So far it has been running off a 512 Megs slice on slicehost with memory usage below 260 megs. I have seen spikes at over 400 megs a while back but I have considerably modified my app since then.

It is running NGinx, two instances of squeak for generating images, Gemstone along with four service gems and a few ruby processes controlled by cron.

It is difficult to give an exact reading for Gemstone since a lot of the memory it uses is in shared memory and would be accounted many times. Right now I am using about 135 megs of shared memory compared to the allowed 2gigs under the new license. Again, it is a very specific application and I have a few number of users.