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VM cluster for MPI runs
From the previous class, you should already have two VMs
with a cluster master host, master, and a compute node, n01:
In the exercises today, we'll do the following steps:
Set passwordless SSH public/private key authentication between master and n01
Add another computational node, n02, by cloning n01.
Run MPI job across three VMs: master, n01, n02.
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