UPDATE: typo inflates the results here, study does not produce the improvement shown here. But it does do something, not nothing, so I'm pretty sure it's not a no-op.

C:\perl>perl -v

This is perl 5, version 20, subversion 1 (v5.20.1) built for MSWin32-x
+86-multi-thread-64int

[download]
#!/usr/bin/perl
use strict;
use warnings;
use 5.010;
use Benchmark qw(cmpthese);

my @messages = <DATA>;

cmpthese(1000000, {
    'mca_func' => sub {
        my $out = mca_substitute($_) foreach (@messages);
    },
    'toolic_func' => sub {
        my $out = toolic_substitute($_) foreach (@messages);
    },
    'study_func' => sub {
    my $out = study_substitute($_) for each (@messages);
    },
});


sub toolic_substitute {
    my $message = shift;
    $message =~ s/\{\\d(\d+)\}/sprintf "%0${1}d", int(rand(10**$1))/ge
+;
    return $message;
}

sub study_substitute {
    my $message = shift; study $message;
    $message =~ s/\{\\d(\d+)\}/sprintf "%0${1}d", int(rand(10**$1))/ge
+;
    return $message;
}

sub mca_substitute {
    my $message = shift;
    $message =~ s/\{\\d(\d+)\}/myreplace($1)/ge;
    return $message;
}

sub myreplace {
    return '' unless $_[0];

    my $string = '';
    $string .= int(rand 10) for (1..$_[0]);
    return $string;
}


__DATA__
This is a message! {\d3} --- {\d2}
Another {\d3} Message with {\d5}
A {\d1} little {\d6} longer string {\d3}

[download]
C:\perl>perl testpm.pl
                Rate    mca_func toolic_func  study_func
mca_func     34744/s          --        -32%        -78%
toolic_func  50795/s         46%          --        -68%
study_func  157505/s        353%        210%          --

C:\perl>

[download]

Not bad for a no-op.

1 Peter 4:10

In reply to Re^3: Speed Improvement by GotToBTru
in thread Speed Improvement by Nar

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