Should PetscObjectName be collective?

[Jed Brown]

Barry Smith wrote:

>    I do not know a way to generate unique MPI-comm-id's. Any thoughts?
> Some feature of MPI I don't know?

This seems very hard.  One could (the first time PETSc sees a
communicator) hash the hostname+pid of every process on the
communicator, start a counter on this hash, and set the communicator
name to be the hash concatenated with this counter.  I think this is
sufficient, but it's kinda nasty.

Jed

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