Matt Leininger wrote:
Requiring IPoIB to be running for MPI to work is a new dependency that
users are not accustomed to. Maybe we need to do this through the cm
rather than rdma_cm. We shouldn't require IPoIB to be running for MPI
to use IB.
Use of these new features already carries with it new dependencies, in the form
of new libraries and kernel modules.
Are MPI users even accustomed to having the IB CM loaded?
How does MPI discover the remote nodes in the fabric today? How does it obtain
the path records? How does it use multicast groups today?
I'm trying to find a solution that can be both easy to use, yet allow for low
level control. However, I don't necessarily want to restrict an implementation
based on existing applications that are either hard-coded or coded for static
configurations.
- Sean
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