Article Title: how to view memory usage in Linux. Linux is a technology channel of the IT lab in China. Some basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source are included. It is very easy to view memory usage in Windows systems. I think everyone is familiar with it, in linux, how does one view memory usage? The following is a free command for checking memory usage in Linux:
The following is an explanation of these values:
Total: total physical memory size.
Used: used.
Free: available.
Shared: The total memory Shared by multiple processes.
Buffers/cached: disk cache size.
Row 3 (-/+ buffers/cached ):
Used: used.
Free: available.
The fourth line won't be explained much.
Difference: used/free of the second row (mem) differs from used/free of the third row (-/+ buffers/cache. The difference between the two is that from the perspective of usage, the first line is from the OS perspective, because for OS, buffers/cached is used, so its available memory is 16176KB, the memory used is kb, including the + buffers + cached used by the kernel (OS) + Application (X, oracle, etc.
The third line indicates that, from the application perspective, for applications, buffers/cached is equivalent to available, because buffer/cached is designed to improve file read performance, when the application needs to use the memory, buffer/cached will be quickly recycled.
From the application perspective, the available memory = system free memory + buffers + cached.
For example:
2795064 = 16176 + 110652 + 2668236
Next, we will explain when the memory will be exchanged and by which side. When the available memory is less than the rated value, a meeting will be held for exchange.
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