[petsc-users] Scalable Direct Coarse Solver for PCMG

[Jed Brown]

On Tue, Jan 17, 2012 at 02:31, <domenico.borzacchiello at univ-st-etienne.fr>wrote:

> I'd like to know if the tufo-fischer direct solver is suitable to solve
> saddle problems.
>

Not unless you formulate A^T A which doubles the condition number.

If you need a direct coarse level solver, I suggest using MUMPS or
SuperLU_DIST, semi-redundantly if you have too many processors (e.g.
thousands).
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