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Diagram of a symmetric multiprocessing system. Symmetric multiprocessing or shared-memory multiprocessing [1] (SMP) involves a multiprocessor computer hardware and software architecture where two or more identical processors are connected to a single, shared main memory, have full access to all input and output devices, and are controlled by a single operating system instance that treats all ...
Multiprocessor system with a shared memory closely connected to the processors. A symmetric multiprocessing system is a system with centralized shared memory called main memory (MM) operating under a single operating system with two or more homogeneous processors. There are two types of systems: Uniform memory-access (UMA) system; NUMA system
Systems that treat all CPUs equally are called symmetric multiprocessing (SMP) systems. In systems where all CPUs are not equal, system resources may be divided in a number of ways, including asymmetric multiprocessing (ASMP), non-uniform memory access (NUMA) multiprocessing, and clustered multiprocessing.
Sequent Computer Systems was a computer company that designed and manufactured multiprocessing computer systems.They were among the pioneers in high-performance symmetric multiprocessing (SMP) open systems, innovating in both hardware (e.g., cache management and interrupt handling) and software (e.g., read-copy-update).
The system was the first truly symmetric multiprocessing machine to use virtual memory, it was also among the first machines to implement what is now known as a translation lookaside buffer, [2] [3] [4] the foundational patent for which was granted to John Couleur and Edward Glaser. [5]
The system interface controller supports glue-less symmetrical multiprocessing (SMP) of up to four microprocessors. Systems using the R10000 with external logic can scale to hundreds of processors. An example of such a system is the Origin 2000.
An asymmetric multiprocessing (AMP or ASMP) system is a multiprocessor computer system where not all of the multiple interconnected central processing units (CPUs) are treated equally. For example, a system might allow (either at the hardware or operating system level) only one CPU to execute operating system code or might allow only one CPU to ...
The Pluribus software implemented MIMD symmetric multiprocessing. Software processes were implemented using non-preemptive multiprogramming. Process scheduling used a hardware device, called the pseudo-interrupt device or PID, that was accessible to both programs and to I/O devices. Each processor ran its own copy of the process scheduler ...