free
You can use free to view the overall memory usage on the server.
Synopsis:
free [<options>]
The parameters are described as follows:
Valid values of options:
-m: specifies to return the memory size in MB. By default, the memory size is returned in KB.-g: specifies to return the memory size in GB. By default, the memory size is returned in KB.
The following sample statement checks the overall memory usage on the server:
$free
total used free shared buff/cache available
Mem: 791791184 80578952 528945156 68244 182267076 702805628
Swap: 0 0 0
The fields are described as follows:
total: indicates the total physical memory. Total physical memory = Total idle physical memory + Total cache memory + Total physical memory in use.used: indicates the total physical memory in use.free: indicates the total idle physical memory.shared: indicates the total shared memory.buff/cache: indicates the total cache memory.available: indicates the total physical memory available. Total physical memory available = Total idle physical memory + Total cache memory.