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!  */

 10: EXTERN_C_BEGIN
 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*);
 13: EXTERN_C_END

 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            nessl,zero = 0;

 56:   nessl = PetscBLASIntCast(A->cmap->n);
 57:   VecCopy(b,x);
 58:   VecGetArray(x,&xx);
 59:   dgss(&zero,&nessl,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            nessl,i,one = 1;

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

 90:   dgsf(&one,&nessl,&essl->nz,essl->a,essl->ia,essl->ja,&essl->lna,essl->iparm,essl->rparm,essl->oparm,essl->aux,&essl->naux);

 92:   F->ops->solve = MatSolve_Essl;
 93:   (F)->assembled = PETSC_TRUE;
 94:   (F)->preallocated = PETSC_TRUE;
 95:   return(0);
 96: }




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

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

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

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

123:   PetscLogObjectMemory(B,essl->lna*(2*sizeof(int)+sizeof(PetscScalar)) + essl->naux*sizeof(PetscScalar));
124:   B->ops->lufactornumeric  = MatLUFactorNumeric_Essl;
125:   return(0);
126: }

128: EXTERN_C_BEGIN
131: PetscErrorCode MatFactorGetSolverPackage_essl(Mat A,const MatSolverPackage *type)
132: {
134:   *type = MATSOLVERESSL;
135:   return(0);
136: }

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

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

145:   Works with MATSEQAIJ matrices

147:    Level: beginner

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

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

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

167:   PetscNewLog(B,Mat_Essl,&essl);
168:   B->spptr                 = essl;
169:   B->ops->lufactorsymbolic = MatLUFactorSymbolic_Essl;
170:   PetscObjectComposeFunctionDynamic((PetscObject)B,"MatFactorGetSolverPackage_C","MatFactorGetSolverPackage_essl",MatFactorGetSolverPackage_essl);
171:   B->factortype            = MAT_FACTOR_LU;
172:   *F                       = B;
173:   return(0);
174: }
175: EXTERN_C_END