"Smith, Barry F. via petsc-dev" <petsc-dev@mcs.anl.gov> writes:
> It seems reasonable at SetUp time to make it 1. If we need to have the > information that user never set it (I don't know why we would want this) then > that can go into a new flag. I think I recall code paths in which the blocksize is set after PetscLayoutSetUp, and allowed so long as it's compatible with the sizes. It's possible that those are no longer relevant.