HP-MPI User's Guide (11th Edition)

Tuning
Multiple network interfaces
Chapter 5188
Now, when the appfile is run, 32 processes run on host0 and 32 processes
run on host1 as shown in Figure 5-1.
Figure 5-1 Multiple network interfaces
Host0 processes with rank 0 - 15 communicate with processes with
rank 16 - 31 through shared memory (shmem). Host0 processes also
communicate through the host0-ethernet0 and the host0-ethernet1
network interfaces with host1 processes.
host0
host1
shmem
shmem
Ranks 0 - 15
Ranks 16 - 31
Ranks 48 - 63
Ranks 32 - 47
ethernet0
ethernet1
ethernet0
ethernet1