[root@slave03 ~]# ls a* -l;free;df
-rw-------. 1 root root 1627 Dec 14 16:28 anaconda-ks.cfg
-rw-------. 1 root root 2365 Dec 15 14:32 authorized_keys
total used free shared buffers cached
Mem: 20472156 14980952 5491204 1164 414076 13635068
-/+ buffers/cache: 931808 19540348
Swap: 24543228 4664 24538564
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
88090904 19843724 63765748 24% /
tmpfs 10236076 72 10236004 1% /dev/shm
/dev/vda1 487652 77609 384443 17% /boot
/dev/mapper/VolGroup-lv_home
403042160 122123152 260439008 32% /home
/dev/sda 10568798112 949904364 9082022836 10% /data
[root@slave03 ~]# ls a*
anaconda-ks.cfg authorized_keys
[root@slave03 ~]# free
total used free shared buffers cached
Mem: 20472156 14981076 5491080 1164 414088 13635096
-/+ buffers/cache: 931892 19540264
Swap: 24543228 4664 24538564
[root@slave03 ~]# free -g
total used free shared buffers cached
Mem: 19 14 5 0 0 13
-/+ buffers/cache: 0 18
Swap: 23 0 23
[root@slave03 ~]# free -m
total used free shared buffers cached
Mem: 19992 14630 5362 1 404 13315
-/+ buffers/cache: 910 19082
Swap: 23967 4 23963
[root@slave03 ~]# free -h
total used free shared buffers cached
Mem: 19G 14G 5.2G 1.1M 404M 13G
-/+ buffers/cache: 909M 18G
-rw-------. 1 root root 1627 Dec 14 16:28 anaconda-ks.cfg
-rw-------. 1 root root 2365 Dec 15 14:32 authorized_keys
total used free shared buffers cached
Mem: 20472156 14980952 5491204 1164 414076 13635068
-/+ buffers/cache: 931808 19540348
Swap: 24543228 4664 24538564
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
88090904 19843724 63765748 24% /
tmpfs 10236076 72 10236004 1% /dev/shm
/dev/vda1 487652 77609 384443 17% /boot
/dev/mapper/VolGroup-lv_home
403042160 122123152 260439008 32% /home
/dev/sda 10568798112 949904364 9082022836 10% /data
[root@slave03 ~]# ls a*
anaconda-ks.cfg authorized_keys
[root@slave03 ~]# free
total used free shared buffers cached
Mem: 20472156 14981076 5491080 1164 414088 13635096
-/+ buffers/cache: 931892 19540264
Swap: 24543228 4664 24538564
[root@slave03 ~]# free -g
total used free shared buffers cached
Mem: 19 14 5 0 0 13
-/+ buffers/cache: 0 18
Swap: 23 0 23
[root@slave03 ~]# free -m
total used free shared buffers cached
Mem: 19992 14630 5362 1 404 13315
-/+ buffers/cache: 910 19082
Swap: 23967 4 23963
[root@slave03 ~]# free -h
total used free shared buffers cached
Mem: 19G 14G 5.2G 1.1M 404M 13G
-/+ buffers/cache: 909M 18G
Swap: 23G 4.6M 23G
*这里应注意系统已用内存为909M 可用19G
- total: 内存总数
- used: 已经使用内存数
- free: 完全空闲内存
- shared: 多个进程共享的内存
- buffers: 用于块设备数据缓冲,记录文件系统metadata(目录,权限,属性等)
- cached: 用于文件内容的缓冲
- Mem: 物理内存
- -/+ buffers/cache: 基于应用角度考虑(计算已使用内存时减去buffers/cache,计算可使用内存时加上buffers/cache)的内存情况,也可理解为真实的内存使用情况.
- Swap: 交换分区