On Thu, 2007-02-08 at 22:33 -0500, hkclark@xxxxxxxxx wrote:
> I'm helping some folks who have a CentOS 3 i386 server with 512MB of
> RAM. The output of 'free' looks like:
>
> $ free
> total used free shared buffers cached
> Mem: 511428 497956 13472 0 29868 178280
> -/+ buffers/cache: 289808 221620
> Swap: 2040244 120644 1919600
>
> The box does not even have X installed... it's basically a web
> application and email server. They would like to upgrade to CentOS 4,
> but are concerned that it could be considerably more "memory hungry"
> and lead to memory starvation (they don't want to add more RAM to the
> box at this time, although that could be an option down the road).
>
> I ran some tests under VMWare with fresh installations of CentOS 3 and
> CentOS 4 (both using a "minimal install", the same as the server in
> question) and CentOS 4 seemed to only use 10-25MB more memory.
> However, it's hard to know how this will translate into real-world
> performance over time and with the application installed.
>
> Does anyone have any experience that would suggest how much more
> memory a non-X server like this might require? If the application(s)
> on the server stay the same, do you think we would run into issues
> where memory would be depleted to a level that would cause concern?
---
I wouldn't think so, this system actually does have some x-stuff
installed.
# cat /etc/redhat-release
CentOS release 4.4 (Final)
# free
total used free shared buffers
cached
Mem: 515604 509760 5844 0 37832
117296
-/+ buffers/cache: 354632 160972
Swap: 1048568 268324 780244
It's running
httpd/php5/mysql-4/postfix/amavisd-new/ejabberd/ntp/cupsd/apcupsd
(slave)
Craig
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