So we have a user that wants to try to start using the "recover" capability in MOOSE to resume a long running simulation on the clusters. This particular simulation is very large and the user is using nemesis output. I was suprised to see that we don't have any nemesis appending tests in all of MOOSE. It appears that all of our nemesis output is on "steady-state" solves, or the recover flag has been explicitly set to false on any transient simulations checked in. When I went to test this capability it did fail with a seg fault and pointed to this line of code:
https://github.com/libMesh/libmesh/blob/master/src/mesh/nemesis_io_helper.C#L2485 I verified that the "exodus_node_num_to_libmesh" structure was empty. I can see that at least an attempt has been made to support the "append" functionality in Nemesis but does anyone know for sure that it works? It appears that we might be missing some initialization call or something? Full disclosure - We have additional wrappers around Exodus and Nemesis in MOOSE but they aren't doing anything that I would consider illegal or bad. Those wrappers are creating and using the main Exodus and Nemesis objects through the public API. Before I (or someone else) dives in, do we expect this case to work? Anyone else doing Nemesis appends? Thanks, Cody
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