- How to start/stop tasks on other processor? Use ssh?
- How to migrate tasks from overloaded processors to under-used processors?
- How to share page cache? Have kernel and all libraries in each address space?
- How to share input/output? Network, serial lines/keyboards, screens, hard disks?
You may decide to have one processor controlling the other 15, with special access to their memory, but usually that processor will be the weakest link.