The answer depends on how you have your program set up. If you are using a single program that recognizes based on rank number whether it is a master or slave, then you simply run as normal. For example, if you are running 64 total ranks, using the hostfile ./hosts, you would run:
[plain]mpirun -f ./hosts -n 64 ./a.out <args>[/plain]
If you have one binary for the master and a different binary for the slave, you can use an argument set to run. So if you have 1 master rank and 63 slave ranks, you'd use:
[plain]mpirun -f ./hosts -n 1 ./master <master args> : -n 63 ./slave <slave args>[/plain]
Sincerely,
James Tullos
Technical Consulting Engineer
Intel® Cluster Tools
