1 #define PETSCMAT_DLL 2 3 /* 4 Provides an interface to the IBM RS6000 Essl sparse solver 5 6 */ 7 #include "../src/mat/impls/aij/seq/aij.h" 8 9 /* #include <essl.h> This doesn't work! */ 10 11 EXTERN_C_BEGIN 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*); 14 EXTERN_C_END 15 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; 27 28 PetscTruth CleanUpESSL; 29 } Mat_Essl; 30 31 #undef __FUNCT__ 32 #define __FUNCT__ "MatDestroy_Essl" 33 PetscErrorCode MatDestroy_Essl(Mat A) 34 { 35 PetscErrorCode ierr; 36 Mat_Essl *essl=(Mat_Essl*)A->spptr; 37 38 PetscFunctionBegin; 39 if (essl->CleanUpESSL) { 40 ierr = PetscFree(essl->a);CHKERRQ(ierr); 41 } 42 ierr = PetscFree(essl);CHKERRQ(ierr); 43 ierr = MatDestroy_SeqAIJ(A);CHKERRQ(ierr); 44 PetscFunctionReturn(0); 45 } 46 47 #undef __FUNCT__ 48 #define __FUNCT__ "MatSolve_Essl" 49 PetscErrorCode MatSolve_Essl(Mat A,Vec b,Vec x) 50 { 51 Mat_Essl *essl = (Mat_Essl*)A->spptr; 52 PetscScalar *xx; 53 PetscErrorCode ierr; 54 int m,zero = 0; 55 56 PetscFunctionBegin; 57 ierr = VecGetLocalSize(b,&m);CHKERRQ(ierr); 58 ierr = VecCopy(b,x);CHKERRQ(ierr); 59 ierr = VecGetArray(x,&xx);CHKERRQ(ierr); 60 dgss(&zero,&A->cmap->n,essl->a,essl->ia,essl->ja,&essl->lna,xx,essl->aux,&essl->naux); 61 ierr = VecRestoreArray(x,&xx);CHKERRQ(ierr); 62 PetscFunctionReturn(0); 63 } 64 65 #undef __FUNCT__ 66 #define __FUNCT__ "MatLUFactorNumeric_Essl" 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; 71 PetscErrorCode ierr; 72 int i,one = 1; 73 74 PetscFunctionBegin; 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 ierr = PetscMemcpy(essl->a,aa->a,(aa->nz)*sizeof(PetscScalar));CHKERRQ(ierr); 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 ierr = PetscOptionsGetReal(((PetscObject)A)->prefix,"-matessl_lu_threshold",&essl->rparm[1],PETSC_NULL);CHKERRQ(ierr); 89 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); 91 92 F->ops->solve = MatSolve_Essl; 93 (F)->assembled = PETSC_TRUE; 94 (F)->preallocated = PETSC_TRUE; 95 PetscFunctionReturn(0); 96 } 97 98 99 100 101 #undef __FUNCT__ 102 #define __FUNCT__ "MatLUFactorSymbolic_Essl" 103 PetscErrorCode MatLUFactorSymbolic_Essl(Mat B,Mat A,IS r,IS c,const MatFactorInfo *info) 104 { 105 Mat_SeqAIJ *a = (Mat_SeqAIJ*)A->data; 106 PetscErrorCode ierr; 107 int len; 108 Mat_Essl *essl; 109 PetscReal f = 1.0; 110 111 PetscFunctionBegin; 112 essl = (Mat_Essl *)(B->spptr); 113 114 /* allocate the work arrays required by ESSL */ 115 f = info->fill; 116 essl->nz = a->nz; 117 essl->lna = (int)a->nz*f; 118 essl->naux = 100 + 10*A->rmap->n; 119 120 /* since malloc is slow on IBM we try a single malloc */ 121 len = essl->lna*(2*sizeof(int)+sizeof(PetscScalar)) + essl->naux*sizeof(PetscScalar); 122 ierr = PetscMalloc(len,&essl->a);CHKERRQ(ierr); 123 essl->aux = essl->a + essl->lna; 124 essl->ia = (int*)(essl->aux + essl->naux); 125 essl->ja = essl->ia + essl->lna; 126 essl->CleanUpESSL = PETSC_TRUE; 127 128 ierr = PetscLogObjectMemory(B,len);CHKERRQ(ierr); 129 B->ops->lufactornumeric = MatLUFactorNumeric_Essl; 130 PetscFunctionReturn(0); 131 } 132 133 EXTERN_C_BEGIN 134 #undef __FUNCT__ 135 #define __FUNCT__ "MatFactorGetSolverPackage_essl" 136 PetscErrorCode MatFactorGetSolverPackage_essl(Mat A,const MatSolverPackage *type) 137 { 138 PetscFunctionBegin; 139 *type = MAT_SOLVER_ESSL; 140 PetscFunctionReturn(0); 141 } 142 EXTERN_C_END 143 144 /*MC 145 MAT_SOLVER_ESSL - "essl" - Provides direct solvers (LU) for sequential matrices 146 via the external package ESSL. 147 148 If ESSL is installed (see the manual for 149 instructions on how to declare the existence of external packages), 150 151 Works with MATSEQAIJ matrices 152 153 Level: beginner 154 155 .seealso: PCLU, PCFactorSetMatSolverPackage(), MatSolverPackage 156 M*/ 157 158 #undef __FUNCT__ 159 #define __FUNCT__ "MatGetFactor_seqaij_essl" 160 PetscErrorCode MatGetFactor_seqaij_essl(Mat A,MatFactorType ftype,Mat *F) 161 { 162 Mat B; 163 PetscErrorCode ierr; 164 Mat_Essl *essl; 165 166 PetscFunctionBegin; 167 if (A->cmap->N != A->rmap->N) SETERRQ(PETSC_ERR_ARG_SIZ,"matrix must be square"); 168 ierr = MatCreate(((PetscObject)A)->comm,&B);CHKERRQ(ierr); 169 ierr = MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,A->rmap->n,A->cmap->n);CHKERRQ(ierr); 170 ierr = MatSetType(B,((PetscObject)A)->type_name);CHKERRQ(ierr); 171 ierr = MatSeqAIJSetPreallocation(B,0,PETSC_NULL);CHKERRQ(ierr); 172 173 ierr = PetscNewLog(B,Mat_Essl,&essl);CHKERRQ(ierr); 174 B->spptr = essl; 175 B->ops->lufactorsymbolic = MatLUFactorSymbolic_Essl; 176 ierr = PetscObjectComposeFunctionDynamic((PetscObject)B,"MatFactorGetSolverPackage_C","MatFactorGetSolverPackage_essl",MatFactorGetSolverPackage_essl);CHKERRQ(ierr); 177 B->factor = MAT_FACTOR_LU; 178 *F = B; 179 PetscFunctionReturn(0); 180 } 181