[Haskell] need help

Hi,all I'm a new comer in functional programming,I have defined some functions in Haskell and I want to know how much CPU time each function need and compare the efficiency of these functions. The question is how should I test the CPU time of my function? it seems that those functions to call the system clock should be of type IO, but my functions don't have IO actions, how should I deal with this type conflict? Thanks a lot. rui ---------------------------------------- This mail sent through www.mywaterloo.ca