释放服务器内存

free -m
total used free shared buffers cached
Mem: 12004 11964 40 0 167 9746
-/+ buffers/cache: 2049 9955
Swap: 14015 0 14015

root@localhost nginx_logs]# sync;sync;sync

[root@localhost nginx_logs]# free -m

total used free shared buffers cached
Mem: 12004 11964 40 0 167 9747
-/+ buffers/cache: 2048 9955
Swap: 14015 0 14015
[root@localhost nginx_logs]# echo 1 > /proc/sys/vm/drop_caches

[root@localhost nginx_logs]# free -m

total used free shared buffers cached
Mem: 12004 1785 10218 0 1 26
-/+ buffers/cache: 1757 10246
Swap: 14015 0 14015

sync;sync;sync;echo 1 > /proc/