[petsc-users] Setting GAMG options C code

[Harshad Sahasrabudhe]

>
>           ierr = PetscOptionsSetValue(NULL, "-st_mg_levels_ksp_type",
>> "chebyshev");
>>           chkerr(ierr);
>>           ierr = PetscOptionsSetValue(NULL, "-st_mg_levels_pc_type",
>> "jacobi");
>>           chkerr(ierr);
>>           ierr = PetscOptionsSetValue(NULL, "-st_mg_levels_ksp_max_it",
>> "8");
>>           chkerr(ierr);
>>           ierr = PetscOptionsSetValue(NULL, "-st_pc_gamg_threshold",
>> "0.01");
>>           chkerr(ierr);
>>
>
> I have a different opinion than Jose. I think the above lines are a better
> way to lock in the setup.
>
> 1) It is very difficult to get the order correct when you use the API
>
> 2) For deeply nested solvers it can be either inflexible (you assume a
> structure) or laborious (since
> you check for certain structures at each level)
>
>   Thanks,
>
>     Matt
>

Thanks Matt! I will use it by setting options. I have one question though:
What happens if there are 2 conflicting options?
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