DMSetMatrixPreallocateOnly

When DMCreateMatrix() is called the matrix will be properly preallocated but the nonzero structure and zero values will not be set.

Synopsis

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMSetMatrixPreallocateOnly(DM dm, PetscBool only)

Logically Collective

Input Parameters

• dm - the DM

• only - PETSC_TRUE if only want preallocation

Options Database Key

• -dm_preallocate_only - Only preallocate the matrix for DMCreateMatrix(), DMCreateMassMatrix(), but do not fill it with zeros

See Also

DM Basics, DM, DMCreateMatrix(), DMCreateMassMatrix(), DMSetMatrixStructureOnly(), DMSetMatrixPreallocateSkip()

Level

developer

Location

src/dm/interface/dm.c

Examples

src/tao/unconstrained/tutorials/burgers_spectral.c
src/dm/impls/stag/tutorials/ex8.c
src/tao/unconstrained/tutorials/spectraladjointassimilation.c
src/ts/tutorials/ex50.c

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