What is a key feature of multiprocessor systems like SMP?

A key feature of multiprocessor systems, such as symmetric multiprocessing (SMP), is that they share a single, common main memory. This architecture allows all processors within the system to access the same memory space, facilitating efficient communication and data sharing among processors. By utilizing a unified memory model, multiprocessor systems can enhance performance and streamline operations, as processors can quickly read from and write to the same memory resources without the need for additional complexity in managing separate memory allocations for each processor.

This shared memory structure enables easier programming models since developers do not have to consider the complexities of managing data across multiple distinct memory spaces, which can be found in other types of multiprocessing systems. Furthermore, this characteristic supports better task scheduling and resource management, as all processors can dynamically access and utilize memory resources.

In contrast, having multiple operating systems, requiring unique memory for each processor, or functioning without shared inputs and outputs are not typical features of SMP, which is designed specifically to leverage shared resources for improved performance and efficiency.