The Blue block more specifically is a single CPU on a worker machine.

This enables multiple processes to share a single CPU and is an essential feature of a multitasking operating system.

Similarly for 32 processors it is possible to create 32 partitions at max each having a single CPU.

A single CPU is enough to perform a large screening within hours.

Typical machines of the era used a single CPU to drive the entire system.

Most other multi-user systems of the day used a single CPU to run applications for multiple users which resulted in lower performance.

In such cases, programmers can only get reliable results by locking their code to a single CPU.

In fact, your application probably won't run any faster at all unless it was written to take advantage of more than just a single logical CPU.

On a single CPU, only one task executes at any given time.

Obviously, this will be faster than doing it on a single CPU.