Perl CPU hog

Small script I used to see if CPU performance is always the same:

root@server:~/pressy# cat cpuhog.pl
#! /usr/bin/perl

use strict;
use warnings;
use Time::HiRes qw/gettimeofday/;
use POSIX qw( strftime );

while (1) {
        my $x = 10000000;
        my $now = strftime("%d.%m.%Y %H:%M:%S", localtime());
        my $starttime=gettimeofday();
        while ($x > 0 ) {
                my $res = ( 3.3333 / 3.14 );
                $x = $x-1;
        }
        my $execution_time = sprintf "%.2f", (gettimeofday() - $starttime);
        print "$now - $execution_time\n";
        sleep (5);
}
root@server:~/pressy#