What storage is the cache made of

The composition of this memory is also very complex, because it is composed of many parts.

A computer's memory can be divided into internal memory and external memory. Internal memory is frequently used by computers during program execution and is directly accessible during an instruction cycle. External memory requires a computer to read information from an external storage device, such as a tape or disk.

This is similar to students taking notes in class. If the student knows the content without looking at the note, the information is stored in the "internal memory". If the student has to consult the notes, then the information is in the "external memory".

3] There are many types of internal memory. Random access memory (RAM) is used as a high-speed scratch memory area during computation. Data can be stored, read, and replaced with new data in RAM.

RAM is available while the computer is running. It contains information that is placed at the point where the computer is dealing with the problem at the moment. Most RAM is "unstable", which means that information will be lost when the computer is turned off.

Read-only memory (ROM) is stable. It is used to store the set of instructions that the computer needs when necessary. The information stored in the ROM is hardwired (i.e., it is a physical part of the electronic component) and cannot be altered by a computer (hence the term "read-only").

A variable ROM, called a programmable read-only memory (PROM), can be altered by exposing it to an external electrical device or optical device such as a laser. [3]

The internal memory in a digital imaging device must be large enough to hold at least one digital image. A 512 x512 x 8 bit image requires 1 4 megabytes. As a result, an imaging device that processes several such images requires several megabytes of memory.

So he is also very big to compose.

Cache is a type of cache memory.

Internal memory generally refers to memory. Memory is one of the most important components of a computer, and it is the bridge between external memory and CPU. All programs run in the computer in memory, so the performance of the memory has a great impact on the computer.

Memory, also known as internal memory and main memory, is used to temporarily store computing data in the CPU and to exchange data with external memory such as hard disks. As long as the computer is running, the operating system will transfer the data that needs to be calculated from the memory to the CPU for calculation, and when the operation is completed, the CPU will send the result out, and the operation of the memory also determines the stable operation of the computer. A memory module is composed of a memory chip, a circuit board, a gold finger, and other parts.

Memory is generally coded in semiconductor memory cells, including random access memory (RAM), read-only memory (ROM), and cache. Simply because RAM is the most important memory of them all. (Synchronous) SDRAM Synchronous Dynamic Random Access Memory:

The SDRAM is 168 pins, which is the memory currently used by Pentium models and above.

The answer, of course, is cHigh-speed buffer memory only bridge pure storage, referred to as cache, cache refers to a kind of RAM that has a faster access speed than general random access memory (RAM), with a relatively small capacity but much higher speed than the main memory.

Select C, cache memory. Cache refers to a kind of RAM that accesses faster than the general random access memory (RAM), generally speaking, it does not use DRAM technology like the main memory of the system, but uses the expensive but faster SRAM technology, also has the name of cache memory.

Cache works based on the locality of program access (in layman's terms, it puts frequently used data in a high-speed cache).

Cache memory: Cache memory is a small but high-speed memory that is located between the CPU and the main memory DRAM (Dynamic Random Access Memory), usually composed of SRAM (Static Random Access Memory).

The function of cache is to increase the rate of CPU data input and output.

The performance of the system will be greatly improved by optimizing the scheduling algorithm, as if the storage system capacity is comparable to the memory and the access speed is similar to that of the cache.

Cache typically uses associated memory.

Why should memory be divided into external memory and internal memory? What are the characteristics of each? What is the purpose of cache?

Why should memory be divided into external memory and internal memory? What are the characteristics of each? What is the purpose of cache? ：

The method of pro-memory to be divided into external memory and internal memory is to have certain requirements for the capacity, speed and three basic performance indicators of the memory The characteristics of both are internal memory: fast, power off and empty external memory: slow, the role of cache is to play a buffer between fast and slow memory internal memory:

The speed is fast, and the external memory is emptied when the power is off: the speed is slow, and there is still data when the power is off, and the cache is the cache, which plays a role in the cache between the fast and slow memory In the computer system, there are certain requirements for the capacity, speed and three basic performance indicators of the memory, such as the storage capacity should meet the needs of various applications, and the storage speed of the inspector should match the CPU as much as possible, and support the input and output operations, and the first should be relatively reasonable. However, with the current state of the art, it is not possible to meet these requirements with a single memory with only one storage technology.

The solution is to use a multi-level memory system, i.e., a combination of several storage technologies