Solve a symmetric matrix

[LECAS Dimitri]

Hi,

I try to solve a symmetric problem, i use MatCreateMPISBAIJ for the
matrix  but i have an error message about the preconditioning (PCILU).
With the option -pc_type none, i have big problem with convergence
(residual > 1e32). So my question is what the option (for ksp and pc) to
use for symmetric problem.

I not sure i understand the meaning of block size in MatCreateMPISBAIJ,
i set it to 1.

Best Regards.
-- 
Dimitri Lecas