How to know if a custom ROM uses existing swap partition
Simply get yourself a terminal app (a good choice would be Android Terminal Emulator), start it, and enter the command free. The output then should look like this:

             total       used       free     shared    buffers
Mem:        487344     474312      13032          0      42224
-/+ buffers:           432088      55256
Swap:             0          0         0


This example is from my Motorola Milestone 2, and you can see: it does not use any swap: "total" available swap space is "0". If your device would use swap, at least the numbers for "totals" and one of "used" or "free" should be &gt; 0.