multiprocessor

A multiprocessor system is a computer architecture that utilizes two or more central processing units (CPUs) within a single system to perform tasks concurrently. Traditionally, computers relied on just one CPU—the primary "brain" responsible for executing every instruction. A multiprocessor takes this concept and scales it up, allowing the total workload to be divided among several processors at once.

The power of this system does not come only from having several CPUs inside one machine. It also depends on how well they work together. In the most common use of the word, the processors are part of the same computer and share access to memory and other system resources. The operating system and the hardware coordinate their work so tasks can be split up, scheduled, and completed without the processors getting in each other's way.

Multiprocessor systems are the backbone of demanding applications like scientific modeling (such as weather forecasting or climate research), massive data analysis (big data and machine learning), and high-traffic servers (databases and web hosting). They excel at "parallel processing"—the art of breaking down a giant problem into smaller, manageable parts that different processors can solve at the same time.

Early multiprocessor systems were expensive and often limited to research centers, large companies, or other specialized environments. Over time, similar ideas became more common and more affordable. Today, many computers use multi-core chips, which put several processing cores inside one physical processor. That is not always exactly the same thing as a classic multiprocessor system, but it is closely related and built on the same basic idea: more than one processing unit can share the work. This is part of what allows modern systems to run complex software, serve many users, and respond more smoothly under heavy demand.