Hi, I am trying to understand how connections are established among MPI ranks. Pardon for the list of questions.
1) Is there a global data structure that creates and stores rank to network address (uri or port number) mapping 2) How is the location of an MPI rank is determined in point-to-point operations such as MPI_Send. Logically, given a rank, there has to be a look-up to get its address and pass this information to lower levels to use a send operation with this destination address using appropriate network protocol. 3) Are the connections among ranks pre-established when a communicator is created or are they established on-demand. Where exactly in the source code is this connection created (I'm tracking ompi_mpi_init(), so think it must be in orte_init(), not sure though). 4) Does the communicator attribute (c_keyhash) store this mapping information, or is this totally different? Best, Marc
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