Hierarchical memory
Hierarchical memory also known as multi-level memory. The organization of memory in several levels of varying speed and capacity such that the faster memories lie close to the processor and slower memories lie further away from the processor. Faster memories are expensive, and therefore are small. The memories that lie close the processor store the current instruction and data set of the processor. When an object is not found in the memories close to the processor, it is fetched from the lower levels of the memory hierarchy. The top levels in the hierarchy are registers and caches. And the lowest level in the hierarchy is the backing memory, which is usually a disk.
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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