View Full Version : [ubuntu] How much memory do I need?

December 10th, 2008, 08:04 AM

I am getting an Ubuntu 8.04 LTS VPS that gives me 128 MB RAM. It will be managed myself through Webmin. My site has no streaming media and I don't expect more than 1000 visits a month. The site is only 15 pages and only half of those run a small PHP script. Two pages access a MySql DB for access verification - nothing too complex. There are 2 files, 20MB each, that people can download, but I'm not concerned about bandwidth.

Is 128 MB RAM enough? Thanks!

December 10th, 2008, 08:13 AM
Personally I would want 512 mb of ram minimum for halfway decent performance.

128 mb is below the minimum of 256 mb which I wouldn't recommend.

December 10th, 2008, 03:35 PM
Thanks for your reply. I really don't know anything about server memory. I know desktop memory really well though.

1. What's the difference?

2. When you say that you wouldn't recommend 256 MB RAM (or even 128 ) for my site, why? It's a very small site and simple. The most complex thing it does is access a MySql db to verify a username and password. Just asking because I really don't know.

Thanks again!

December 10th, 2008, 05:16 PM
I disagree! </python>

I'm running a 64MB VPS from VPSlink for similar use. A small site with a small DB backend (I use SQLite instead of MySQL -- check it out.) In addition, I use it as a shell account and run irssi for IRC. Instead of apache, I use lighttpd and PHP. All told, i'm using 25MB of ram, 39 free.

If you can get away with not using MySQL, you can do a lot with very little. The biggest memory hogs on my server right now are:

Screen - 6.4MB
irssi - 4.6MB
sshd(x2) - 2.6MB

lighttpd is resident with only 660KB of RAM. Using SQLite is great because it uses the same syntax as MySQL (basically) and saves to a flat file which makes it portable.

Let me know if you need help, fitting a lot into a little is a very rewarding challenge.

December 10th, 2008, 05:43 PM
Mahalo! I hadn't thought of MySql Lite, but I will look into it. Any idea how much memory that uses compared to MySql 5?

December 10th, 2008, 05:58 PM
I don't know myself, but perhaps this thread (http://www.codingforums.com/showthread.php?t=48735) can be of interest?

According to the thread they are stating that it's better to stick with MySQL than MySQL Lite, according to my interpretation of the conversation.

December 10th, 2008, 08:40 PM
They're targeting very different markets. MySQL is great for high load applications and very tricky queries. For pretty basic queries and low volumes, SQLite is a great alternative. The main advantage is that it works without a daemon -- you load up the libraries and go. Firefox uses SQLite for storage, as does Rythymbox and I think Amarok.

When PHP goes to use the sqlite commands, it of course has to load the libraries into memory which takes a couple megs, but it's freed as soon as the script is over, instead of staying resident with many MB of RAM eaten up for nothing.

December 10th, 2008, 11:05 PM
There is an ancient American proverb, circa 1980, which states: "You can never be rich enough, thin enough, or have enough memory in your computer".

December 12th, 2008, 02:58 AM
Along those lines, I suppose one could re-phrase the old question "How much money is enough?" to read "How much memory is enough?" The answer to both is "Just a little more!"

December 12th, 2008, 04:31 PM
128 will be fine for your intended usage. But remember to edit the config of MySQL as it uses 100MB by default. With a quick edit you can bring it down to 30MB.

You may also want to use the 1.3 family of Apache instead of 2.x, its much leaner.

April 17th, 2011, 03:38 PM
It may depend on whether you are using OpenVZ or XEN or another VPS (http://www.rokabear.com/vps.html) tech. With OpenVZ you may be able to get away with a 64, but you should lower MYSQL like the previous post described.

One common mistake in purchasing a vps is that people focus more on RAM than performance. Ram is important as a measure of what you need to fit all of your apps into memory. But if you are on an oversubscribed box, your app may still run slow.

Try a provider that allows you to start at a lower end cheap vps (http://www.rokabear.com/vps.html) and try it out. You can measure your ram and performance and upgrade or downgrade as you need.

Also make sure the provider has a control panel that allows you to monitor your space usage and bandwidth. This is a common source of surprise at the end of the month when a customer gets overage charges.

Rokabear Support

April 17th, 2011, 04:03 PM
Patrick, no one has posted in this thread since 2008, so I'm guessing whatever concerns the OP had have long been resolved.