The first stage:
Single CPU, nothing to say. It's about the same as the desktops we play games on today.
second stage:
Dual-CPU or multi-CPU SMP architecture or AMP architecture. Reference: http://www.lauterbach.com/smporamp.pdf
The third phase:
Since there is a shared access conflict in the second stage, in order to ensure that the efficiency is also improved when the number of CPUs increases, the NUMA architecture is introduced. The essence is that multiple SMP architectures are loosely coupled, and the multiple SMPs are interconnected using the Crossbar Switch high-speed switching matrix.
Fourth stage:
MPP