[petsc-users] Automatic partition of Cartesian grids

[Jed Brown]

On Fri, Nov 11, 2011 at 08:26, TAY wee-beng <zonexo at gmail.com> wrote:

> However, it seems that there are better ways to do it to get a more
> balanced load. Do I use DMDA in PETSc to do it? I'm now using staggered
> Cartesian grids for my u,v,p. Is there an example to construct a
> Laplace/Poisson equation using DMDA?
>

src/snes/examples/tutorials/ex5.c (Bratu problem, simple nonlinearity added
to Poisson)

See also

src/snes/examples/tutorials/ex50.c (thermal/lid-driven cavity)


>
> It is mentioned in the manual that DMMG infrastructure will be replaced in
> the next release and we should not use it. Is this related to DMDA?
>

DMMG used DM (the algebraic interface implemented by DMDA). DMDA is
recommended, but don't write new code with DMMG.
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