turning off garbage collection

Hi, I'm fairly sure this has been asked before (and recently too), but I can't seem to find it in the archives. Sorry for the repetition. Is there a way I can turn garbage collection off in GHC? I'm happy to hack the runtime and comment out code if that is the only way. I just don't know which code. I want to see what effect GC is having on programs that run under buddha. I suspect it is costing me a lot in time traversing large amounts of data that the debugger is hanging on to. Cheers, Bernie.