Date: Wed, 16 Jan 2008 17:37:01 +0100 From: Albert Shih <Albert.Shih@obspm.fr> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-questions@freebsd.org Subject: Re: How manu swap ? Message-ID: <20080116163701.GV89314@pcjas.obspm.fr> In-Reply-To: <20080116162805.GH97708@dan.emsphone.com> References: <20080116150454.GP89314@pcjas.obspm.fr> <20080116162805.GH97708@dan.emsphone.com>
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Le 16/01/2008 à 10:28:06-0600, Dan Nelson a écrit > In the last episode (Jan 16), Albert Shih said: > > Hi all > > > > I known it's classic question. > > > > Long time ago when I install a FreeBSD x86 32 bits when I have N Go > > of Ram the installer take 2xN Go for the swap partition. > > > > Now I just install two machine with FreeBSD amd64 version with 8Go of > > Ram and FreeBSD installer take 4 Go of swap. > > > > Is a bug in the installer or now FreeBSD don't need 2xRam of swap ? > > When was the last time you saw your swap partition with more than 2GB > in use? On an 8GB system, you probably will either never have enough > processes to require swapping at all, or you will have one or two > processes so big that if they ever swap, it's a sign you need more RAM, > not more swap :) In systems with that much RAM, swap is pretty much > only used for crashdumps, and with minidumps enabled by default, you OK. I never need this because FreeBSD never crash....well more specific : I never see FreeBSD crash and event it's crash I not qualify to use crashdumps ;-) > don't need much. On small systems, the 2x-swap rule was because once > you allocated enough processes to require that much swap, you were > pretty much thrashing your system anyway. OK. Thanks for your answer. Regards. -- Albert SHIH Observatoire de Paris Meudon SIO batiment 15 Heure local/Local time: Mer 16 jan 2008 17:35:44 CET
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