[Beowulf] MPI & ScaLAPACK: error in MPI_Comm_size: Invalid communicator

[Mark Hahn]

> MPI_Comm_size(82): MPI_Comm_size(comm=0x5b, size=0x80d807c) failed

I have no insight into any of this, except that these parameters 
are obviously reversed.  0x5b is a sensible size, and 0x80d807c
is not.  but 0x80d807c is a sensible pointer...

if this isn't a source-level transposition, perhaps it has to do 
with mixed calling conventions?