Re: [Libmesh-users] xdr file format

[Roy S. <roy...@ic...>]

On Wed, 19 May 2010, Tim Kroeger wrote:

> When I now read in results that have been written with the old
> version, I get completely wrong results.  If I re-run the simulation
> and then read in the result, everything is fine again.  Hence, I
> assume that there has been a format change in the xdr files; can this
> be?  If yes, is there any way to read in files that have been written
> in the old format?  That would be very useful for me since otherwise I
> would have to repeat quite a lot of simulations.

There's been an ordering change in the xdr files.  We ran into a bug
in our libHilbert interface (responsible for providing a consistent
node/DoF ordering for I/O) a while back which could cause assertion
failures in dbg mode or corruption of output files in opt mode. (very
infrequently, but of course any probability above 0% is too high for
such a nasty bug)  So --disable-libHilbert is now the default until we
get that fixed.

Ben's the one most qualified to fix it, so I've left that on his
plate, but he's been swamped lately; apparently the Space Shuttle
takes precedence for some reason.  ;-)

But we should at least get the new code properly reading old files.
Would you mind helping out with that, since you've already got a
failure case prepared?  I'll try to get things working on a small test
case myself this week, and I'll let you know when the svn head is in
shape to take a crack at your own old files.
---
Roy