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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.
Unlike the case of exclusive cache, where the unique memory capacity is the combined capacity of all caches in the hierarchy. [4] If the size of lower level cache is small and comparable with the size of higher level cache, there is more wasted cache capacity in inclusive caches.
Unified Memory Access is not a valid term, but is often used mistakenly when referring to: Uniform Memory Access , a computer memory architecture used in parallel computers Unified Memory Architecture , a technology that allows a graphics processing unit to share system memory
In order to hide this memory latency from the processor, data caching is used. [9] Whenever the data is required by the processor, it is fetched from the main memory and stored in the smaller memory structure called a cache. If there is any further need of that data, the cache is searched first before going to the main memory. [10]
Universal memory refers to a computer data storage device combining the cost benefits of DRAM, the speed of SRAM, the non-volatility of flash memory along with infinite durability, and longevity. Such a device, if it ever becomes possible to develop, would have a far-reaching impact on the computer market.
The pure Harvard machines have separate pathways with separate address spaces. Split-cache modified Harvard machines have such separate access paths for CPU caches or other tightly coupled memories, but a unified access path covers the rest of the memory hierarchy. A von Neumann processor has only that unified access path.
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A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. [1] A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations.