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Meaning of each field of the free command in linux

Source: Internet
Author: User
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The meaning of each field of the free command in linux-Linux general technology-Linux programming and kernel information. The following is a detailed description. I searched and sorted it out as follows:

Free-m
Total used free shared buffers cached
Mem: 3791 3360 430 0 71 2409
-/+ Buffers/cache: 879 2912
Swap: 1004 0 1003

The first line is from the system perspective, total = used + free. Both buffers and cached are buffer and cache allocated by the system.

The second line is the same total = used2 + free2 available for the application. Buffer/cached is used to improve the file reading performance. When the application needs to use the memory, buffer/cached will be quickly recycled.

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