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Date: Sun, 18 Nov 2001 23:21:13 +0100
From: =?ISO-8859-15?Q?Fran=E7ois?= Cami <stilgar2k@wanadoo.fr>
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To: "J.A. Magallon" <jamagallon@able.es>
Cc: James A Sutherland <jas88@cam.ac.uk>, war <war@starband.net>,
        linux-kernel@vger.kernel.org
Subject: Re: Swap
In-Reply-To: <3BF82443.5D3E2E11@starband.net> <E165ZRi-000718-00@mauve.csi.cam.ac.uk> <20011118230540.A2042@werewolf.able.es>
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J.A. Magallon wrote:


> Yes, a box without swap runs faster, but if you *don't do anything* with it. The test
> shown in previous mails had a ton of apps opened *doing nothing*. Try do do
> a grep several times on the kernel source tree for example in that scenario.
> Or a kernel build. They will be dog slow (all the tries). Try the same on
> a box with swap, the second time much things are cached and it flies.

I tend to both agree and disagree with you.


fact :
I don't use more than 350MB of my 512MB for apps (and that's a
worst case scenario), and I guess than 150MB of RAM is enough
for caching, at least in my case.

I agree that a box that uses 99% of its RAM for apps
will be dog slow ; but I simply have to disagree with
swapping apps I *use* when 66% of my RAM is free.
Have you tried pulling openoffice from swap to RAM ?
If doing a second [and third, and so on] grep on the kernel source
tree is dog slow without swap, pulling openoffice from swap is
*snail* slow.

Fran?ois

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