释放缓存区内存的方法
a)清理pagecache(页面缓存)
# echo 1 > /proc/sys/vm/drop_caches 或者 # sysctl -w vm.drop_caches=1
b)清理dentries(目录缓存)和inodes
# echo 2 > /proc/sys/vm/drop_caches 或者 # sysctl -w vm.drop_caches=2
c)清理pagecache、dentries和inodes
# echo 3 > /proc/sys/vm/drop_caches 或者 # sysctl -w vm.drop_caches=3
[root@test4_haili_dev hadoop-2.7.3]# free -m
total used free shared buffers cached
Mem: 7809 7159 650 0 324 2444
-/+ buffers/cache: 4390 3419
Swap: 511 89 422
[root@test4_haili_dev hadoop-2.7.3]# cat /proc/sys/vm/drop_caches
1
[root@test4_haili_dev hadoop-2.7.3]# echo 1 > /proc/sys/vm/drop_caches
[root@test4_haili_dev hadoop-2.7.3]# free -m
total used free shared buffers cached
Mem: 7809 4345 3464 0 0 36
-/+ buffers/cache: 4308 3500
Swap: 511 89 422
[root@test4_haili_dev hadoop-2.7.3]# cat /proc/sys/vm/drop_caches
1
[root@test4_haili_dev hadoop-2.7.3]# echo 2 > /proc/sys/vm/drop_caches
[root@test4_haili_dev hadoop-2.7.3]# cat /proc/sys/vm/drop_caches
2
[root@test4_haili_dev hadoop-2.7.3]# free -m
total used free shared buffers cached
Mem: 7809 4303 3506 0 2 36
-/+ buffers/cache: 4265 3544
Swap: 511 89 422
[root@test4_haili_dev hadoop-2.7.3]# cat /proc/sys/vm/drop_caches
2
[root@test4_haili_dev hadoop-2.7.3]# echo 3 > /proc/sys/vm/drop_caches
[root@test4_haili_dev hadoop-2.7.3]# free -m
total used free shared buffers cached
Mem: 7809 4301 3508 0 0 36
-/+ buffers/cache: 4264 3544
Swap: 511 89 422
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】博客园社区专享云产品让利特惠,阿里云新客6.5折上折
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步