Changing the main code to 

package main;

use strict;
use warnings 'all';
use Devel::Cycle;

for( 1...1_000_000 )
{
  print "\r$_/1000000";

  my $top = Top->new();
  my $bottom = $top->{bottom} or die "NO BOTTOM!";
  $top = $bottom->{top} or die "NO TOP!";

  find_cycle( $top );
  find_cycle( $bottom );
}

[download]

the memory usage on my box remains steady at 2476 kB, so your memory leak has to be somewhere else. Your code as posted is fine so far.

In reply to Re^3: Memory leaks and circular references by shmem
in thread Memory leaks and circular references by jdrago_999

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