Date: Tue, 29 Oct 1996 11:28:03 -0600 (CST) From: Joe Greco <jgreco@brasil.moneng.mei.com> To: bsdcur@shadows.aeon.net (mika ruohotie) Cc: dyson@FreeBSD.org, dtc@scrooge.ee.swin.oz.au, current@FreeBSD.org Subject: Re: Request to add this to FAQ re: swap space Message-ID: <199610291728.LAA24544@brasil.moneng.mei.com> In-Reply-To: <199610291340.PAA24942@shadows.aeon.net> from "mika ruohotie" at Oct 29, 96 03:40:25 pm
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> somehow, i've learned the formula for swap space to be 3.5 * ram The real formula for swap space is "more than you can possibly imagine needing"... Solaria, my venerable old Sun 3/60 (maxxed out at 24MB RAM): (solaria.root.q4-2) 11:24am ~ 80 # pstat -s 16984k allocated + 1592k reserved = 18576k used, 177656k available (solaria.root.q4-2) 11:24am ~ 81 # Showing that "8x RAM" is not unthinkable :-) > wasnt that the "old" unix way? or something. > > is there _any_ disadvantages from having a _lots_ of swap? since on "small" > machines i tend to use, depending the amount of drives, swap from 24 to > 72 megs... on each drives. on servers i tend to use 128 megs on each drive, > and i always have atleast two drives... assuming i'd have 6 drives i would > have some 700+ megs of swap, and probably "just" 128 megs ram, would i run > into troubles? (with 2gig drive it's "easy" to give out 128 megs for swap) Yes it is, and these days I would do it. > what i mean, is there a number above which i'd get into troubles? (like say > 1024 megs) > > what kinds of swap spaces one needs on a news server? You do not really want to swap on a news server. On my news servers I try to go min 4x RAM but I have a fit if I see any substantial percentage being used (I don't mind if daemons get swapped out). > on a web server? i > rather would not swap at all, but i'm not the one who pays the ram... =) Boy do I ever hear that :-) ... JG
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