Jul 01 2009

linux清理内存命令

Category: 技术 — ssmax @ 00:03:19

linux的内存管理机制和windows不同，Inactive是可以直接重用的，就算你执行下面的命令，也只是让你看得爽一点而已，呵呵

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。