I've tried to use ompi-server to connect 2 processes belonging to
different jobs but running on the same computer. It works when the
computer has a network interface up. But if the only active network
interface is the local loop, it doesn't work.
According to what I understood reading the code, it is because no btl
component can be used in this case. "tcp" is not used because usually
it is the "sm" component that is used for processes on the same host.
But in that case it doesn't work because "sm" is supposed to work only
for processes of the same job.
I know that this use-case is not very frequent :)
But Is there a solution to make it work ? or is it a known limitation ?