How are processor usage limitations related to computer architecture?

The limitations on the number of processors used are directly related to the computer's architecture and operating system. Physically, a computer can have a certain number of processor cores, and software cannot utilize more cores than are available.

Additionally, architecture may impose restrictions on parallelism due to features of the data bus, cache memory, and synchronization between cores. In Go, for example, you can set the maximum number of processors used simultaneously via runtime.GOMAXPROCS, but it cannot exceed the number of available cores.

Thus, the limitations are determined by hardware resources, architectural features, and runtime environment settings.