Threads and Cores

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Perturbatio
 #1
I ran it three times on my system, it was slower each time for the threaded version:

pi = 3.1415926535921401
count = 1000000000
time = 10578
threaded....
pi = 3.1415926535898211
count = 1000000000
time = 11047


pi = 3.1415926535921401
count = 1000000000
time = 10578
threaded....
pi = 3.1415926535898211
count = 1000000000
time = 11062

pi = 3.1415926535921401
count = 1000000000
time = 10578
threaded....
pi = 3.1415926535898211
count = 1000000000
time = 11125


Also, is there a reason pi is different between each version?