You can create a communicator for the hydrodyamics processor, and use
that communicator instead of MPI_COMM_WORLD. Technically, your question
was not LAM-specific, but a general MPI question.
Jonathan
ertheriault_at_[hidden] wrote:
> 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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