I have configured my Ubuntu VirtualBox install to have a base memory setting of 512MB. When running this install, its fairly sluggish in a way that feels like its thrashing memory. In other words, it will be fine for a little while and then suddenly run like a pig for a minute or two. This happens when running a couple of terminals, Eclipse w/ a PyDev Django project, and Firefox, or really any combination of a few applications.
When I look in Windows task manager, the VirtualBox.exe that corresponds to this Ubuntu machine is hovering at about 100MB-120MB.
When I look at System Monitor within Ubuntu, I see that it says for Memory "329.3 Mib (66.3%) of 496.6 MiB" and for Swap "138.6 MiB (38.0%) of 365.0 MiB".
So my first question is, which of these numbers do I believe? (And why the difference?)
My second question is, how can I convince Ubuntu to use the memory I've given it, assuming it will improve performance.