
Two of my (Linux) servers have lots of memory and lots of small processes so anything that does swap out swaps out quick. These don't use a lot of swap (512Mb?) and don't have gig sized processes to write into swap... so they don't really need the 2+ gig of allocated swap.
One other (Linux) server has big processes (1Gig or more) and when they have to swap out, watch the machine fall apart while the process is swapped out - it takes a while to write 1 gig of ram into swap! Since the process is large, swap needs to be large.... Just hope that server needs to have 3 or 4 multi gig processes swapped out....
So, YMMV! Know your machines and what *may* need to swap out and you can live on the edge and figure your minimum swap.... or you could be safe and boring and have x.5 times RAM... After all... who needs that critical app to run after memory gets tight and the kernel kills it cause it was the memory hog?
Torque is cheap.