Google > “linux drop_caches” first result:
http://www.linuxinsight.com/proc_sys_vm_drop_caches.html

To be sure a test is going to disk and not file system cache for everything in 
linux, run:
‘sync; cat 3 > /proc/sys/vm/drop_caches’

On 3/11/09 11:04 AM, "Andrej" <andrej.gro...@gmail.com> wrote:

2009/3/12 Scott Carey <sc...@richrelevance.com>:
> [...snip...].    All tests start with 'cat 3 > /proc/sys/vm/drop_caches', and 
> work on
>  a 32GB data set (40% of the disk).
What's the content of '3' above?

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