> On May 4, 2017, at 12:10 PM, Hom Nath Gharti <[email protected]> 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
