Linux清理内存

linux的内存管理机制和windows不同，Inactive是可以直接重用的

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 not freeable, the user should run “sync” first in order to make sure all cached objects are freed.

This tunable was added in 2.6.16.


清理完后重新
# echo 0 > /proc/sys/vm/drop_caches
就可以恢复原来的机制了。


查看内存条数命令：

dmidecode |grep -A16 "Memory Device$"