[petsc-users] Increasing ILU robustness

[Jed Brown]

Hugo Gagnon <opensource.petsc at user.fastmail.fm> writes:

> Hi,
>
> I'm getting a KSP_DIVERGED_INDEFINITE_PC error using CG with ILU.  I
> tried increasing the number of levels of fill and also tried other
> options described in
> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCILU.html
> but without any luck.  Are there some other preconditioner options
> that might work?

What kind of problem are you solving?  How does this work?

  -pc_type gamg -pc_gamg_agg_nsmooths 1