#!/usr/bin/env perl
#===============================================================================
#
#         FILE: fifo-mem.pl
#
#        USAGE: ./fifo-mem.pl  
#
#  DESCRIPTION: Test memory consumption of a push/shift FIFO
#               See https://www.perlmonks.org/?node_id=11157497
#
#===============================================================================

use strict;
use warnings;
use Memory::Usage;

my @fifo;

my $max = 100_000_000;

my $mu = Memory::Usage->new;

$mu->record ('start');

for my $count (1 .. $max) {
    push @fifo, 'dog';
    shift @fifo;
    $mu->record ("After $count iterations") unless $count % 10_000_000;
}

$mu->record ('finish');
$mu->dump;