What part of the data in the cache is the mapping of the content?

The data in the cache is a mapping of the contents of the "memory" part. The speed of the CPU is much higher than that of the memory. When the CPU directly accesses data from the memory, it has to wait for a certain period of time. The Cache can save a part of the data that the CPU has just used or recycled. If the CPU needs to use this part of the data again, it can Called directly from Cache.

#The operating environment of this article: windows10 system, thinkpad t480 computer.

Inside the CPU, the data in the cache is a mapping of the contents of the "memory" part.

Cache memory is a high-speed cache memory in a computer. It is a small but high-speed memory located between the CPU and the main memory DRAM (Dynamic Random Access Memory). It is usually composed of SRAM ( Composed of Static Random Access Memory (static memory). It is a small-capacity but high-speed memory located between the CPU and the memory.

The speed of the CPU is much higher than that of the memory. When the CPU directly accesses data from the memory, it has to wait for a certain period of time, while the Cache can save a part of the data that the CPU has just used or recycled. If the CPU needs to access data again, When using this part of the data, it can be called directly from the Cache, thus avoiding repeated access to data and reducing the waiting time of the CPU, thus improving the efficiency of the system. Cache is divided into L1Cache (level one cache) and L2Cache (level two cache). L1Cache is mainly integrated inside the CPU, while L2Cache is integrated on the motherboard or CPU.

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.

Because it is necessary to ensure that the data cached in the Cache is consistent with the content in the memory, the write operation of the Cache is relatively complex. Commonly used methods include the write-through method, the write-back method, and the marking method.

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