What is the use of the free command of linux
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Free command:
Concept: displays the current system memory and swap space usage.
Parameters:
Free is displayed in kb, which is equivalent to free-k
Free-m is displayed in m units
Free-g is displayed in g
Results:
Mem: information about physical memory.
Total total memory
Memory used by used
Free free memory
Shared currently discarded memory, always 0
Memory used by buffers Buffer Cache
Memory used by cached Page Cache
-/ + buffers/cache: information about the memory of the user's process.
The memory used by the used user process is equal to the value of used-buffers-cached in Mem.
The memory that free can provide to the user process is equal to the value of free + buffers + cached in Mem.
Swap: usage of swap space.
Caching mechanism under linux:
In order to shorten the time of calling I Cache O, the Linux operating system uses two types of TCP:
Read-write buffer for Buffer Cache blocks, which is used to optimize the disk's I _ Unio
The read-write buffer of Page Cache inode, which is used to optimize the file system's IBG O
Note: the memory occupied by these two caches can be released at any time in order to free up more physical memory for use by user processes in time.
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