Date: 2016-07-24T16:57:09+00:00

Actual source code: matpreallocator.c
petsc-3.7.3 2016-07-24
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      1: #include <petsc/private/matimpl.h>      /*I "petscmat.h" I*/
      2: #include <../src/sys/utils/hash.h>

      4: typedef struct {
      5:   PetscHashJK ht;
      6:   PetscInt   *dnz, *onz;
      7: } Mat_Preallocator;

     11: PetscErrorCode MatDestroy_Preallocator(Mat A)
     12: {
     13:   Mat_Preallocator *p = (Mat_Preallocator *) A->data;
     14:   PetscErrorCode    ierr;

     17:   MatStashDestroy_Private(&A->stash);
     18:   PetscHashJKDestroy(&p->ht);
     19:   PetscFree2(p->dnz, p->onz);
     20:   PetscFree(A->data);
     21:   PetscObjectChangeTypeName((PetscObject) A, 0);
     22:   PetscObjectComposeFunction((PetscObject) A, "MatPreallocatorPreallocate_C", NULL);
     23:   return(0);
     24: }

     28: PetscErrorCode MatSetUp_Preallocator(Mat A)
     29: {
     30:   Mat_Preallocator *p = (Mat_Preallocator *) A->data;
     31:   PetscInt          m, bs;
     32:   PetscErrorCode    ierr;

     35:   PetscLayoutSetUp(A->rmap);
     36:   PetscLayoutSetUp(A->cmap);
     37:   MatGetLocalSize(A, &m, NULL);
     38:   PetscHashJKCreate(&p->ht);
     39:   MatGetBlockSize(A, &bs);
     40:   MatStashCreate_Private(PetscObjectComm((PetscObject) A), bs, &A->stash);
     41:   PetscCalloc2(m, &p->dnz, m, &p->onz);
     42:   return(0);
     43: }

     47: PetscErrorCode MatSetValues_Preallocator(Mat A, PetscInt m, const PetscInt *rows, PetscInt n, const PetscInt *cols, const PetscScalar *values, InsertMode addv)
     48: {
     49:   Mat_Preallocator *p = (Mat_Preallocator *) A->data;
     50:   PetscInt          rStart, rEnd, r, cStart, cEnd, c;
     51:   PetscErrorCode    ierr;

     54:   /* TODO: Handle blocksize */
     55:   MatGetOwnershipRange(A, &rStart, &rEnd);
     56:   MatGetOwnershipRangeColumn(A, &cStart, &cEnd);
     57:   for (r = 0; r < m; ++r) {
     58:     PetscHashJKKey  key;
     59:     PetscHashJKIter missing, iter;

     61:     key.j = rows[r];
     62:     if (key.j < 0) continue;
     63:     if ((key.j < rStart) || (key.j >= rEnd)) {
     64:       MatStashValuesRow_Private(&A->stash, key.j, n, cols, values, PETSC_FALSE);
     65:     } else {
     66:       for (c = 0; c < n; ++c) {
     67:         key.k = cols[c];
     68:         if (key.k < 0) continue;
     69:         PetscHashJKPut(p->ht, key, &missing, &iter);
     70:         if (missing) {
     71:           PetscHashJKSet(p->ht, iter, 1);
     72:           if ((key.k >= cStart) && (key.k < cEnd)) ++p->dnz[key.j-rStart];
     73:           else                                     ++p->onz[key.j-rStart];
     74:         }
     75:       }
     76:     }
     77:   }
     78:   return(0);
     79: }

     83: PetscErrorCode MatAssemblyBegin_Preallocator(Mat A, MatAssemblyType type)
     84: {
     85:   PetscInt       nstash, reallocs;

     89:   PetscLayoutSetUp(A->rmap);
     90:   MatStashScatterBegin_Private(A, &A->stash, A->rmap->range);
     91:   MatStashGetInfo_Private(&A->stash, &nstash, &reallocs);
     92:   PetscInfo2(A, "Stash has %D entries, uses %D mallocs.\n", nstash, reallocs);
     93:   return(0);
     94: }

     98: PetscErrorCode MatAssemblyEnd_Preallocator(Mat A, MatAssemblyType type)
     99: {
    100:   PetscScalar   *val;
    101:   PetscInt      *row, *col;
    102:   PetscInt       i, j, rstart, ncols, flg;
    103:   PetscMPIInt    n;

    107:   while (1) {
    108:     MatStashScatterGetMesg_Private(&A->stash, &n, &row, &col, &val, &flg);
    109:     if (!flg) break;

    111:     for (i = 0; i < n; ) {
    112:       /* Now identify the consecutive vals belonging to the same row */
    113:       for (j = i, rstart = row[j]; j < n; j++) {
    114:         if (row[j] != rstart) break;
    115:       }
    116:       if (j < n) ncols = j-i;
    117:       else       ncols = n-i;
    118:       /* Now assemble all these values with a single function call */
    119:       MatSetValues_Preallocator(A, 1, row+i, ncols, col+i, val+i, INSERT_VALUES);
    120:       i = j;
    121:     }
    122:   }
    123:   MatStashScatterEnd_Private(&A->stash);
    124:   return(0);
    125: }

    129: PetscErrorCode MatView_Preallocator(Mat A, PetscViewer viewer)
    130: {
    132:   return(0);
    133: }

    137: PetscErrorCode MatSetOption_Preallocator(Mat A, MatOption op, PetscBool flg)
    138: {
    140:   return(0);
    141: }

    145: PetscErrorCode MatPreallocatorPreallocate_Preallocator(Mat mat, PetscBool fill, Mat A)
    146: {
    147:   Mat_Preallocator *p = (Mat_Preallocator *) mat->data;
    148:   PetscInt         *udnz = NULL, *uonz = NULL;
    149:   PetscInt          bs;
    150:   PetscErrorCode    ierr;

    153:   MatGetBlockSize(mat, &bs);
    154:   MatXAIJSetPreallocation(A, bs, p->dnz, p->onz, udnz, uonz);
    155:   MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_TRUE);
    156:   return(0);
    157: }

    161: /*@
    162:   MatPreallocatorPreallocate - Preallocates the input matrix, optionally filling it with zeros

    164:   Input Parameter:
    165: + mat  - the preallocator
    166: - fill - fill the matrix with zeros

    168:   Output Parameter:
    169: . A    - the matrix

    171:   Level: advanced

    173: .seealso: MATPREALLOCATOR
    174: @*/
    175: PetscErrorCode MatPreallocatorPreallocate(Mat mat, PetscBool fill, Mat A)
    176: {

    182:   PetscUseMethod(mat, "MatPreallocatorPreallocate_C", (Mat,PetscBool,Mat),(mat,fill,A));
    183:   return(0);
    184: }

    186: /*MC
    187:    MATPREALLOCATOR - MATPREALLOCATOR = "preallocator" - A matrix type to be used for computing a matrix preallocation.

    189:    Operations Provided:
    190: .  MatSetValues()

    192:    Options Database Keys:
    193: . -mat_type preallocator - sets the matrix type to "preallocator" during a call to MatSetFromOptions()

    195:   Level: advanced

    197: .seealso: Mat

    199: M*/

    203: PETSC_EXTERN PetscErrorCode MatCreate_Preallocator(Mat A)
    204: {
    205:   Mat_Preallocator *p;
    206:   PetscErrorCode    ierr;

    209:   PetscNewLog(A, &p);
    210:   A->data = (void *) p;

    212:   p->ht  = NULL;
    213:   p->dnz = NULL;
    214:   p->onz = NULL;

    216:   /* matrix ops */
    217:   PetscMemzero(A->ops, sizeof(struct _MatOps));
    218:   A->ops->destroy                 = MatDestroy_Preallocator;
    219:   A->ops->setup                   = MatSetUp_Preallocator;
    220:   A->ops->setvalues               = MatSetValues_Preallocator;
    221:   A->ops->assemblybegin           = MatAssemblyBegin_Preallocator;
    222:   A->ops->assemblyend             = MatAssemblyEnd_Preallocator;
    223:   A->ops->view                    = MatView_Preallocator;
    224:   A->ops->setoption               = MatSetOption_Preallocator;

    226:   /* special MATPREALLOCATOR functions */
    227:   PetscObjectComposeFunction((PetscObject) A, "MatPreallocatorPreallocate_C", MatPreallocatorPreallocate_Preallocator);
    228:   PetscObjectChangeTypeName((PetscObject) A, MATPREALLOCATOR);
    229:   return(0);
    230: }