What is the role of cache in the computer storage system?

In the computer storage system, the role of cache is to increase the speed of the storage system.

Cache introduction:

Cache memory: Cache memory in the computer is located between the CPU and the main memory DRAM (Dynamic Random Access Memory). Small-scale, but very high-speed memory, usually composed of SRAM (Static Random Access Memory).

The function of Cache is to increase the rate of CPU data input and output. Cache capacity is small but fast, memory speed is low but capacity is large. By optimizing the scheduling algorithm, the performance of the system will be greatly improved, as if the storage system capacity is equivalent to the memory and the access speed is similar to the Cache.

Cache usually uses associative memory.

Basic principle:

The basis for using Cache to improve system performance is the principle of program locality.

Technical analysis:

One of the development trends of PC systems is that the CPU frequency is getting higher and higher, the system architecture is becoming more and more advanced, and the structure of the main memory DRAM and access times improved more slowly. Therefore, Cache technology is becoming more and more important, and Cache is getting bigger and bigger in PC systems. The majority of users have regarded Cache as an important indicator when evaluating and purchasing PC systems. Cache can be used as a match to adjust the gap between devices with large differences in transmission speed, or in other words, it is the transmission channel of these devices. Cache technology is required in display systems, hard disks and optical drives, as well as network communications.

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