From: Daniel Egger <degger@fhm.edu>
To: Mark Hahn <hahn@physics.mcmaster.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mmapping large files hits swap in 2.4?
Date: 11 Aug 2002 00:19:59 +0200 [thread overview]
Message-ID: <1029018000.2539.7.camel@sonja.de.interearth.com> (raw)
In-Reply-To: <Pine.LNX.4.33.0208101437380.838-100000@coffee.psychology.mcmaster.ca>
Am Sam, 2002-08-10 um 20.49 schrieb Mark Hahn:
> > It is just that it seems the mmaped region is not really bakked by
> > the underlying file but by swap space which was exactly what I
> > was trying to avoid by using a file.
> why do you think that?
Because the amount of free swap shrinks continously with mmaped memory
being touched. If I understood the concept of mmap correctly the system
should buffer read/writes to the mapped memory location with real RAM
and page out to the file.
My problem actually is that although I have enough memory to buffer the
whole area the kernel decides to hit hard on the disc which makes the
performance suck.
--
Servus,
Daniel
next parent reply other threads:[~2002-08-10 22:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.33.0208101437380.838-100000@coffee.psychology.mcmaster.ca>
2002-08-10 22:19 ` Daniel Egger [this message]
2002-08-12 9:11 ` mmapping large files hits swap in 2.4? Helge Hafting
2002-08-12 11:41 ` Daniel Egger
2002-08-09 17:26 Daniel Egger
2002-08-10 12:12 ` Richard Zidlicky
2002-08-10 16:17 ` Daniel Egger
2002-08-10 23:13 ` Richard Zidlicky
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