[galaxy-user] storage space/processor speed

I am trying to perform a "join" on two sets of intervals. There are ~20,000 intervals in one dataset and about 13 million on the other. This has been running for about 3 days now, and I'm pretty certain that its not going to work. Is there a way to know if there is enough memory available for a given function to run ahead of time? Also, how much storage space does each account have available? I know that one can access cloud space online, through amazon for example. However that seems to be fairly complicated and a bit out of reach for me for the short term.