center os 內存緩存爆滿 清除內存緩存及查看狀態

[root@www chat]# free -m
             total       used       free     shared    buffers     cached
Mem:         15830      15600        229          0        216      14493
-/+ buffers/cache:        890      14939
Swap:         7983          0       7983
[root@www chat]# echo 3 > /proc/sys/vm/drop_caches
[root@www chat]# free -m
             total       used       free     shared    buffers     cached
Mem:         15830        506      15323          0          1         27
-/+ buffers/cache:        477      15352
Swap:         7983          0       7983
[root@www chat]# echo 3 > /proc/sys/vm/drop_caches