Actual source code: essl.c

  2: /* 
  3:         Provides an interface to the IBM RS6000 Essl sparse solver

  5: */
  6: #include <../src/mat/impls/aij/seq/aij.h>

  8: /* #include <essl.h> This doesn't work!  */

 11: void dgss(int*,int*,double*,int*,int*,int*,double*,double*,int*);
 12: void dgsf(int*,int*,int*,double*,int*,int*,int*,int*,double*,double*,double*,int*);

 15: typedef struct {
 16:   int         n,nz;
 17:   PetscScalar *a;
 18:   int         *ia;
 19:   int         *ja;
 20:   int         lna;
 21:   int         iparm[5];
 22:   PetscReal   rparm[5];
 23:   PetscReal   oparm[5];
 24:   PetscScalar *aux;
 25:   int         naux;

 27:   PetscBool  CleanUpESSL;
 28: } Mat_Essl;

 32: PetscErrorCode MatDestroy_Essl(Mat A)
 33: {
 35:   Mat_Essl       *essl=(Mat_Essl*)A->spptr;

 38:   if (essl && essl->CleanUpESSL) {
 39:     PetscFree4(essl->a,essl->aux,essl->ia,essl->ja);
 40:   }
 41:   PetscFree(A->spptr);
 42:   MatDestroy_SeqAIJ(A);
 43:   return(0);
 44: }

 48: PetscErrorCode MatSolve_Essl(Mat A,Vec b,Vec x)
 49: {
 50:   Mat_Essl       *essl = (Mat_Essl*)A->spptr;
 51:   PetscScalar    *xx;
 53:   int            m,zero = 0;

 56:   VecGetLocalSize(b,&m);
 57:   VecCopy(b,x);
 58:   VecGetArray(x,&xx);
 59:   dgss(&zero,&A->cmap->n,essl->a,essl->ia,essl->ja,&essl->lna,xx,essl->aux,&essl->naux);
 60:   VecRestoreArray(x,&xx);
 61:   return(0);
 62: }

 66: PetscErrorCode MatLUFactorNumeric_Essl(Mat F,Mat A,const MatFactorInfo *info)
 67: {
 68:   Mat_SeqAIJ     *aa=(Mat_SeqAIJ*)(A)->data;
 69:   Mat_Essl       *essl=(Mat_Essl*)(F)->spptr;
 71:   int            i,one = 1;

 74:   /* copy matrix data into silly ESSL data structure (1-based Frotran style) */
 75:   for (i=0; i<A->rmap->n+1; i++) essl->ia[i] = aa->i[i] + 1;
 76:   for (i=0; i<aa->nz; i++) essl->ja[i]  = aa->j[i] + 1;
 77: 
 78:   PetscMemcpy(essl->a,aa->a,(aa->nz)*sizeof(PetscScalar));
 79: 
 80:   /* set Essl options */
 81:   essl->iparm[0] = 1;
 82:   essl->iparm[1] = 5;
 83:   essl->iparm[2] = 1;
 84:   essl->iparm[3] = 0;
 85:   essl->rparm[0] = 1.e-12;
 86:   essl->rparm[1] = 1.0;
 87:   PetscOptionsGetReal(((PetscObject)A)->prefix,"-matessl_lu_threshold",&essl->rparm[1],PETSC_NULL);

 89:   dgsf(&one,&A->rmap->n,&essl->nz,essl->a,essl->ia,essl->ja,&essl->lna,essl->iparm,essl->rparm,essl->oparm,essl->aux,&essl->naux);

 91:   F->ops->solve = MatSolve_Essl;
 92:   (F)->assembled = PETSC_TRUE;
 93:   (F)->preallocated = PETSC_TRUE;
 94:   return(0);
 95: }




102: PetscErrorCode MatLUFactorSymbolic_Essl(Mat B,Mat A,IS r,IS c,const MatFactorInfo *info)
103: {
104:   Mat_SeqAIJ     *a = (Mat_SeqAIJ*)A->data;
106:   Mat_Essl       *essl;
107:   PetscReal      f = 1.0;

110:   essl = (Mat_Essl *)(B->spptr);

112:   /* allocate the work arrays required by ESSL */
113:   f = info->fill;
114:   essl->nz   = a->nz;
115:   essl->lna  = (int)a->nz*f;
116:   essl->naux = 100 + 10*A->rmap->n;

118:   /* since malloc is slow on IBM we try a single malloc */
119:   PetscMalloc4(essl->lna,PetscScalar,&essl->a,essl->naux,PetscScalar,&essl->aux,essl->lna,int,&essl->ia,essl->lna,int,&essl->ja);
120:   essl->CleanUpESSL = PETSC_TRUE;

122:   PetscLogObjectMemory(B,essl->lna*(2*sizeof(int)+sizeof(PetscScalar)) + essl->naux*sizeof(PetscScalar));
123:   B->ops->lufactornumeric  = MatLUFactorNumeric_Essl;
124:   return(0);
125: }

130: PetscErrorCode MatFactorGetSolverPackage_essl(Mat A,const MatSolverPackage *type)
131: {
133:   *type = MATSOLVERESSL;
134:   return(0);
135: }

137: /*MC
138:   MATSOLVERESSL - "essl" - Provides direct solvers (LU) for sequential matrices 
139:                               via the external package ESSL.

141:   If ESSL is installed (see the manual for
142:   instructions on how to declare the existence of external packages),

144:   Works with MATSEQAIJ matrices

146:    Level: beginner

148: .seealso: PCLU, PCFactorSetMatSolverPackage(), MatSolverPackage
149: M*/

153: PetscErrorCode MatGetFactor_seqaij_essl(Mat A,MatFactorType ftype,Mat *F)
154: {
155:   Mat            B;
157:   Mat_Essl       *essl;

160:   if (A->cmap->N != A->rmap->N) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ,"matrix must be square");
161:   MatCreate(((PetscObject)A)->comm,&B);
162:   MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,A->rmap->n,A->cmap->n);
163:   MatSetType(B,((PetscObject)A)->type_name);
164:   MatSeqAIJSetPreallocation(B,0,PETSC_NULL);

166:   PetscNewLog(B,Mat_Essl,&essl);
167:   B->spptr                 = essl;
168:   B->ops->lufactorsymbolic = MatLUFactorSymbolic_Essl;
169:   PetscObjectComposeFunctionDynamic((PetscObject)B,"MatFactorGetSolverPackage_C","MatFactorGetSolverPackage_essl",MatFactorGetSolverPackage_essl);
170:   B->factortype            = MAT_FACTOR_LU;
171:   *F                       = B;
172:   return(0);
173: }