We've just set up our VPS server. Our configuration is Java/Tomcat/Mysql, with 384M (min)/1536M(max). We ran into memory problems with Java running in server mode and had to specify memory limit to get Tomcat to work. We fixed it by running Java in client mode. We are still getting memory errors from time to time running Ant task to build our app. In general, we are concerned about how much memory we need as we increase concurrent users. Is anybody else running into similar issues? Knownhost - any recommendations on physical memory to run our stack? Can someone confirm that all processes running on our VPS draw from our memory pool?