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Uniform memory access (UMA) is a shared memory architecture used in parallel computers.All the processors in the UMA model share the physical memory uniformly. In an UMA architecture, access time to a memory location is independent of which processor makes the request or which memory chip contains the transferred data.
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
uniform memory access (UMA): all the processors share the physical memory uniformly; non-uniform memory access (NUMA): memory access time depends on the memory location relative to a processor; cache-only memory architecture (COMA): the local memories for the processors at each node is used as cache instead of as actual main memory. A shared ...
Two known disadvantages are: scalability beyond thirty-two processors is difficult, and the shared memory model is less flexible than the distributed memory model. [4] There are many examples of shared memory (multiprocessors): UMA (uniform memory access), COMA (cache-only memory access). [5]
In the early days a common approach was the use of uniform memory access (UMA), in which access time to a memory location was similar between processors. The use of non-uniform memory access (NUMA) allowed a processor to access its own local memory faster than other memory locations, while cache-only memory architectures (COMA) allowed for the ...
Computer architectures in which each element of main memory can be accessed with equal latency and bandwidth are known as uniform memory access (UMA) systems. Typically, that can be achieved only by a shared memory system, in which the memory is not physically distributed. A system that does not have this property is known as a non-uniform ...
US mulls new curbs on China's access to AI memory chips, Bloomberg News says. July 31, 2024 at 2:13 PM
Tightly coupled multiprocessor systems contain multiple CPUs that are connected at the bus level. These CPUs may have access to a central shared memory (SMP or UMA), or may participate in a memory hierarchy with both local and shared memory (SM). The IBM p690 Regatta is an example of a high end SMP system.