timethis 2000000: 52 wallclock secs (26.95 usr +  0.39 sys = 27.34 CPU) @ 73152.89/s (n=2000000)
timethis 2000000: 38 wallclock secs (25.47 usr +  0.34 sys = 25.81 CPU) @ 77489.35/s (n=2000000)