Python limited to one core on fedora linux

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http://stackoverflow.com – I have octa core processor (amd fx-8120 on 3.4GHz), and I tried to use multiprossing library on fedora 18, It created all process but i didnt work, It only used one core. What I have to change on my python code? Thanks import time def fibo(n): if n < 2: return n else: return (fibo(n-2)+fibo(n-1)) start_time = time.time() print fibo(35) print time.time() - start_time, "seconds" (HowTos)