SOURCE: DistroWatch.com Questions and Answers (by Jesse Smith) Memory usage One of our readers asked about programs which display memory usage, what to use and what the different types of memory (shared, virtual, swapped, cached) mean. Furthermore, what fields are important to look at when comparing different systems? First let's talk about programs to use when monitoring memory usage. When in doubt, I generally fall back to basics and use "top". It runs everywhere and shows you most of the information you should need, both in regards to memory usage and CPU usage. If you're just concerned with how much memory is being used by the system and uninterested in CPU usage then "free" is also a good command to run as it'll show you usage information for shared memory, cache and swap. When looking at GUI applications, I like KDE's System Monitor. The default layout looks a lot like top's, but it's easy to configure System Monitor with differ...