[petsc-users] jacobi before ilu with shifting

[SUN Chun]

Hi Petsc dev,

 

I couldn't figure out this preconditioner setting... I want to do BJACOBI + ILU on each block with shifting, but before ILU I want to apply a diagonal scaling to my LHS. What I've been trying to do is:

 

-pc_type bjacobi

-sub_pc_type composite

-sub_pc_composite_type multiplicative

-sub_pc_composite_pcs jacobi,ilu

 

then I don't know where to add -pc_factor_shift_positive_definite I've tried adding "sub_", "sub_pc_composite_" prefixes to that but non worked.

 

I wonder if the whole idea of using composite is wrong. Where should I scale it? Where should I specify shifting?

 

Thanks,

Chun



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