First of all, make sure you've installed the lastest versions of 'threads' and 'threads::shared' from CPAN. Older versions have been known to leak memory.

You're not clear in your message (and you didn't supply any code) as to what constitutes the 'memory for a client'. If it is stored in a 'field' in your object, then you must delete the field:

Also, if the client uses its own thread, and that thread exits when the client leaves, then you must either detach the thread or join it. Hope that helps.