Linux查看内存使用量和交换区使用量
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free -m
total used free shared buffers cached
Mem: 3030 1690 1339 8 66 683
-/+ buffers/cache: 941 2089
Swap: 3904 0 3904
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ free --mega
total used free shared buffers cached
Mem: 3030 1691 1339 8 66 683
-/+ buffers/cache: 941 2088
Swap: 3904 0 3904