[petsc-dev] checking if a vector is ghosted

[Barry Smith]

On Nov 9, 2011, at 5:06 PM, Jed Brown wrote:

> On Wed, Nov 9, 2011 at 16:58, Barry Smith <bsmith at mcs.anl.gov> wrote:
> Error in parallel not sequential.
> 
> Okay, just note that the concept of a local space that is different from a global space is useful even in serial (e.g. ghost points for boundary conditions or periodic). The local form is just the domain of the LocalToGlobalMapping.

  Understood, thus there is the possiblity of user error if they are ghosting but process a non-ghosted vector.  I think the fact that basic stuff runs unchanged on one process with seq (for non-periodic stuff) out ways the risk of this problem.

   Barry