[petsc-users] da_overlap vs width in dmdacreate

[Xiangdong]

Maybe my previous email is not clear. What is the relationship between the
parameter x in DMDASetOverlap and the parameter s in DMDACreate2d? Does x
need to be smaller than s? Are they completely independent?

PetscErrorCode  DMDASetOverlap(DM da,PetscInt x,PetscInt y,PetscInt z)

PetscErrorCode  DMDACreate2d(MPI_Comm comm,DMBoundaryType bx,DMBoundaryType
by,DMDAStencilType stencil_type, PetscInt M,PetscInt N,PetscInt m,PetscInt
n,PetscInt dof,PetscInt s,const PetscInt lx[],const PetscInt ly[],DM *da)

Thanks.

Xiangdong


On Fri, Jun 24, 2016 at 5:23 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>    What arguments are you referring to?
>
> PetscErrorCode  DMDACreate2d(MPI_Comm comm,DMBoundaryType
> bx,DMBoundaryType by,DMDAStencilType stencil_type,
>                           PetscInt M,PetscInt N,PetscInt m,PetscInt
> n,PetscInt dof,PetscInt s,const PetscInt lx[],const PetscInt ly[],DM *da)
>
> the argument s is the stencil width and depends on the finite difference
> stencil you want to use. There is no da_overlap argument.
>
>   Barry
>
> > On Jun 24, 2016, at 4:17 PM, Xiangdong <epscodes at gmail.com> wrote:
> >
> > Hello everyone,
> >
> > I have a quick question. What is the relationship between da_overlap and
> the width parameter in dmdacreate2d?
> >
> > From the examples, it seems that width=1 works with da_overlap=4. Could
> you please explain the relationship or point me to a reference page?
> >
> > Thanks.
> >
> > Xiangdong
>
>
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