[mpich-discuss] How does hyday works?

[Dorier, Matthieu]

Hi,

I'd like to have a better understanding of how Hydra works and how MPI processes "discover" how to connect to one another. I'm guessing something roughly like this happens:

- mpiexec launches and ssh connection to each node, and sets some environment variables that will indicate to the created processes how to connect to one another;
- MPI processes are created, and when calling MPI_Init they read the right environment variables to build MPI_COMM_WORLD.

Is this correct? If so, where could I find information about the environment variables at play?

Thanks,

Matthieu
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