[petsc-dev] Attaching DMKSP/SNES/TS with PetscObjectCompose() change

[Barry Smith]

   I would like to add to the _p_DM  struct

PetscObject  dmksp, dmsnes, dmts.

   The current model that uses PetscObjectCompose() is a mis-use of PetscObjectCompose(), why?

The PetscObjectQuery() is always used for every function evaluation in every time step, every Newton step, …

1) this is a performance problem with small size ODEs for example

2) PetscObjectQuery is suppose to be for exceptional things that occur seldomly, not ones that occur inside the main computational routes.

   

   Please send any technical (not philosophical) reasons why making this change is a bad idea and will haunt us later.

   Barry