linux中内存被占用内存,linux 系统，内存被莫名占用

内存被占用内存,linux 系统，内存被莫名占用"/>

linux中内存被占用内存,linux 系统，内存被莫名占用

linux 系统，内存被莫名占用

问题：

在服务器上top ，查看发现应用程序并没有占用多少内存，而free -m 时，剩余的很少，cache的占了一大部分

操作：

1.通过命令 more /proc/meminfo

2.执行命令，释放 cache空间

清理说明：

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.

echo 1 > /proc/sys/vm/drop_caches