Dear Prof. Bangerth,
Yes, they should really be the same. Or, more correctly, if two processors
> both store the constraints for a node, they better be the same. On the
> other
> hand, of course not every processor will know every constraint.
>

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Thanks you for clarifying this.
Can you try to construct a minimal testcase for what you observe?
Yes, I am going to construct a minimal test case .
Best,
Sambit
On Thursday, August 9, 2018 at 11:33:13 PM UTC-5, Wolfgang Bangerth wrote:
>
>
> > I created a ConstraintMatrix with both periodic and hanging node
> constraints,
> > and called close().
> >
> > Then I pickeda constrained degree of freedom, lets say with global dof
> id =
> > “i” and printed the constraint equation pairs (j,a_ij) corresponding to
> “i” on
> > the processor for which “i” is locally owned as well as the processors
> for
> > which “i” is a ghost. I expected the constraint equation to be the same
> for
> > owning processor and the ghost processor, howeverwe have encountered a
> case
> > where printing the constraint equation entries shows different “j” for
> owning
> > and ghost processorsalthough a_ij are same. When we printed the
> coordinates of
> > “j” which were different, we found that those two nodes to be periodic
> images
> > of each other.
> >
> >
> > Should I except the constraint equation to be the same for the owning
> > processor and the ghost processors?
>
> Yes, they should really be the same. Or, more correctly, if two processors
> both store the constraints for a node, they better be the same. On the
> other
> hand, of course not every processor will know every constraint.
>
> Can you try to construct a minimal testcase for what you observe?
>
> Best
> Wolfgang
>
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bang...@colostate.edu
> <javascript:>
> www: http://www.math.colostate.edu/~bangerth/
>
>
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