I need to specify -iface br0 to run on mic's [SOLVED]

[Anders_H_]

Hi,

As explained in https://software.intel.com/en-us/forums/intel-many-integrated-core/topic/602095, in order to run native mode on my Xeon Phi cards, I need to specify -iface br0 (or -iface virbr0) when running mpirun. If I don't I get the errors mentioned in the link:

    [proxy:0:0@kif-mic0] HYDU_sock_connect (../../utils/sock/sock.c:268): unable to connect from "kif-mic0" to "127.0.0.1" (Connection refused)
    [proxy:0:0@kif-mic0] main (../../pm/pmiserv/pmip.c:415): unable to connect to server 127.0.0.1 at port 35690 (check for firewalls!)

So two questions: 
1) why doesn't it work without specifying an interface?
2) is it possible to set default -iface globally?

[Artem_R_Intel1]

Hi Anders,

The root cause of the problem is specific network settings. Could you please try the solutions suggested in the topic Cannot start MPI job from host system: '-localhost' option or correct network settings (for example via /etc/hosts editing). Alternatively you can use '-iface' option or corresponding I_MPI_HYDRA_IFACE environment variable.

[Anders_H_]

Hey,

Thanks for the quick reply. In my host's /etc/hosts, I had a line [kif is the host]:
127.0.0.1 kif

and by removing that, everything works as normal. Not really sure why or when I added that line.

Thank you so much!