#!/usr/bin/perl -w
use strict;

use Benchmark;

my $file = $0;
open IN, $file or die "$file: $!\n";

sub joinit { my $content = join '', <IN>; }

sub dollarslash { my $content = do { local $/; <IN> } }

timethese(100_000, {join => \&joinit,
                    slash => \&dollarslash} );

##</code><code>##

Benchmark: timing 100000 iterations of join, slash...
      join:  2 wallclock secs ( 1.52 usr +  0.29 sys =  1.81 CPU)
     slash:  4 wallclock secs ( 2.99 usr +  0.35 sys =  3.34 CPU)