In each case, theres at least one node that has two IP addresses (and potentially two IP names) — which one should be used in the LAM boot schema?
The answer is to use the IP name/address that refers to the NIC that you want LAM to use for TCP/IP communication (both LAM “meta” information and MPI message passing). LAM will use the NIC associated with the name/address used in the boot schema file. For example, in the first scenario above, the master node should be represented in the boot schema file with the IP address/name of its NIC on the private network. In the second scenario, the IP address/name of each node’s 100Mbps NIC should be used to get maximum bandwidth for message passing. Note that LAM can work fine in the first scenario if you specify the IP name/address of the NIC on the public network if the networking on the master node is configured to route traffic from the private network to the public network (usually behind Network Address Translation, or NAT). This is usually not a good idea, however, because it effectively causes extra network hops for traffic from the slave nodes to the master node, and therefore adds l
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