Unix itself is ~20 years older than Linux's start. NextStep implemented Unix atop a microkernel for security benefit. Hurd splits all the subsystems of Unix i

Unix itself is ~20 years older than Linux's start. NextStep implemented Unix atop a microkernel for security benefit. Hurd splits all the subsystems of Unix into independent facilities that are connected via the microkernel. One of them can crash and not affect the rest of the system, but also I got the idea reading about Hurd that there's no particular requirement one subsystem lives on a specific CPU or even machine as long as they can communicate. Maybe I'm thinking of Plan 9?