[petsc-users] How to use command line option for separate matrix

[Barry Smith]

 Yes. You can run with -poisson_ksp_view and -options_left to make sure the options you provide are actually used.

   Barry

On Mar 17, 2014, at 9:39 AM, TAY wee-beng <zonexo at gmail.com> wrote:

> Hi,
> 
> I use
> 
> call KSPSetOptionsPrefix(ksp_semi_xyz,"momentum_",ierr)
> 
> and
> 
> call KSPSetOptionsPrefix(ksp,"poisson_",ierr)
> 
> so that I can choose separate ksp/pc options for my momentum and poisson equations through command line e.g.
> 
> -poisson_ksp_type gmres -poisson_pc_type hypre -poisson_pc_type_hypre boomeramg
> 
> In general, I need to use boomeramg as the preconditioner and gmres as the solver for my poisson eqn, separate from my momentum eqn, which has its own default pc and ksp. Is the above the correct way?
> 
> Thanks!
> 
> -- 
> Yours sincerely,
> 
> TAY wee-beng
>