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Swap was usefull when you only had 128Mb of memory and were running applictaions which were greater in size either individually or when simultaneously loaded. With modern systems having 4Gb+ of memory, it's more difficult to "fill up" the main memory.
You can probably get away without any swap in these cases. Swap was also used for Core dumps but I'm not sure if that's still true.
Find a few JPEG's taken with a 12 Megapixel camera, and edit them
in the gimp ... that ought to get your machine swapping. Or keep
using it for a few days ... w/ an uptime of 3 hours, and not much
loaded there won't be much swapping going on.