And, with ikegami's test code, run on Ubuntu with perl, v5.8.7 built for i486-linux-gnu-thread-multi (with 1 registered patch...), there's significant variation with variance of x:

our $line = ('a' x 5500) . ' ' . ('a' x 120);

ww@GIG:~/pl_test$ perl 674979.pl</p>

                Rate class_nodot       class     literal
class_nodot    242/s          --        -30%       -100%
class          344/s         42%          --       -100%
literal     106283/s      43872%      30824%          --

[download]

whereas, with ikegami's original, our $line = ('a' x 500) . ' ' . ('a' x 20);

ww@GIG:~/pl_test$ perl 674979.pl
                Rate class_nodot       class     literal
class_nodot   2647/s          --        -30%       -100%
class         3793/s         43%          --        -99%
literal     672122/s      25292%      17620%          --

[download]

In reply to Re: The cost of unchecked best practices by ww
in thread The cost of unchecked best practices by moritz

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