So I have followed this tutorial on how to make a Raspberry PI cluster computer. It works great, I can parallel my processes with MPI, but I'm also wondering if this is possible. Currently, all four of my Pis are running the same thing at the same time, but it doesn't look like they're helping each other out with computing power. If they are, and I'm confused about how this whole thing works, forgive me. But to me, it looks like pi@client is running the same thing, as is pi@node01, pi@node02, pi@node03, etc. Which is fine, unless I want to pool that power. Any clarification and help would be great, thanks.
NOTE: only the green activity light on the client is flashing
MPIExec Example: mpiexec -f machinefile -n 4 echo Test
EDIT: If I change my -n tag in mpiexec, will that run it as a singular process as in all computers are contributing, or only one is doing the work?