What does allocation unit size mean?

The allocation unit size refers to the size of the memory block allocated to each object or data structure in computer memory management. It is an adjustment made to optimize memory utilization and improve program performance. In PHP, allocation unit size is very important for memory management and garbage collection. It determines the memory size occupied by each variable or object. If it is too small, it may cause memory fragmentation, and if it is too large, it will waste memory resources. Therefore, understanding and setting the appropriate allocation unit size is crucial for performance optimization of PHP programs. PHP editor Banana will introduce the concept of allocation unit size and its application in PHP in detail.

What is the appropriate allocation unit size? Answer:

Answer: The allocation unit size means the system’s allocation of disks and various mobile storage devices. The smallest unit for reading and writing.

The larger the allocation unit size, the faster the read and write speed of the disk.

Generally speaking, the smaller the allocation unit, the more space it saves. The larger the allocation unit, the more time it saves reading, but it wastes space.

It seems that smaller allocation units can save space. In fact, this is not the case.

The more blocks a file is divided into, especially when these storage units are scattered, the data has just been read. Some time will be wasted. You can imagine that time is wasted when the magnetic head is struggling to move the disk for bit by bit of data.

Therefore, I recommend that you keep the system's default allocation unit size.

Allocation unit sizes, you will find 4096 bytes (4K), 8192 bytes (8K), 16K, 32K, 64K. Which size to choose depends on the application. When installing applications with a lot of small files,

such as common system areas and U disks, it is best to choose 4K size to save space. For storage purposes, especially for applications that contain a large number of large video files such as movies, it is better to choose 32K or 64K, which can increase the reading speed.

For example, let’s see if you can understand

The floor area of ​​your home = partition capacity

Your home plans to lay floor tiles. It is equal to the allocated unit size

Both large-sized and small-sized tiles can cover your home, so what is the difference between large and small?

The disk does not write files one by one, it is divided into countless grids. A file is continuously written on the disk. In the last grid where the file was written, no matter whether there is still space in this grid, if the file is changed, a new file will be written in another grid.

Small size does not waste disk, space utilization is high, speed is slower, large size is fast, but space is easily wasted

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