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

[Barry Smith]

> 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