DMSlicedSetPreallocation#
sets the matrix memory preallocation for matrices computed by DMSLICED
Synopsis#
#include "petscdmsliced.h" 
PetscErrorCode DMSlicedSetPreallocation(DM dm, PetscInt d_nz, const PetscInt d_nnz[], PetscInt o_nz, const PetscInt o_nnz[])
Not Collective
Input Parameters#
- dm - the - DMobject
- d_nz - number of block nonzeros per block row in diagonal portion of local submatrix (same for all local rows) 
- d_nnz - array containing the number of block nonzeros in the various block rows of the in diagonal portion of the local (possibly different for each block row) or - NULL.
- o_nz - number of block nonzeros per block row in the off-diagonal portion of local submatrix (same for all local rows). 
- o_nnz - array containing the number of nonzeros in the various block rows of the off-diagonal portion of the local submatrix (possibly different for each block row) or - NULL.
Note#
See MatMPIBAIJSetPreallocation() for more details on preallocation.  If a scalar matrix (MATAIJ) is
obtained with DMSlicedGetMatrix(), the correct preallocation will be set, respecting DMSlicedSetBlockFills().
See Also#
DM, DMSLICED, DMDestroy(), DMCreateGlobalVector(), MatMPIAIJSetPreallocation(),
MatMPIBAIJSetPreallocation(), DMSlicedGetMatrix(), DMSlicedSetBlockFills()
Level#
advanced
Location#
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages