I have a parallel setup of 6 identical machines with Linux mint 18, ssh and
openmpi.

when i execute this,
mpiexec -np 16 --hostfile mpi-hostfile namd2 apoa1.namd > apoa1.log
with following host file
localhost slots=4
slave1 slots=4
slave2 slots=4
slave3 slots=4
slave4 slots=4
slave5 slots=4

it gives error
ssh: Could not resolve hostname slave3: Temporary failure in name resolution
ssh: Could not resolve hostname slave4: Temporary failure in name resolution
ssh: Could not resolve hostname slave5: Temporary failure in name resolution

and if comment slave3,4,5 and run mpiexec -np 12.... it works fine

if I changed the order, then it runs with first 3 host names.

is there any limitation with openmpi? or any idea to solve this?

-- 
kind regards,
-Madhuranga Rathnayake | මධුරංග රත්නායක-
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