Very interesting, we are all about making sensible default choices for our
users. We might make MOOSE default to sfc_hilbert for meshes built with
the internal generator. At least until we figure out how to make
Metis/Parmetis work better. I can't even come close to getting this
problem to run on this many processors when using Metis right now. I run
out of memory at about 1/8th this number of cores... More investigation
will be necessary.
Cody
On Wed, Oct 30, 2013 at 8:56 AM, Kirk, Benjamin (JSC-EG311) <
benjamin.k...@nasa.gov> wrote:
> > Thanks Ben! I wasn't even aware of that Partitioner. I just tried it
> on my very large 3D cube domain simulation and it's giving me a 5% boost in
> performance over linear with no other changes. I'm running on 120
> processors across 60 nodes + threading (using tons of memory). I guess the
> communication pattern really makes that much difference. Also, that's a
> low estimate, I have an expensive postprocessor that runs at the end of the
> timestep that's being added into the timestep timer so the actual solve
> performance boost might be closer to 10%!
>
>
> Excellent - that's an old space filling curve partitioner from a Carter
> Edwards class project. It has Hilbert and Morton ordering, but I believe
> Hilbert is the default. For general meshes I'd expect a graph partitioner
> to be a better default, but for cubes and sensical numbers of processors
> the Hilbert space filling curve could be faster.
>
> -Ben
>
>
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