Subject: Re: Is O_DIRECT useless on NetBSD?
To: None <tech-kern@NetBSD.org>
From: Pavel Cahyna <pavel@NetBSD.org>
Date: 11/22/2007 21:01:15
On Wed, Nov 21, 2007 at 05:17:48PM +0200, Antti Kantee wrote:
> On Wed Nov 21 2007 at 16:08:59 +0100, Roland Illig wrote:
> > So am I right that currently there is no way for a program to say "I
> > will write some data to that file, and nobody is going to use it in the
> > next time, so please don't buffer it"?
> > I'm asking because it is pretty annoying that the cached data for
> > programs I often run (like firefox, eclipse) is displaced by data that
> > will not be used. That makes starting these programs very slow.
> I'm not sure. You could try mmap + madvise, e.g. madvise MADV_FREE
> after processing if you're *sure* you won't never ever access the data in
> another program.