Linux memory full or usage

When linux memory is full or the usage mechanism is used up, it is often said that wdcp occupies a lot of memory, or the memory is used up, will it be suspended? You can say, don't worry, there will be no problem when it is used up, because it is useless or useless at all. In rare cases, it is actually used up. There may be problems. How can we determine whether it is actually used up? In the background of wdcp, choose System Management> memory management. For example, you only need to check the actually used memory rows and check whether the values in the used columns are actually used up in the above table, which is 107, but the physical memory shows 723 but whether it is actually used up is based on the actual memory usage, that is, the actual use is 107 M. Therefore, you can use it with confidence. Why? Because Linux memory and windows memory usage are different, Linux will put some used memory in the cache instead of immediately releasing, but the memory in these caches, it can be used by the program. That is to say, it is the same as the idle memory and can be used or called by the program. So what is the actual memory used on your server? The actual memory usage prevails. If the actual memory usage is exhausted