[petsc-users] dof of DMDA & DMPlex

[Matthew Knepley]

On Fri, Dec 6, 2019 at 5:46 AM Yann Jobic <yann.jobic at univ-amu.fr> wrote:

> I think i may have misunderstood this discussion :
>
> https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2017-October/033620.html
>

That discussion is about the dimensionality of the problem rather than the
number of dofs at a point.
Regular grids suffer from the "curse of dimensionality".

  Thanks,

    Matt


> best regards,
> Yann
>
> Le 05/12/2019 à 17:23, Jed Brown a écrit :
> > I don't understand the question.  There has never been a limit to the
> > number of dofs per grid point.  Was the email thread referring to
> > spatial dimension?
> >
> > Yann Jobic <yann.jobic at univ-amu.fr> writes:
> >
> >> Hello,
> >> I read in the email archive (from 2016) that, at that time, the number
> >> of synchronized dof (in MPI/ghost cells sense) is 3 or 4.
> >> Is that still the case ? I would like to use PETSc for solving the
> >> Boltzmann equation (via Discreet velocity method, which means a lot of
> >> dof per node).
> >> Is it the same for DMPlex ?
> >> Thanks,
> >> best regards,
> >> Yann
>
>
> --
> ___________________________
>
> Yann JOBIC
> HPC engineer
> IUSTI-CNRS UMR 7343 - Polytech Marseille
> Technopôle de Château Gombert
> 5 rue Enrico Fermi
> 13453 Marseille cedex 13
> Tel : (33) 4 91 10 69 43
> Fax : (33) 4 91 10 69 69
>


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https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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