Damn - this sounds subtle, and good catch. I'll have a look but it may be mid 
week before I can do anything useful. 

-Ben



On May 18, 2012, at 6:39 PM, "Roy Stogner" <royst...@ices.utexas.edu> wrote:

> 
> Todd Oliver found and partially tracked down an ugly bug; I think I've
> got it pinned down to a libHilbert interface issue.
> 
> A test code which breaks is attached.  Originally we had to do some
> refinement to trigger the problem but now literally all it does is
> generate a 1D mesh and write it out.  The first argument is the number
> of elements.  1 through 3071 work.  3072 (and many other larger mesh
> sizes, sparsely scattered...) fails.
> 
> Todd triggered the bug at a tot_val_size assertion in the I/O code,
> but the underlying problem turns out to be duplicate HilbertIndices
> leading to duplicate renumbered node ids.  I've updated the svn head
> to test for duplicate HilbertIndices and print them out as soon as
> they're found in MeshCommunication::assign_global_indices().
> 
> I'm still not sure *why* the duplicate indices are occuring, and I'm
> at the point where more eyes might be helpful.
> ---
> Roy
> <refinement_test.C>

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