> > > What "global idea"? Even with something simple like DMDA the "global > idea" of a variable depends on the number of processes, similarly if one is > doing any kind of partitioner on the unknowns the ordering changes with the > number of processors. > >
The point is that it is possible to have a process invariant test, as opposed to impossible. PETSc's MIS is not invariant now anyway. I don't think about DMDA; the problems that I have experience with have a global numbering that can be preserved if one wishes for debugging.
