Relationship between disk cache, virtual memory, page files, and physical memory

Disk cache is divided into read cache and write cache.

Read caching is when the operating system keeps the read file data in the memory space (this memory space is called the "memory pool") when the memory is free, so that the next time the software or user reads the same file again, it does not have to be read again from the disk, thus increasing the speed.

Write caching is actually the data to be written to disk is stored in the memory space allocated by the system for write cache, and when the data saved to the memory pool reaches a certain level, the data is saved to the hard disk. This reduces the actual disk operations, effectively protects the disk from damage caused by repeated read and write operations, and reduces the time required to write.

Virtual memory is the use of hard disk space as memory to make up for the lack of RAM space in the computer. When the actual RAM is full (in fact, before the RAM is full), the virtual memory is created on the hard disk. When the physical memory is used up, the virtual memory manager selects the low-priority portion of the memory that has not been used recently and writes it to the swap file.

This process is hidden from the application, which treats the virtual memory as the same as the actual memory.

A virtual memory file is also a page file.

Please see the specific optimization settings.

Virtual memory is generally set. It depends on the size of the physical memory.

Memory is meant to be used as a cache for computer information processing. There is also a 32-bit system though only displayed. But the actual memory is as much as it can be. So you don't have to worry about running out of memory for this.

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Refers to the space occupied by the cache data in the actual memory of the device.

Physical memory. In the application, naturally, as the name suggests, physically, there are real memory modules plugged into the motherboard's memory slot.

The size of the capacity. When looking at the computer configuration, the main thing to look at is this physical memory. Physical memory.

Physical memory is one of the most important resources on a computer. Windows' memory manager is responsible for allocating memory to active processes, device drivers, and the operating system itself. Because the vast majority of systems have access to far more data and data than physical memory, physical memory is essentially the window through which the data runs.

So memory capacity has an impact on performance, because if the process or operating system needs ** or the data doesn't exist, the memory manager needs to read it from disk.

The cache is the buffer (called the cache) for data exchange, when a piece of hardware wants to read data, it will first find the data it needs from the cache, if it is found, it will be executed directly, and if it cannot be found, it will find the reed code from the memory. Since the speed of the cache is much faster than the memory, the role of the cache is to help the hardware run faster.

Because caches often use RAM (non-permanent storage that is lost when the power is off), files are still sent to hard disks and other storage after they are used up.

in permanent storage. The largest cache in the computer is the memory module, and the fastest is the L1 and L2 cache embedded in the CPU, and the video memory of the graphics card.

It is a cache for the graphics card computing chip, and there is also a 16M or 32M cache on the hard disk.

Physical memory is the memory provided by the memory modules in your computer.

Memory plays a big role in a computer, all the programs running in the computer need to go through the memory to execute, if the execution of a large number of programs or a lot, it will cause the memory to be exhausted. In order to solve this problem, virtual memory technology is used in Windows, that is, a part of the hard disk space is used as memory, and when the memory is occupied, the computer will automatically call the hard disk to act as memory to relieve the tension of memory. For example, if the computer only has 128MB of physical memory, when reading a file with a capacity of 200MB, it must use a relatively large virtual memory, and the file will be stored in the virtual memory after being read by the memory, and then the files stored in the virtual memory will be released into the original installation directory.

We all know that although hard disks are inferior to memory in terms of running speed, memory cannot be compared with hard disks in terms of capacity. When running a program requires a lot of data and occupies a lot of memory, the memory will be "stuffed" and the data that is not used for the time being will be put into the hard disk, and the space occupied by this data is virtual memory. Now we understand why the size changes so often.

Page files. Due to the large consumption of memory, some large-scale software also opens up a part of the hard disk space as a buffer, and the entity of this part of the hard disk space is the page file created by the software, such as Photoshop. This design relieves the pressure on the system's scheduling memory and increases the speed of the software.