For anyone interested in running a cluster, but in a significantly smaller (cheaper, less powerful) form factor, I use the 8086 ClusterHAT. It supports 4 Raspbe

For anyone interested in running a cluster, but in a significantly smaller (cheaper, less powerful) form factor, I use the 8086 ClusterHAT. It supports 4 Raspberry Pi Zeros hosted on a Raspberry Pi 2, 3 or 4. Of course the four zeros together are only as powerful as the host (quad-core vs single core), this setup is great for learning mpi and other super computing concepts. It is definitely not meant for industrial use, but is definitely good for the educational aspects. I have used it as a personal network of vulnerable machines with a firewall (the host pi) to demonstrate hacking techniques. That's not what the ClusterHAT was designed for, but it is super-easy to set up for classroom use like that. https://clusterhat.com/ https://clusterhat.com/