Date: Wed, 28 Nov 2001 10:32:52 +0200 From: Giorgos Keramidas <charon@labs.gr> To: Anthony Atkielski <anthony@freebie.atkielski.com> Cc: questions@FreeBSD.ORG Subject: Re: Calculating swap file size Message-ID: <20011128083251.GD1844@hades.hell.gr> In-Reply-To: <006101c17728$2fdfae30$0a00000a@atkielski.com> References: <15363.24098.8617.782371@guru.mired.org> <006101c17728$2fdfae30$0a00000a@atkielski.com>
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On 2001-11-27 10:45:01, Anthony Atkielski wrote:
> The FAQ says:
>
> "Note that while FreeBSD is proactive in this regard [swapping pages out in
> anticipation of a need for memory], it does not arbitrarily decide to swap pages
> when the system is truly idle."
>
> As far as I can tell, my lightly loaded system never uses the swap file at all:
>
> freebie# swapinfo
> Device 1K-blocks Used Avail Capacity Type
> /dev/ad0s1b 819072 0 819072 0% Interleaved
>
> So it would appear that the swap file is not touched below some threshold of
> system activity.
Well, not quite so. On my lightly' loaded machine, that runs a few
services that are rarely (if ever) used, swap *is* being used:
$ uptime
10:29AM up 2:52, 1 user, load averages: 0.17, 0.32, 0.50
$ swapinfo
Device 1K-blocks Used Avail Capacity Type
/dev/ad0s1b 1048448 5560 1042888 1% Interleaved
Understanding how the virtual memory subsystem works in FreeBSD is a bit out of
my reach right now, but I think that it will swap out idle processes after a
while. Perhaps I'm wrong...
-giorgos
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