[petsc-users] Petsc with ML and ILU

[Lucie Freret]

Hello,

I would like to solve linear systems using Gmres preconditioned by ML  
and use ILU(0) on all levels (mg_coarse and mg_levels_x).
As I have MATMPIAIJ matrix, I'm using
-ksp_type gmres
-pc_type ml
-mg_levels_ksp_type preonly (-mg_coarse_ksp_type preonly)
-mg_levels_pc_type asm (-mg_coarse_pc_type asm)
but I get:
"Running KSP of preonly doesn't make sense with nonzero initial guess"
I tried different keyword to have a zero initial guess but  
unfortunately, I can't solve this problem.
Should I use an other mg_levels_ksp solver of each level or is there a  
way to initialize guess on each level?

Thanks,
Lucie

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