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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Swap along with real memory is “virtual
memory”. Many programs preallocate virtual memory at start up
so even if you’re not doing paging (nothing really swaps any more) it is
often a good idea to have swap to allow more programs to do this preallocation.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>There’s a good write up here:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a
href="http://www.linux.com/news/software/applications/8208-all-about-linux-swap-space">http://www.linux.com/news/software/applications/8208-all-about-linux-swap-space</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> ale-bounces@ale.org
[mailto:ale-bounces@ale.org] <b><span style='font-weight:bold'>On Behalf Of </span></b>Michael
Trausch<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, January 18, 2011
10:04 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Atlanta Linux Enthusiasts<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [ale] how do I
increase Linux swap file size?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Even
using my desktop system for heavy tasks, I rarely dip into swap usage. I have 6
GB RAM, and unless I am being pretty wasteful everything fits in that.
Even multilayer GIMP images while compiling the kernel and GCC seems to not
fill up memory (but I can say bye bye to I/O bandwidth...)<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>--<br>
Sent from my HTC Vision (G2), running Gingerbread.<br>
That is, a phone-like mobile device. :)<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Jan 18, 2011 9:56 AM, "Jim Kinney" <<a
href="mailto:jim.kinney@gmail.com">jim.kinney@gmail.com</a>> wrote:<br
type=attribution>
> Swap space _really_ depends on how the system is used. A single user
desktop<br>
> running web browsing and email can have swap turned of if the system has
4GB<br>
> RAM. Using a heavy memory application like extensive gimp on HUGE files
with<br>
> loads of undo levels, leave the swap at 2:1 swap:RAM<br>
> <br>
> For a multi-user server, swap use will be determined by the type of<br>
> application and the loading of it. A multi-purpose system running mail,
web,<br>
> file servics, etc, will benefit from the swap space at around 2:1. But a<br>
> high performance solo-service web server running tomcat with multiple<br>
> multi-core cpu's will not benefit unless the web application has
long-lived<br>
> caching of user state.<br>
> <br>
> High performance file servers (NFS or CIFS) should have swap nearly turned<br>
> off or at the most 1:1 for caching of system . If a fileserver starts<br>
> hitting swap, the pager is about to start beeping.<br>
> <br>
> -- <br>
> -- <br>
> James P. Kinney III<br>
> I would rather stumble along in freedom than walk effortlessly in chains.<o:p></o:p></span></font></p>
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<FONT FACE="Arial" SIZE="2">Proud partner. Susan G. Komen for the Cure.</FONT>
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