What is the difference between multiprocessors and parallel computers?

Multiprocessors and parallel computers are similar in that they both involve multiple processors working together to perform tasks. However, there is a subtle difference between the two.

Multiprocessors refer to a type of computer architecture where multiple processors are integrated into a single system. These processors share a common memory and are tightly coupled, meaning they can communicate and share data quickly and efficiently. In a multiprocessor system, the processors typically work on different tasks simultaneously, but they can also collaborate on a single task if needed.

On the other hand, parallel computers refer to a broader concept where multiple computers or systems are connected together to work on a common task. These computers can be either tightly coupled, similar to multiprocessors, or loosely coupled, where they are connected through a network. In a parallel computer system, each computer or system works on a different part of the task, and the results are combined to achieve the final outcome.

In summary, the main difference between multiprocessors and parallel computers lies in the level of integration and coupling. Multiprocessors are a type of computer architecture with tightly coupled processors, while parallel computers involve multiple computers or systems working together, which can be either tightly or loosely coupled.