I am facing difficulty in executing MPI program on two machines. The OS is Ubuntu 12.04. And the MPI implementation is MPICH2
ssh is working fine:
root@ubuntu:/home# ssh 192.168.1.9
root@gpuguy's password:
Welcome to Ubuntu 12.04.3 LTS (GNU/Linux 3.8.0-29-generic i686)
* Documentation: https://help.ubuntu.com/
131 packages can be updated.
67 updates are security updates.
Last login: Thu Oct 24 17:36:25 2013 from ubuntu.local
root@gpuguy:~#
But when I run my MPI programs it fails:
root@ubuntu:/home# mpiexec -f hosts.cfg -n 4 hello
[email protected]'s password:
[proxy:0:0@gpuguy] HYDU_sock_connect (./utils/sock/sock.c:171): unable to get host address for ubuntu (1)
[proxy:0:0@gpuguy] main (./pm/pmiserv/pmip.c:209): unable to connect to server ubuntu at port 42104 (check for firewalls!)
I have already disabled firewall on both machines that is the reason I can do ssh successfully. But how to solve this issue?
My MPI code runs successfully on single machine.
For MPICH (or any MPI implementation) to work, you need to have passwordless SSH set up. I should also mention that you really shouldn't have to be logged in as root to make this work. It's generally a very bad idea to be logged in as root all of the time.