On Fri, 20 Nov 2009, Vijay S. Mahadevan wrote:

> I'm still trying to understand what is broken in the xda IO. And is
> this the same format as .xdr ? Is the mesh not written out properly or
> is it not converging to the right solution ? I do not have two version
> of libmesh enabled and disabled with Hilbert but am curious to know
> what is failing in ex10 though.

There's either a bug in reading or in writing - it appears that the
solution on an AMR mesh is getting "scrambled" when read out and back
in.

With the --disable-libHilbert bug, this happens after just one or two
refinement steps.

With the --enable-libHilbert bug, things seem to be okay until after
10 or 11 steps.

> I did a grep on the source files and Hilbert is called only for
> sorting indices in Utility apart from the global_indices() routine.
> That seems harmless enough to not cause any problems in the absence of
> Hilbert. Or may be I missed something else here...

Well, messed up indexing would certainly explain the symptoms I saw.
---
Roy

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