Ubuntu free and linux memory usage-Linux general technology-Linux programming and kernel information. For more information, see the following. -Bash-3.00 $ free
Total used free shared buffers cached
Mem: 514020 465932 48088 0 15864 348844
-/Buffers/cache: 101224 412796
Swap: 2096440 94916 2001524
Total physical memory: 512 mb used 455 MB shard: the memory shared by multiple processes is 0, and the disk cache size is 340 MB.
The difference between used/free in the second row (mem) and used/free in the third row (-/buffers/cache.
The difference between the two is that from the usage perspective, the second line is from the OS perspective, because for OS, buffers/cached is used, so its available memory is 15864KB, memory in use is 932kb, including buffers cached used by the kernel (OS) using 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.
Therefore, linux memory used memory is normal, different from windows.
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