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Date: Wed, 16 Feb 2005 16:06:29 -0500
From: Damian Gerow <dgerow@afflictions.org>
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	<20050216201716.GA28436@odin.ac.hmc.edu> <4213B3C8.3090508@centtech.com>
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Subject: Re: where did all my memory go?
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Thus spake Eric Anderson (anderson@centtech.com) [16/02/05 16:02]:
: >On a system that has been up for any significant time, free memory
: >should be very small since free memory is wasted.  My guess is that it
: >is disk cache and that one of the nightly jobs accessed enough stuff to
: >fill it.
: 
: Speaking of this - is there a way to flush the disk cache?  

sync(8)?

But, AFAIK, this doesn't flush the cache held by the HD itself, just that
FreeBSD itself has performed all the writes.