> I won't try to speak for Michael, but technically that memory does not
> become available for reuse by Perl, even if they are lexical variables
> and they go out of scope, unless you explicitly undef the variables.
> Perl keeps the memory for them allocated as a performance
> optimization.

That was the bit I was forgetting.

As said elsewhere I generally use a MaxRequestsPerChild value of 1000 which
means that any extra memory allocated in your child processes will be
returned to the OS fairly regularly and apache will fork a nice clean child.