메모리 캐시 초기화를 합니다.

[root@ns3 logs]# free -m
total   used   free   shared   buffers   cached
Mem: 5917  5878     39              0          424       2186
-/+ buffers/cache: 3267 2650
Swap: 4094 23 4070


[root@ns3 logs]# echo 3 > /proc/sys/vm/drop_caches



[root@ns3 logs]# free -m
total   used   free   shared   buffers   cached
Mem:   5917  2945   2971          0            7          34
-/+ buffers/cache: 2903 3014
Swap: 4094 23 4070