Here is a sample program to run as demonstration. It will use around 500 megs of ram, and 99% cpu for about 10 seconds, then the cpu drops to zero. (Adjust for your system's abilities)

#!/usr/bin/perl
use warnings;
use strict;
use Math::BigFloat;

my $x = Math::BigFloat->new(0);
my $y = Math::BigFloat->new(10000000);
my @array = ($x..$y);

for(1..10){
    map { $_++ } @array; 
  }

print "$array[1000000]\n";
print "hit enter to exit\n";

<>;
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