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
> [firstname.lastname@example.org] 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.
> 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.
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