);
     54: }

     56: static PetscErrorCode MatFactorGetSolverType_seqaij_cholmod(Mat A,MatSolverType *type)
     57: {
     59:   *type = MATSOLVERCHOLMOD;
     60:   return(0);
     61: }

     63: /* Almost a copy of MatGetFactor_seqsbaij_cholmod, yuck */
     64: PETSC_INTERN PetscErrorCode MatGetFactor_seqaij_cholmod(Mat A,MatFactorType ftype,Mat *F)
     65: {
     66:   Mat            B;
     67:   Mat_CHOLMOD    *chol;
     69:   PetscInt       m=A->rmap->n,n=A->cmap->n;
     70:   const char     *prefix;

     73: #if defined(PETSC_USE_COMPLEX)
     74:   if (!A->hermitian) SETERRQ(PetscObjectComm((PetscObject)A),PETSC_ERR_SUP,"Only for hermitian matrices");
     75: #endif
     76:   /* Create the factorization matrix F */
     77:   MatCreate(PetscObjectComm((PetscObject)A),&B);
     78:   MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,m,n);
     79:   PetscStrallocpy("cholmod",&((PetscObject)B)->type_name);
     80:   MatGetOptionsPrefix(A,&prefix);
     81:   MatSetOptionsPrefix(B,prefix);
     82:   MatSetUp(B);
     83:   PetscNewLog(B,&chol);

     85:   chol->Wrap = MatWrapCholmod_seqaij;
     86:   B->data    = chol;

     88:   B->ops->getinfo                = MatGetInfo_CHOLMOD;
     89:   B->ops->view                   = MatView_CHOLMOD;
     90:   B->ops->choleskyfactorsymbolic = MatCholeskyFactorSymbolic_CHOLMOD;
     91:   B->ops->destroy                = MatDestroy_CHOLMOD;

     93:   PetscObjectComposeFunction((PetscObject)B,"MatFactorGetSolverType_C",MatFactorGetSolverType_seqaij_cholmod);

     95:   B->factortype   = MAT_FACTOR_CHOLESKY;
     96:   B->assembled    = PETSC_TRUE;
     97:   B->preallocated = PETSC_TRUE;

     99:   PetscFree(B->solvertype);
    100:   PetscStrallocpy(MATSOLVERCHOLMOD,&B->solvertype);
    101:   B->useordering = PETSC_TRUE;
    102:   CholmodStart(B);
    103:   *F   = B;
    104:   return(0);
    105: }