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Date: Thu, 22 Nov 2001 12:56:07 -0500
From: war <war@starband.net>
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To: James A Sutherland <jas88@cam.ac.uk>, linux-kernel@vger.kernel.org
Subject: Re: Swap vs No Swap.
In-Reply-To: <3BFC5A9B.915B77DF@starband.net> <E166wSm-00063a-00@mauve.csi.cam.ac.uk> <3BFD2997.95F2B9EE@starband.net> <E166xr9-0000Qy-00@mauve.csi.cam.ac.uk>
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This is incorrect.
SWAP is used on a [1GB ram/2GB swap system].

I talked to Rik about this.
He said generally SWAP is a good thing and increases performance.

However, in my case it does not.

Nov 22 12:18:41 <war> riel: For a single user system.
Nov 22 12:18:43 <ata> war: what are you trying to do ?
Nov 22 12:18:44 <riel>  war: it all depends on what you use the computer for
Nov 22 12:18:56 <riel>  war: that's a very important thing to specify ;)
Nov 22 12:18:57 <war> General X apps, staroffice/netscape/media
stuff(aviplay)/etc
Nov 22 12:19:06 <war> compiling apps once and awhile
Nov 22 12:19:13 <riel>  war: ok, in that case you omost likely don't need swap
Nov 22 12:19:32 <riel>  war: but you really _need_ to tell what you are using
the computer for before anybody can give a sensible answer ;)
Nov 22 12:19:43 <war> riel: thats what I thought too, yet people still say I do
even after I told them what I was using it for
Nov 22 12:19:52 <ata> learath: nope 1gb will still win just one app will loose
and die
Nov 22 12:19:54 <war> riel: I sent the list of my ps auxww (512 processes) and
I still had 350MB left over.
Nov 22 12:20:05 <riel>  war: yup, I saw that



James A Sutherland wrote:

> On Thursday 22 November 2001 4:36 pm, war wrote:
> > The bottom line here is:
> >
> > There is no need for swap if you have enough ram.
> > Using swap with more than enough ram does absolutley nothing for the
> > system, except by degrading the performance of it.
>
> If the system has so much RAM that EVERYTHING fits in RAM - programs, data
> and FS cache - then the swap won't be touched anyway, and makes no
> difference. This is rather unlikely on a PC; in practice, adding swap should
> always improve matters. (Of course, the VM isn't perfect yet...)
>
> James.
> -
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