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Compacting id numbers
The cmiss backend (cm) uses a memory management model where it allocates all the memory it is going to need at once based on the node and element id numbers (is that right? yep - node and element numbers are simply indices into the various arrays rather than actual identitifiers).
This means that if you have a mesh with only 2 nodes numbered 10001,10002 then cm will allocate enough memory for 10002 nodes even though your problem has only 2 nodes. Therefore to minimise the memory required by the backend it is necessary to renumber nodes and elements so that the id numbers are in a contiguous block starting at 1.
This can be done with the front end command gfx change_identifier.