Minimum initial partition size

Hello

Due to the idiosyncrasies of my initial grid load I may end up with one processor with very few nodes. This has lead to the odd crash where the coarsened graph contained no nodes. In this case the a number of processors had only 1 node. Apologies for not having the stack trace to hand.

However, I did notice the following line in coarsen.c @ 114

ctrl.CoarsenTo = amin(vtxdist[npes]+1, 25*incon*amax(npes, inparts));

Is there a minimum size for the initial number of elements a processor must have? E.g. more than 1!

thanks

Dominic