[petsc-users] Multigrid preconditioner parameters

[Jed Brown]

Feng Xing <snakexf at gmail.com> writes:
> I want to use the the multigrid preconditioner in Petsc/hypre library
> to a finite element elliptic problem. But there are a lot of
> parameters. I would to ask if some of them are important for the
> convergence and the computation time.

Yes, some of them are important.  We can't comment without further
information on your problem, but custom tuning of solvers for each
problem encountered by each user is not scalable for the PETSc
developers, so we recommend that you consult the Hypre manual (if you're
using Hypre) and experiment with the usual tuning parameters (e.g., the
"strong threshold" discussed in the manual).  When you have more
experience with the problem you're solving and the behavior of the
parameters, feel free to write with more specific questions.
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