Am 14.10.2016 um 23:10 schrieb Mahdi, Sam:

> Hello everyone,
> I am attempting to run a single program on 32 cores split across 4 computers 
> (So each computer has 8 cores). I am attempting to use mpich for this. I 
> currently am just testing on 2 computers, I have the program installed on 
> both, as well as mpich installed on both. I have created a register key and 
> can login in using ssh into the other computer without a password. I have 
> come across 2 problems. One, when I attempt to connect using the mpirun -np 3 
> --host a (the IP of the computer I am attempting to connect to) hostname 
> I recieve the error 
>  unable to connect from "localhost.localdomain" to "localhost.localdomain"
> This is indicating my computers "localhost.localdomain" is attempting to 
> connect to another "localhost.localdomain". How can I change this so that it 
> connects via my IP to the other computers IP?
> Secondly, I attempted to use a host file instead using the hydra process 
> wiki. I created a hosts file with just the IP of the computer I am attempting 
> to connect to. When I type in the command mpiexec -f hosts -n 4 ./applic 
> I get this error 
> [mpiexec@localhost.localdomain] HYDU_parse_hostfile 
> (./utils/args/args.c:323): unable to open host file: hosts

As you mentioned MPICH and their Hydra startup, you better ask at their list:

This list is for the Open MPI implementation.

-- Reuti

> along with other errors of unable to parse hostfile, match handler etc. I 
> assume this is all due to it being unable to read the host file. Is there any 
> specific place I should save my hosts file? I have it saved directly on my 
> Desktop. I have attempted to indicate the full path where it is located, but 
> I still get the same error.  
> For the first problem, I have read that I need to change /etc/hosts manually 
> by using the sudo command to manually enter the IP of the computer I am 
> attempting to connect to in the /etc/hosts file. Thank you in advance.
> Sincerely,
> Sam
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