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. 
>

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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