A multiprocessor system is any device with multiple processors(processing cores).
These days, you can buy up to an 8 core PC, (apple's new mac pro) http://blogs.zdnet.com/Apple/?p=485
But most people with gaming PC's have at least a duo-core processor. They used to be very expensive, but now they are affordable. But you'll usually hear that term associated with PC or computing devices. It makes everything faster, especially multitasking.
In the context of operating system build types, "multiprocessor free" refers to an operating system build that does not support multiprocessor systems. This means it is designed to run on single-processor systems only. On the other hand, "multiprocessor kernel" refers to an operating system build that supports multiprocessor systems, allowing for parallel processing and improved performance by utilizing multiple processors simultaneously. The inclusion of a multiprocessor kernel enables the operating system to take advantage of the capabilities offered by multiprocessor hardware configurations.
The difference between distributed system and multiprocessor system is whether the processing units in the system share the main memory. If yes, then the system is multiprocessor system; otherwise, it's a distributed system.
A cluster system consists of multiple independent computers connected together, each with its own operating system and resources, while a multiprocessor system has multiple processors sharing the same memory and operating system. In a cluster system, each node operates independently and communicates through a network, whereas in a multiprocessor system, all processors share the same memory space and can access shared resources more efficiently. Clusters are typically used for high availability and scalability, while multiprocessor systems are designed for high performance and parallel processing tasks.
Multiprocessor systems have gained popularity over the years as they allow the user to do more than they could with a single processor system. Xbox 360, CELL, and Sequent are examples of multiprocessor systems.
Multiprocessor
A multithreaded system comprising of multiple user-levelthreads cannot make use of the different processors in a multiprocessorsystem simultaneously. The operating system sees only a single processand will not schedule the different threads of the process on separateprocessors. Consequently, there is no performance benefit associatedwith executing multiple user-level threads on a multiprocessor system.
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Multiprocessor Operating Systems
In multiprocessor systems, failure of one processor will not halt the system, but only slow it down by sharing the work of failure system by other systems. This ability to continue providing service is proportional to the surviving hardware is called graceful degradation.