Technically MPI Spec may not put a requirement on TCP/IP, however Open
MPI's runtime environment needs some way to launch jobs and pass data
around in a standard way and it currently uses TCP/IP. That being said
there have been rumblings for some time to use other protocols but that
has not yet come into being.
> *Subject:* [OMPI users] Help: Firewall problems
> *From:* Lee Amy (/openlinuxsource_at_[hidden]/)
> *Date:* 2009-11-05 11:28:50
> I remembered MPI does not count on TCP/IP but why default iptables
> will prevent the MPI programs from running? After I stop iptables then
> programs run well. I use Ethernet as connection.
> Could anyone tell me tips about fix this problem?
> Thank you very much.