Hi, I'm writing a program that uses many computers to calculate the
hydrodynamics of a system and one computer to calculate the
gravity-related parts. I've been using calls like mpi_bcast and
mpi_allreduce to share the particles' hydrodynamic information between
machines, but this, as far as I know, requires the participation of the
gravity computer along with the other machines. I do not want the gravity
computer to waste time with communication about the hydrodynamics. I was
wondering if there are functions like mpi_bcast that can give information
to all the processors except one. Or perhaps there's another way to do it
using these calls in a different way? Thanks very much.
Eric
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