On 13 Mar 2014, at 14:01, Anders Logg <[email protected]> wrote:

> On Thu, Mar 13, 2014 at 07:55:55AM -0600, Jed Brown wrote:
>> "Garth N. Wells" <[email protected]> writes:
>>>> Adding it to Variable would work. It would cost nothing and be easy to
>>>> implement.
>>>> 
>>> 
>>> It would not work at all. MPI initialisation must be collective.
> 
> I don't understand - how would it be different from today when MPI is
> initialized via the base class PETScObject?
> 

I think you need to read a book on MPI :).

Until very recently, we assumed that PETScObjects were distributed, i.e. 
creation was a collective operation.

Garth

> --
> Anders

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