Date: 2015-10-02T22:07:33+00:00

Actual source code: mpiaijviennacl.cxx
petsc-3.6.2 2015-10-02
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      1: #include <petscconf.h>
      2: #include <../src/mat/impls/aij/mpi/mpiaij.h>   /*I "petscmat.h" I*/
      3: #include <../src/mat/impls/aij/seq/seqviennacl/viennaclmatimpl.h>

      7: PetscErrorCode  MatMPIAIJSetPreallocation_MPIAIJViennaCL(Mat B,PetscInt d_nz,const PetscInt d_nnz[],PetscInt o_nz,const PetscInt o_nnz[])
      8: {
      9:   Mat_MPIAIJ *b = (Mat_MPIAIJ*)B->data;

     13:   PetscLayoutSetUp(B->rmap);
     14:   PetscLayoutSetUp(B->cmap);
     15:   if (!B->preallocated) {
     16:     /* Explicitly create the two MATSEQAIJVIENNACL matrices. */
     17:     MatCreate(PETSC_COMM_SELF,&b->A);
     18:     MatSetSizes(b->A,B->rmap->n,B->cmap->n,B->rmap->n,B->cmap->n);
     19:     MatSetType(b->A,MATSEQAIJVIENNACL);
     20:     PetscLogObjectParent((PetscObject)B,(PetscObject)b->A);
     21:     MatCreate(PETSC_COMM_SELF,&b->B);
     22:     MatSetSizes(b->B,B->rmap->n,B->cmap->N,B->rmap->n,B->cmap->N);
     23:     MatSetType(b->B,MATSEQAIJVIENNACL);
     24:     PetscLogObjectParent((PetscObject)B,(PetscObject)b->B);
     25:   }
     26:   MatSeqAIJSetPreallocation(b->A,d_nz,d_nnz);
     27:   MatSeqAIJSetPreallocation(b->B,o_nz,o_nnz);
     28:   B->preallocated = PETSC_TRUE;
     29:   return(0);
     30: }

     34: PetscErrorCode  MatCreateVecs_MPIAIJViennaCL(Mat mat,Vec *right,Vec *left)
     35: {
     37:   PetscInt rbs,cbs;

     40:   MatGetBlockSizes(mat,&rbs,&cbs);
     41:   if (right) {
     42:     VecCreate(PetscObjectComm((PetscObject)mat),right);
     43:     VecSetSizes(*right,mat->cmap->n,PETSC_DETERMINE);
     44:     VecSetBlockSize(*right,cbs);
     45:     VecSetType(*right,VECVIENNACL);
     46:     VecSetLayout(*right,mat->cmap);
     47:   }
     48:   if (left) {
     49:     VecCreate(PetscObjectComm((PetscObject)mat),left);
     50:     VecSetSizes(*left,mat->rmap->n,PETSC_DETERMINE);
     51:     VecSetBlockSize(*left,rbs);
     52:     VecSetType(*left,VECVIENNACL);
     53:     VecSetLayout(*left,mat->rmap);
     54:   }
     55:   return(0);
     56: }

     61: PetscErrorCode MatDestroy_MPIAIJViennaCL(Mat A)
     62: {

     66:   MatDestroy_MPIAIJ(A);
     67:   return(0);
     68: }

     72: PETSC_EXTERN PetscErrorCode MatCreate_MPIAIJViennaCL(Mat A)
     73: {

     77:   MatCreate_MPIAIJ(A);
     78:   PetscObjectComposeFunction((PetscObject)A,"MatMPIAIJSetPreallocation_C",MatMPIAIJSetPreallocation_MPIAIJViennaCL);
     79:   A->ops->getvecs        = MatCreateVecs_MPIAIJViennaCL;

     81:   PetscObjectChangeTypeName((PetscObject)A,MATMPIAIJVIENNACL);
     82:   return(0);
     83: }

     86: /*@
     87:    MatCreateAIJViennaCL - Creates a sparse matrix in AIJ (compressed row) format
     88:    (the default parallel PETSc format).  This matrix will ultimately be pushed down
     89:    to GPUs and use the ViennaCL library for calculations. For good matrix
     90:    assembly performance the user should preallocate the matrix storage by setting
     91:    the parameter nz (or the array nnz).  By setting these parameters accurately,
     92:    performance during matrix assembly can be increased substantially.

     95:    Collective on MPI_Comm

     97:    Input Parameters:
     98: +  comm - MPI communicator, set to PETSC_COMM_SELF
     99: .  m - number of rows
    100: .  n - number of columns
    101: .  nz - number of nonzeros per row (same for all rows)
    102: -  nnz - array containing the number of nonzeros in the various rows
    103:          (possibly different for each row) or NULL

    105:    Output Parameter:
    106: .  A - the matrix

    108:    It is recommended that one use the MatCreate(), MatSetType() and/or MatSetFromOptions(),
    109:    MatXXXXSetPreallocation() paradigm instead of this routine directly.
    110:    [MatXXXXSetPreallocation() is, for example, MatSeqAIJSetPreallocation]

    112:    Notes:
    113:    If nnz is given then nz is ignored

    115:    The AIJ format (also called the Yale sparse matrix format or
    116:    compressed row storage), is fully compatible with standard Fortran 77
    117:    storage.  That is, the stored row and column indices can begin at
    118:    either one (as in Fortran) or zero.  See the users' manual for details.

    120:    Specify the preallocated storage with either nz or nnz (not both).
    121:    Set nz=PETSC_DEFAULT and nnz=NULL for PETSc to control dynamic memory
    122:    allocation.  For large problems you MUST preallocate memory or you
    123:    will get TERRIBLE performance, see the users' manual chapter on matrices.

    125:    Level: intermediate

    127: .seealso: MatCreate(), MatCreateAIJ(), MatCreateAIJCUSP(), MatSetValues(), MatSeqAIJSetColumnIndices(), MatCreateSeqAIJWithArrays(), MatCreateAIJ(), MATMPIAIJVIENNACL, MATAIJVIENNACL
    128: @*/
    131: PetscErrorCode  MatCreateAIJViennaCL(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt M,PetscInt N,PetscInt d_nz,const PetscInt d_nnz[],PetscInt o_nz,const PetscInt o_nnz[],Mat *A)
    132: {
    134:   PetscMPIInt    size;

    137:   MatCreate(comm,A);
    138:   MatSetSizes(*A,m,n,M,N);
    139:   MPI_Comm_size(comm,&size);
    140:   if (size > 1) {
    141:     MatSetType(*A,MATMPIAIJVIENNACL);
    142:     MatMPIAIJSetPreallocation(*A,d_nz,d_nnz,o_nz,o_nnz);
    143:   } else {
    144:     MatSetType(*A,MATSEQAIJVIENNACL);
    145:     MatSeqAIJSetPreallocation(*A,d_nz,d_nnz);
    146:   }
    147:   return(0);
    148: }

    150: /*M
    151:    MATAIJVIENNACL - MATMPIAIJVIENNACL= "aijviennacl" = "mpiaijviennacl" - A matrix type to be used for sparse matrices.

    153:    A matrix type (CSR format) whose data resides on GPUs.
    154:    All matrix calculations are performed using the ViennaCL library.

    156:    This matrix type is identical to MATSEQAIJVIENNACL when constructed with a single process communicator,
    157:    and MATMPIAIJVIENNACL otherwise.  As a result, for single process communicators,
    158:    MatSeqAIJSetPreallocation is supported, and similarly MatMPIAIJSetPreallocation is supported
    159:    for communicators controlling multiple processes.  It is recommended that you call both of
    160:    the above preallocation routines for simplicity.

    162:    Options Database Keys:
    163: +  -mat_type mpiaijviennacl - sets the matrix type to "mpiaijviennacl" during a call to MatSetFromOptions()

    165:   Level: beginner

    167:  .seealso: MatCreateAIJViennaCL(), MATSEQAIJVIENNACL, MatCreateSeqAIJVIENNACL()
    168: M*/