The hierarchy of the storage system

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Time of issue:2021-06-26 13:07
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　　In order to improve the performance of the memory, the memory of various storage capacities, access speeds and prices are usually organized into a multi-layer memory according to a hierarchical structure, and the management software and auxiliary hardware are organically combined into a unified whole to make the stored programs and data Distributed in each memory according to levels.

　　The storage system is mainly composed of a three-level hierarchical structure, which is composed of a high-speed cache memory, a main memory and an auxiliary memory. In the figure, the capacity gradually increases from top to bottom, the speed is gradually reduced, and the cost is gradually reduced.

　　The whole structure can be seen as two levels: main storage and auxiliary storage and Cache-main storage. Under the management of auxiliary hardware and computer operating system, the main storage and auxiliary storage can be regarded as a storage unit, and the addressable storage space formed is much larger than the main storage space. Due to the large auxiliary storage capacity and low price, the overall average price of the storage system is reduced. Cache-main memory level can narrow the speed gap between main memory and CPU, and improve the access speed of the memory system as a whole.

　　A larger storage system is composed of various types of storage devices, forming a storage system with a multi-level hierarchy. This system not only has a speed similar to that of a CPU, but also has a great capacity, and the price is relatively low. It can be seen that a memory system with a multi-level hierarchical structure can effectively solve the contradiction between the speed, capacity and price of the memory.

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Next: What is the status quo of semiconductor memory chips in my country?

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