Linux下清理内存和Cache方法

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/10 * sync;echo 3 > /proc/sys/vm/drop_caches;

每十分钟执行一次，先将脏数据写回硬盘，之后释放缓存页和入口信息和节点信息等；

Linux下清理内存和Cache方法 /proc/sys/vm/drop_caches

Linux下清理内存和Cache方法 /proc/sys/vm/drop_caches

频繁的文件访问会导致系统的Cache使用量大增

$ free -m
total used free shared buffers cached
Mem: 3955 3926 28 0 55 3459
-/+ buffers/cache: 411 3544
Swap: 5726 0 5726

free内存减少到几十兆，系统运行缓慢

运行sync将dirty的内容写回硬盘
$sync

通过修改proc系统的drop_caches清理free的cache
$echo 3 > /proc/sys/vm/drop_caches

drop_caches的详细文档如下：
Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
To free pagecache:

• echo 1 > /proc/sys/vm/drop_caches
  To free dentries and inodes:
• echo 2 > /proc/sys/vm/drop_caches
  To free pagecache, dentries and inodes:
• echo 3 > /proc/sys/vm/drop_caches
  As this is a non-destructive operation, and dirty objects are notfreeable, the user should run "sync" first in order to make sure allcached objects are freed.
  This tunable was added in 2.6.16.

修改/etc/sysctl.conf 添加如下选项后就不会内存持续增加
vm.dirty_ratio = 1
vm.dirty_background_ratio=1
vm.dirty_writeback_centisecs=2
vm.dirty_expire_centisecs=3
vm.drop_caches=3
vm.swappiness =100
vm.vfs_cache_pressure=163
vm.overcommit_memory=2
vm.lowmem_reserve_ratio=32 32 8
kern.maxvnodes=3

上面的设置比较粗暴，使cache的作用基本无法发挥。需要根据机器的状况进行适当的调节寻找最佳的折衷。

Linux下清理内存和Cache方法

标签：入口   back   详细   tun   sync   dde   shared   计划任务   文件   

原文地址：https://blog.51cto.com/13293070/2523670