[petsc-users] Hypre + openMP

[Michele Rosso]

Hi Jed,

I see what you mean. I am using geometric multigrid and therefore I have a
limit on the number of processors I can use. I was looking for an
alternative and found hypre, but I did not realize that since it's
algebraic multigrid there is no such limitation.
Anyway, let's say I want to keep the geometric multigrid: is there a way to
work around the problem?

Thanks,
Michele
 On May 12, 2015 10:20 PM, "Jed Brown" <jed at jedbrown.org> wrote:

> Michele Rosso <mrosso at uci.edu> writes:
>
> > Thanks Matt,
> > Could you give me an example of not-native partitioning? I have a cubic
> > domain and a 3D domain decomposition. I use dmda3d to create the
> > partitioning.
>
> Are you talking about geometric multigrid (AMG coursening is typically
> irregular)?  Anyway, this is just math: what does it mean to have less
> than one degree of freedom on a level?  Geometric MG on DMDA does have
> requirements, but if you're using Hypre, I don't see why you'd care
> about that.
>
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