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From: Billy <billy@gonoph.net>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] More memory?
Date: Mon, 06 Dec 2004 12:32:13 -0500	[thread overview]
Message-ID: <41B4979D.2030609@gonoph.net> (raw)
In-Reply-To: <49bf44f104120608167e0a24a5@mail.gmail.com>

Grant wrote:
> If I'm reading that right, I'm only *using* using 340MB.  Why doesn't
> the system get rid of some of the inactive stuff in memory so I don't
> have to use more and more swap and slow down my system?

that's what swap does. It moves inactive stuff onto disk so :

* apps have more ram - thus faster
* the OS can cache more data - thus faster

I'll post some of my systems, so you can see their swap usage. The 
machines with the most IO utilize the most swap. The one that serves 
purely dynamic pages uses very little swap - and it's apache server has 
fewer dynamic modules compiled in so that will help on memory foot print 
usage. However, swap usage isn't a bad thing. In fact, it most cases 
it's a really, really good thing.

[Terminal Server] gentoo running 2.6.x kernel. I'm doing an emerge, and 
I have 10 physically different people logged on the system doing work. 
Running on dual 1.6 Ghz opertons. High load average is mostly disk IO 
due to emerge.

  11:56:03 up 18 days, 12:04, 25 users,  load average: 7.65, 7.23, 5.63
           total       used       free     shared    buffers     cached
Mem:       2009       1591        417          0         57        341
-/+ buffers/cache:    1192        816
Swap:      4094       1218       2876

However, since I'm using the ck-sources, and most of the apps are 
interactive, no one even notices I'm doing anything funny.

[Web Server] suse running 2.4.x kernel, a peak of about 15 hits per 
second, and peak traffic of 670kbps. does not act slow. Running on 1.2 
Ghz P3. Also email virus scanner, SMTP and POP - I don't have peak usage 
on those services.

  11:52am  up 274 days, 18:38,  1 user,  load average: 0.00, 0.02, 0.02
           total       used       free     shared    buffers     cached
Mem:       1005        929         75          0        183        319
-/+ buffers/cache:     426        578
Swap:      1027        698        328

[secure commerce server] redhat running 2.4.x kernel, a peak of about 12 
hits per minute, and about 130 kbps. Also not slow, all pages dynamic. 
Running on 1.2 Ghz P3. Database on another system.

  12:17pm  up 67 days,  3:08,  2 users,  load average: 0.01, 0.06, 0.06
           total       used       free     shared    buffers     cached
Mem:        439        414         24          0        159        117
-/+ buffers/cache:     137        301
Swap:       509         37        472


--
gentoo-user@gentoo.org mailing list


  parent reply	other threads:[~2004-12-06 18:39 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <49bf44f104120306566d7e95cc@mail.gmail.com>
     [not found] ` <1102117306.10326.3.camel@sf.rout.dyndns.org>
     [not found]   ` <49bf44f10412031709175d496@mail.gmail.com>
     [not found]     ` <20041204013213.GA30529@vicerveza.homeunix.net>
     [not found]       ` <49bf44f104120318296c48f892@mail.gmail.com>
2004-12-04 23:49         ` [gentoo-user] More memory? James Colannino
     [not found]         ` <200412040853.22010.uwix@iway.na>
     [not found]           ` <49bf44f104120410162d888ca2@mail.gmail.com>
     [not found]             ` <41B2059F.2010407@pnpitalia.it>
     [not found]               ` <49bf44f10412041057329eda1d@mail.gmail.com>
2004-12-05  1:33                 ` Bastian Balthazar Bux
2004-12-06 16:16           ` Grant
2004-12-06 17:20             ` Jerry McBride
2004-12-06 17:32             ` Billy [this message]
2004-12-06 20:36             ` Uwe Thiem
     [not found]     ` <cor8c2$pgv$1@sea.gmane.org>
2004-12-05  0:27       ` [gentoo-user] " Simon Windsor
2004-12-05  1:39         ` Grant
2004-12-05 12:21           ` Tim Igoe
2004-12-05 18:05             ` Grant

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