[petsc-users] Suggestion for large scale Poisson's solver

Barry Smith bsmith at mcs.anl.gov
Thu May 4 12:47:04 CDT 2017

> On May 4, 2017, at 12:10 PM, Hom Nath Gharti <hng.email at gmail.com> wrote:
> Dear all,
> I am trying to solve a Poisson's equation on the Earth models with the
> following information
> - Degrees of freedom ~300,000,000
> - I use MPIAIJ matrix
> - Coefficient matrix is symmetric and doesn't change with time steps
> - Need to compute for a large number of time steps
> Which solver/preconditioner is the most efficient for this problem? I
> would be grateful for your suggestion.

   Geometric multigrid is always best if you can use it. If not I would use hypre BoomerAMG, it should have very good convergence.

> Thanks,
> Hom Nath

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