[opencms-dev] Minimum memory requirements?

[Joe Desbonnet]

Out of curiosity I did that experiment. I rebooted a AMD64 PC running
Fedora Core 4 which has 1GB RAM with mem=128M boot parameter. This
simulated a computer with 128MB RAM. I installed Tomcat 5.5.9 and used
Sun Java 1.5.0_03 AMD64 version.

I set the computer to run at Run Level 3 (ie without X Window running
to cut down unnecessary memory use).

Started MySQL and Tomcat. So far so good. Copied opencms.war into the
webapps directory and started setting up OpenCms. It started off ok --
some moderate amounts of page faulting. I went a away for a while (40
min?). When I came back it was trashing (ie too much page faulting)
and there were time out errors in the install log.

So in conclusion, OpenCms + Tomcat + MySQL on Linux with only 128MB
will probably not do. I suspect 256MB will be ok for small sites, but
I don't have time to test that out.

BTW: for those not familiar with the term 'page fault': it's what
happens with the OS runs out of real RAM memory. It starts resorting
to hard disk space to supplement it the RAM, which is great as long as
it doesn't happen too often. See
http://en.wikipedia.org/wiki/Page_fault

Joe.


On 8/24/05, Joe Desbonnet <jdesbonnet at gmail.com> wrote:
> Is your memory fixed or can you easily upgrade if you pick the wrong option?
> 
> Now I havn't tried this, so I don't know if it will work: if you have
> a Linux machine, you can tell it to boot and use less memory that it
> actually has using the mem=xxxxM boot option.
> So you could try mem=128M on your development computer and see how the
> system performs.
> 
> My hunch is that you just might get away with 128MB but it will impact
> performace. I think 256MB would be closer to the mark. I normally
> recommend 512MB or more for any serious application server.
> 
> Joe.
> 
> 
> On 8/24/05, Robert Burén <robert.buren at gmail.com> wrote:
> > Hi all,
> >
> > I want to deploy our new site on a rented virtual linux server,
> > running Debian, Tomcat and MySQL. Since virtual servers are basically
> > priced on the amount of memory you get assigned to you, I really need
> > to know what the minimum memory requirements on this machine would be.
> > I suppose 64 MB is out of the question? Would 128 MB be worth a try?
> > Or do I have to go for the more expensive 256 MB?
> >
> > The site will be a pretty low volume site, with a couple of dozen
> > pages. It's our company's home site, so it's going to be semi-static,
> > but we need to be able to update it easily. We will probably update it
> > on a weekly basis, but not every day. It will include a simple RSS
> > aggregation from our other site (a blog site), so a pure static export
> > doesn't cut it.
> >
> > I don't really need to run anything else on the server, except for
> > sshd for logins. If there are resources to spare, I might run an email
> > (smtp/imap) server on it as well, but I'll definitely skip that if
> > that would mean that I could go for the 64 MB option!
> >
> > Any input based on experience from you guys?
> >
> > Thanks,
> >
> > Robert
> >
> >
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