其实Galaxy几年前就在用了，后来Linux机毕业移交root，Win机运回老家，就一直荒废掉了。
简单的说，都是sync，Linux下是自带，Win下要去微软下那个Sysinternals工具。
（当然，你得有root权限才行。
用途？
你要有米配UPS，那不用也罢。
记得有阵子驱动不好某板卡老无规律死机来着。
Linux下：
http://www.linuxinsight.com/proc_sys_vm_drop_caches.html
drop_caches
Submitted by admin on Wed, 2006-05-31 16:12Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
To free pagecache:
To free dentries and inodes:
To free pagecache, dentries and inodes:
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.
Win下（限NT内核）：
SysinternalsSuite 中的sync.exe。
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