Actual source code: saviennacl.cu
petsc-3.10.5 2019-03-28
Report Typos and Errors

      2: /*  -------------------------------------------------------------------- */

      4: /*
      5:    Include files needed for the ViennaCL Smoothed Aggregation preconditioner:
      6:      pcimpl.h - private include file intended for use by all preconditioners
      7: */
      8: #define PETSC_SKIP_SPINLOCK
      9:  #include <petsc/private/pcimpl.h>
     10:  #include <../src/mat/impls/aij/seq/aij.h>
     11:  #include <../src/vec/vec/impls/dvecimpl.h>
     12:  #include <../src/mat/impls/aij/seq/seqviennacl/viennaclmatimpl.h>
     13:  #include <../src/vec/vec/impls/seq/seqviennacl/viennaclvecimpl.h>
     14: #include <viennacl/linalg/amg.hpp>

     16: /*
     17:    Private context (data structure) for the SAVIENNACL preconditioner.
     18: */
     19: typedef struct {
     20:   viennacl::linalg::amg_precond<viennacl::compressed_matrix<PetscScalar> > *SAVIENNACL;
     21: } PC_SAVIENNACL;

     24: /* -------------------------------------------------------------------------- */
     25: /*
     26:    PCSetUp_SAVIENNACL - Prepares for the use of the SAVIENNACL preconditioner
     27:                         by setting data structures and options.

     29:    Input Parameter:
     30: .  pc - the preconditioner context

     32:    Application Interface Routine: PCSetUp()

     34:    Notes:
     35:    The interface routine PCSetUp() is not usually called directly by
     36:    the user, but instead is called by PCApply() if necessary.
     37: */
     38: static PetscErrorCode PCSetUp_SAVIENNACL(PC pc)
     39: {
     40:   PC_SAVIENNACL      *sa = (PC_SAVIENNACL*)pc->data;
     41:   PetscBool          flg = PETSC_FALSE;
     42:   PetscErrorCode     ierr;
     43:   Mat_SeqAIJViennaCL *gpustruct;

     46:   PetscObjectTypeCompare((PetscObject)pc->pmat,MATSEQAIJVIENNACL,&flg);
     47:   if (!flg) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Currently only handles ViennaCL matrices");
     48:   if (pc->setupcalled != 0) {
     49:     try {
     50:       delete sa->SAVIENNACL;
     51:     } catch(char *ex) {
     52:       SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
     53:     }
     54:   }
     55:   try {
     56: #if defined(PETSC_USE_COMPLEX)
     57:     gpustruct = NULL;
     58:     SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"No support for complex arithmetic in SAVIENNACL preconditioner");
     59: #else
     60:     MatViennaCLCopyToGPU(pc->pmat);
     61:     gpustruct = (Mat_SeqAIJViennaCL*)(pc->pmat->spptr);
     62:
     63:     viennacl::linalg::amg_tag amg_tag_sa_pmis;
     64:     amg_tag_sa_pmis.set_coarsening_method(viennacl::linalg::AMG_COARSENING_METHOD_MIS2_AGGREGATION);
     65:     amg_tag_sa_pmis.set_interpolation_method(viennacl::linalg::AMG_INTERPOLATION_METHOD_SMOOTHED_AGGREGATION);
     66:     ViennaCLAIJMatrix *mat = (ViennaCLAIJMatrix*)gpustruct->mat;
     67:     sa->SAVIENNACL = new viennacl::linalg::amg_precond<viennacl::compressed_matrix<PetscScalar> >(*mat, amg_tag_sa_pmis);
     68:     sa->SAVIENNACL->setup();
     69: #endif
     70:   } catch(char *ex) {
     71:     SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
     72:   }
     73:   return(0);
     74: }

     76: /* -------------------------------------------------------------------------- */
     77: /*
     78:    PCApply_SAVIENNACL - Applies the SAVIENNACL preconditioner to a vector.

     80:    Input Parameters:
     81: .  pc - the preconditioner context
     82: .  x - input vector

     84:    Output Parameter:
     85: .  y - output vector

     87:    Application Interface Routine: PCApply()
     88:  */
     89: static PetscErrorCode PCApply_SAVIENNACL(PC pc,Vec x,Vec y)
     90: {
     91:   PC_SAVIENNACL                 *sac = (PC_SAVIENNACL*)pc->data;
     92:   PetscErrorCode                ierr;
     93:   PetscBool                     flg1,flg2;
     94:   viennacl::vector<PetscScalar> const *xarray=NULL;
     95:   viennacl::vector<PetscScalar> *yarray=NULL;

     98:   /*how to apply a certain fixed number of iterations?*/
     99:   PetscObjectTypeCompare((PetscObject)x,VECSEQVIENNACL,&flg1);
    100:   PetscObjectTypeCompare((PetscObject)y,VECSEQVIENNACL,&flg2);
    101:   if (!(flg1 && flg2)) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP, "Currently only handles ViennaCL vectors");
    102:   if (!sac->SAVIENNACL) {
    103:     PCSetUp_SAVIENNACL(pc);
    104:   }
    105:   VecSet(y,0.0);
    106:   VecViennaCLGetArrayRead(x,&xarray);
    107:   VecViennaCLGetArrayWrite(y,&yarray);
    108:   try {
    109: #if defined(PETSC_USE_COMPLEX)

    111: #else
    112:     *yarray = *xarray;
    113:     sac->SAVIENNACL->apply(*yarray);
    114: #endif
    115:   } catch(char * ex) {
    116:     SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
    117:   }
    118:   VecViennaCLRestoreArrayRead(x,&xarray);
    119:   VecViennaCLRestoreArrayWrite(y,&yarray);
    120:   PetscObjectStateIncrease((PetscObject)y);
    121:   return(0);
    122: }
    123: /* -------------------------------------------------------------------------- */
    124: /*
    125:    PCDestroy_SAVIENNACL - Destroys the private context for the SAVIENNACL preconditioner
    126:    that was created with PCCreate_SAVIENNACL().

    128:    Input Parameter:
    129: .  pc - the preconditioner context

    131:    Application Interface Routine: PCDestroy()
    132: */
    133: static PetscErrorCode PCDestroy_SAVIENNACL(PC pc)
    134: {
    135:   PC_SAVIENNACL  *sac = (PC_SAVIENNACL*)pc->data;

    139:   if (sac->SAVIENNACL) {
    140:     try {
    141:       delete sac->SAVIENNACL;
    142:     } catch(char * ex) {
    143:       SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_LIB,"ViennaCL error: %s", ex);
    144:     }
    145:   }

    147:   /*
    148:       Free the private data structure that was hanging off the PC
    149:   */
    150:   PetscFree(pc->data);
    151:   return(0);
    152: }

    154: static PetscErrorCode PCSetFromOptions_SAVIENNACL(PetscOptionItems *PetscOptionsObject,PC pc)
    155: {

    159:   PetscOptionsHead(PetscOptionsObject,"SAVIENNACL options");
    160:   PetscOptionsTail();
    161:   return(0);
    162: }

    164: /* -------------------------------------------------------------------------- */

    167: /*MC
    168:      PCSAViennaCL  - A smoothed agglomeration algorithm that can be used via the CUDA, OpenCL, and OpenMP backends of ViennaCL

    170:    Level: advanced

    172: .seealso:  PCCreate(), PCSetType(), PCType (for list of available types), PC

    174: M*/

    176: PETSC_EXTERN PetscErrorCode PCCreate_SAVIENNACL(PC pc)
    177: {
    178:   PC_SAVIENNACL  *sac;

    182:   /*
    183:      Creates the private data structure for this preconditioner and
    184:      attach it to the PC object.
    185:   */
    186:   PetscNewLog(pc,&sac);
    187:   pc->data = (void*)sac;

    189:   /*
    190:      Initialize the pointer to zero
    191:      Initialize number of v-cycles to default (1)
    192:   */
    193:   sac->SAVIENNACL = 0;

    195:   /*
    196:       Set the pointers for the functions that are provided above.
    197:       Now when the user-level routines (such as PCApply(), PCDestroy(), etc.)
    198:       are called, they will automatically call these functions.  Note we
    199:       choose not to provide a couple of these functions since they are
    200:       not needed.
    201:   */
    202:   pc->ops->apply               = PCApply_SAVIENNACL;
    203:   pc->ops->applytranspose      = 0;
    204:   pc->ops->setup               = PCSetUp_SAVIENNACL;
    205:   pc->ops->destroy             = PCDestroy_SAVIENNACL;
    206:   pc->ops->setfromoptions      = PCSetFromOptions_SAVIENNACL;
    207:   pc->ops->view                = 0;
    208:   pc->ops->applyrichardson     = 0;
    209:   pc->ops->applysymmetricleft  = 0;
    210:   pc->ops->applysymmetricright = 0;
    211:   return(0);
    212: }