Examine how to configure Secure Shell on IBM System p and System x computers to run commands in parallel in a cluster without being prompted for a password. This will allow you to perform activities more easily and quickly, and gives you flexibility to perform activities in parallel on more machines.
This article is taking two simple tools(ssh-keygen and dsh) and making it seem like some insane powerful parallel clustering tool.
In fact, the computers do not need to be System x or System p, or even IBM.
I use them all the time, for my non-clustered computers to do things like upgrading and installing new packages in parallel.
I don’t see anything happening in parellel in this article. Sequential, yes. Parallel, no. To do things in parallel, you would need to background the processes, keep a list of jobs, and then as each job completes, you would probobly want to format the output so that each host’s output is tagged with the host name.
Download dsh from http://www.netfort.gr.jp/~dancer/software/dsh.html and it can run the commands in parallell.
Another nice application is c-term( http://www.debian.st/~victor/index.php?page=projects ) which can duplicate your input to several terminals(using XSendEvent)