可以使用sync命令 [root@prd-fygl-app-01 ~]# free -m total used free shared buffers cached Mem: 3792 3663 128 184 148 3003 -/+ buffers/cache: 511 3280 Swap: 0 0 0 [root@prd-fygl-app-01 ~]# cat /proc/sys/vm/drop_caches 0 [root@prd-fygl-app-01 ~]# sync [root@prd-fygl-app-01 ~]# echo 3 > /proc/sys/vm/drop_caches [root@prd-fygl-app-01 ~]# cat /proc/sys/vm/drop_caches 3 [root@prd-fygl-app-01 ~]# free -m total used free shared buffers cached Mem: 3792 395 3397 184 2 19 -/+ buffers/cache: 372 3419 Swap: 0 0 0