Your benchmark is including the loop overhead - which is appropriate for "real" code, but dilutes the difference between the two access methods. Altering the appropriate parts of your code to:
my $lookup = '
_____
';
$lookup =~ s/_____/'$a = $contracts{1}[0];' x NUM_ACCESSES/e;
my $refit = '
my $r = $contracts{1};
_____
';
$refit =~ s/_____/'$a = $r->[0];' x NUM_ACCESSES/e;
and using your last test set I get:
Rate lookup refit
lookup 245666/s -- -32%
refit 360597/s 47% --
which is double the difference shown with the loop overhead included, and is comparable with the result from my benchmark.
Ain't benchmarks fun, almost as good as statictics! :-D
DWIM is Perl's answer to Gödel
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