Date: 2015-10-02T22:06:13+00:00

Actual source code: essl.c
petsc-3.6.2 2015-10-02
Report Typos and Errors

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

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

     25:   PetscBool CleanUpESSL;
     26: } Mat_Essl;

     30: PetscErrorCode MatDestroy_Essl(Mat A)
     31: {
     33:   Mat_Essl       *essl=(Mat_Essl*)A->spptr;

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

     46: PetscErrorCode MatSolve_Essl(Mat A,Vec b,Vec x)
     47: {
     48:   Mat_Essl       *essl = (Mat_Essl*)A->spptr;
     49:   PetscScalar    *xx;
     51:   int            nessl,zero = 0;

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

     64: PetscErrorCode MatLUFactorNumeric_Essl(Mat F,Mat A,const MatFactorInfo *info)
     65: {
     66:   Mat_SeqAIJ     *aa  =(Mat_SeqAIJ*)(A)->data;
     67:   Mat_Essl       *essl=(Mat_Essl*)(F)->spptr;
     69:   int            nessl,i,one = 1;

     72:   PetscBLASIntCast(A->rmap->n,&nessl);
     73:   /* copy matrix data into silly ESSL data structure (1-based Frotran style) */
     74:   for (i=0; i<A->rmap->n+1; i++) essl->ia[i] = aa->i[i] + 1;
     75:   for (i=0; i<aa->nz; i++) essl->ja[i] = aa->j[i] + 1;

     77:   PetscMemcpy(essl->a,aa->a,(aa->nz)*sizeof(PetscScalar));

     79:   /* set Essl options */
     80:   essl->iparm[0] = 1;
     81:   essl->iparm[1] = 5;
     82:   essl->iparm[2] = 1;
     83:   essl->iparm[3] = 0;
     84:   essl->rparm[0] = 1.e-12;
     85:   essl->rparm[1] = 1.0;

     87:   PetscOptionsGetReal(((PetscObject)A)->prefix,"-matessl_lu_threshold",&essl->rparm[1],NULL);

     89:   dgsf(&one,&nessl,&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:   PetscBLASIntCast(a->nz,&essl->nz);
    115:   PetscBLASIntCast((PetscInt)(a->nz*f),&essl->lna);
    116:   PetscBLASIntCast(100 + 10*A->rmap->n,&essl->naux);

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

    121:   essl->CleanUpESSL = PETSC_TRUE;

    123:   PetscLogObjectMemory((PetscObject)B,essl->lna*(2*sizeof(int)+sizeof(PetscScalar)) + essl->naux*sizeof(PetscScalar));

    125:   B->ops->lufactornumeric = MatLUFactorNumeric_Essl;
    126:   return(0);
    127: }

    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: PETSC_EXTERN 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(PetscObjectComm((PetscObject)A),&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,NULL);

    167:   PetscNewLog(B,&essl);

    169:   B->spptr                 = essl;
    170:   B->ops->lufactorsymbolic = MatLUFactorSymbolic_Essl;

    172:   PetscObjectComposeFunction((PetscObject)B,"MatFactorGetSolverPackage_C",MatFactorGetSolverPackage_essl);

    174:   B->factortype = MAT_FACTOR_LU;
    175:   *F            = B;
    176:   return(0);
    177: }

    181: PETSC_EXTERN PetscErrorCode MatSolverPackageRegister_Essl(void)
    182: {
    185:   MatSolverPackageRegister(MATSOLVERESSL,MATSEQAIJ,          MAT_FACTOR_LU,MatGetFactor_seqaij_essl);
    186:   return(0);
    187: }