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Add Master / Slaves to RPC framework

Sometimes we see the relationships of our process as

  • clients - server (n to 1)
  • master - slaves (1 to n)

Here we introduce the Master / Slaves schema:

  1. The world communicator is split according to process role (master or slave)
  2. Commands are broadcasted to every slaves, e.g. MPI_Bcst
  3. Result values are reduced, e.g. MPI_Allreduce in the slaves intracommunicator using a "consensus" function
  4. Slave leader sends the result to master, e.g. MPI_Send