[petsc-users] Any suggestion for this kinds of matrix?

[Jed Brown]

On Thu, Nov 10, 2011 at 14:45, Bao Kai <paeanball at gmail.com> wrote:

> PCFIELDSPLIT seems a little more complex, I will try that.
>
> I tried some different preconditioners, only lu can get right results.
>
> With some pc, some wrong results can be obtained, such as the following
> one.
>
> tutorials]$ time ./ex78 -Ain A_in -rhs rhs -solu solu -noshift -pc_type
> hypre -pc_hypre_type parasails -ksp_gmres_restart 600 -ksp_rtol 1e-5
> -ksp_typ gmres
>

Always run with -ksp_monitor_true_residual -ksp_converged_reason when
checking whether a preconditioner is working.
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