Actual source code: essl.c
1: #define PETSCMAT_DLL
3: /*
4: Provides an interface to the IBM RS6000 Essl sparse solver
6: */
7: #include ../src/mat/impls/aij/seq/aij.h
9: /* #include <essl.h> This doesn't work! */
12: void dgss(int*,int*,double*,int*,int*,int*,double*,double*,int*);
13: void dgsf(int*,int*,int*,double*,int*,int*,int*,int*,double*,double*,double*,int*);
16: typedef struct {
17: int n,nz;
18: PetscScalar *a;
19: int *ia;
20: int *ja;
21: int lna;
22: int iparm[5];
23: PetscReal rparm[5];
24: PetscReal oparm[5];
25: PetscScalar *aux;
26: int naux;
28: PetscTruth CleanUpESSL;
29: } Mat_Essl;
33: PetscErrorCode MatDestroy_Essl(Mat A)
34: {
36: Mat_Essl *essl=(Mat_Essl*)A->spptr;
39: if (essl->CleanUpESSL) {
40: PetscFree4(essl->a,essl->aux,essl->ia,essl->ja);
41: }
42: PetscFree(essl);
43: MatDestroy_SeqAIJ(A);
44: return(0);
45: }
49: PetscErrorCode MatSolve_Essl(Mat A,Vec b,Vec x)
50: {
51: Mat_Essl *essl = (Mat_Essl*)A->spptr;
52: PetscScalar *xx;
54: int m,zero = 0;
57: VecGetLocalSize(b,&m);
58: VecCopy(b,x);
59: VecGetArray(x,&xx);
60: dgss(&zero,&A->cmap->n,essl->a,essl->ia,essl->ja,&essl->lna,xx,essl->aux,&essl->naux);
61: VecRestoreArray(x,&xx);
62: return(0);
63: }
67: PetscErrorCode MatLUFactorNumeric_Essl(Mat F,Mat A,const MatFactorInfo *info)
68: {
69: Mat_SeqAIJ *aa=(Mat_SeqAIJ*)(A)->data;
70: Mat_Essl *essl=(Mat_Essl*)(F)->spptr;
72: int i,one = 1;
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,&A->rmap->n,&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 = a->nz;
116: essl->lna = (int)a->nz*f;
117: essl->naux = 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: }
131: PetscErrorCode MatFactorGetSolverPackage_essl(Mat A,const MatSolverPackage *type)
132: {
134: *type = MAT_SOLVER_ESSL;
135: return(0);
136: }
138: /*MC
139: MAT_SOLVER_ESSL - "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_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->factor = MAT_FACTOR_LU;
172: *F = B;
173: return(0);
174: }