This is the first time I’ve ever tried to use openmpi on more than a single machine. I have two identical machines running 12.3 x64 KDE, connected to a Gb switch (attached to a router, a telco router, and then the internet) and I want to do openmpi things between these two machines. My main question is how to make sure they can talk to each other - so, what ports need to be opened in the firewalls? Is it just SSH? (I think I saw that default openmpi uses SSH). I have SSHD running on both machines, along with firewall “allowed services” of Samba server, samba client, and SSH (in YaST). In Dolphin, when I click on Network (in Places) I see the workgroup name (whenever both machines are on).
/etc/hosts:
#
# hosts This file describes a number of hostname-to-address
# mappings for the TCP/IP subsystem. It is mostly
# used at boot time, when no name servers are running.
# On small systems, this file can be used instead of a
# "named" name server.
# Syntax:
#
# IP-Address Full-Qualified-Hostname Short-Hostname
#
127.0.0.1 localhost
# special IPv6 addresses
::1 localhost ipv6-localhost ipv6-loopback
fe00::0 ipv6-localnet
ff00::0 ipv6-mcastprefix
ff02::1 ipv6-allnodes
ff02::2 ipv6-allrouters
ff02::3 ipv6-allhosts
I think this may be more than is necessary to get openmpi talking across the Gb switch… Can somebody take a look and mention any problems I might have due to settings I don’t (yet) know about? I will be running openmpi software from the command line (with shell scripts, not using a batch scheduler.) I think I’ll be using the built-in OpenMPI for 12.3, but may occasionally use MPICH2 self-compiled in /usr/local/…
Thanks in advance,
Patti