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Ensuring garbage collection of objects in perl. - Adventures in Engineering — LiveJournal
The wanderings of a modern ronin.

Ben Cantrick
  Date: 2007-06-09 01:29
  Subject:   Ensuring garbage collection of objects in perl.
Public
  Mood:employed
  Music:Underworld - Pearl's Girl
  Tags:  perl, programming, reddit

Perl's garbage collector counts references. When the count reaches zero (which means that no one has a reference), Perl reclaims the entity. The approach is simple and effective. However, circular references (when object A has a reference to object B, and object B has a reference to object A) present a problem. Even if nothing else in the program has a reference to either A or B, the reference count can never reach zero. Objects A and B do not get destroyed. If the code creates them again and again (perhaps in a loop), you get a memory leak. The amount of memory allocated by the program increases without a sensible reason and can never decrease. This effect may be acceptable for simple run-and-exit scripts, but it's not acceptable for programs running 24x365, such as in a mod_perl or FastCGI environment or as standalone servers.

http://www.perl.com/pub/a/2007/06/07/better-code-through-destruction.html
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