title: Specify the machines running program using MPI
body: <p>I am going to do some parallel computing and I'm totally a beginner in this area. I will use MPI to do the parallel work, with Master-Slave model. I now have four machines and want one of them to be the Master Node. However, I don't know how to specify the other machines running the program. Is there a way like specifying the IP address of slave node? How to launch my program? I'm using Ubuntu 12.10.</p>