cpuTime()
i1 : t1 = cpuTime() o1 = 143.842993791 o1 : RR (of precision 53)
i2 : for i from 0 to 1000000 do 223131321321*324234324324;
i3 : t2 = cpuTime() o3 = 144.841582943 o3 : RR (of precision 53)
i4 : t2-t1 o4 = .9985891519999939 o4 : RR (of precision 53)
The object cpuTime is a compiled function.