Your iteration count is 10_000_000, but your divisor is 1_000_000

Indeed. Why should they be the same? The interator counts iterations. The divisor divides the number of microseconds. I'd divide by a million regardless how many times I iterated.

This 
my $d2 = $s3 - $s2 + ($m3 - $m2) / 1_000_000;

[download]
is parsed as 
(my $d2 = (($s3 - $s2) + (($m3 - $m2) / 1000000)));

[download]
Indeed it is! Exactly as I intent it! Surprise, surprise.
which means that you are adding 1 millionth of the difference in the milliseconds to the difference in the seconds.
Wrong. RTFM. gettimeofday returns the number of microseconds. And guess what? There are a million microseconds in a second. Even in the USA and the UK.

Now, beside being wrong, you are also inconsistent. In your first point, you accuse me of not dividing by the number of iterations, as if the value wouldn't be a number of sub-second units. Then in your second point you do think it's a number of sub-second units. You can't have it both ways.

In reply to Re^4: &1 is no faster than %2 when checking for oddness. (Careful what you benchmark) by Anonymous Monk
in thread &1 is no faster than %2 when checking for oddness. Oh well. by diotalevi

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