[petsc-users] Increasing ILU robustness

[Hugo Gagnon]

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?  The solution converges nicely with petsc's cg + lu and sparskit2's iluk on an independent cg serial solver.

Thanks,
--
  Hugo Gagnon


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