Uniform memory access (UMA) is ashared-memory architecture used inparallel computers. All processors in the UMA model share their 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. Uniform memory access computer architectures are often contrasted withnon-uniform memory access (NUMA) architectures. In the NUMA architecture, each processor may use a private cache. Peripherals are also shared in some fashion. The UMA model is suitable for general purpose andtime sharing applications by multiple users. It can be used to speed up the execution of a single large program intime-critical applications.^[1]

There are three types of UMA architectures:

• UMA using bus-basedsymmetric multiprocessing (SMP) architectures;
• UMA usingcrossbar switches;
• UMA usingmultistage interconnection networks.

In April 2013, the term hUMA (heterogeneous uniform memory access) began to appear inAMD promotional material to refer toCPU andGPU sharing the same system memory viacache coherent views. Advantages include an easier programming model and less copying of data between separate memory pools.^[2]

• Non-uniform memory access
• Cache-only memory architecture
• Heterogeneous System Architecture

• Computer memory
• Parallel computing

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