Leaks

[Dirk Koopman]

How does one detect memory leaks in perl? 

Specifically: I am getting reports that there is some kind of memory
leak in a piece of network related pure perl code that I have written.
Now, since this is a very old piece of code written when I was less
clueful, it would not altogether surprise me. 

It will some hash with a circular reference that I am not breaking or
something like that. Any suggestions as to how to go about finding it?