Subject: Re: RAW access to files
To: Wojciech Puchar <>
From: Alfred Perlstein <>
List: tech-kern
Date: 12/12/2001 00:29:44
* Wojciech Puchar <> [011212 00:28] wrote:
> > > for our app only on FreeBSD, Windows, Solaris, and Linux, AFAIK.
> >
> > Direct IO is a good idea, it prevents applications that are basically
> > doing a cache walk from blowing out all your cache.
> exactly
> > Take for instance anything that either keeps its own cache (postgresql)
> > or something that would completely never reuse its cache, like
> > cp/dd.
> like copying image from CD

Yes, anything of that nature.  The idea is to minimize impact on
other program that may have resident data sets.

-Alfred Perlstein []
'Instead of asking why a piece of software is using "1970s technology,"
 start asking why software is ignoring 30 years of accumulated wisdom.'