No, it's not the extra weight of the subroutine calls,
although sub calls do cause more overhead. What's causing
this is what I mentioned earlier: you have scoping problems.
None of the code you're benchmarking is actually using a
valid value for either %url or $now. So your results
are completely bogus.
The valid results are those that use a properly scoped
variable. Aighearach's code did this, though I'm not sure
it did so intentionally.
You can accomplish this by declaring your vars as package
globals:
use vars qw/$now %url/;
$now = 8;
%url = ( monday => { @{[map(($_,1), (1..1000))]} } );
This gives valid results.
Benchmark: timing 1000 iterations of Grep, Max, Ternary...
Grep: 6 wallclock secs ( 5.49 usr + 0.00 sys = 5.49 CPU)
Max: 5 wallclock secs ( 5.81 usr + 0.00 sys = 5.81 CPU)
Ternary: 7 wallclock secs ( 6.42 usr + 0.00 sys = 6.42 CPU)
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