[petsc-users] Dynamically changing coarse and levels DMMG preconditioners

[Joey Hegarty]

Hi folks,

I'm looking for a way to update the coarse and levels preconditioners used 
during the DMMG solve after PETSc has been initialized.

I can update some options dynamically like so:

        KSP ksp = DMMGGetKSP(dmmg);
        KSPSetTolerances(ksp, ...);
        KSPGMRESSetRestart(ksp, ...);

But I do not see a clear way of updating the coarse and levels preconditioner 
types in a similar way.  Am I missing something obvious?  Apologise if this has 
been asked before.

Cheers,
Joey