Anonymonk's answer seems to point out a good candidate for your memory problem. My suggestions were rather means to make your code easier to read and understand, which would make debugging easier. I'm sure that creating so many independant perl processes doesn't help though. Adding use strict; and use warnings; can help you solve your memory issues though, as it points out potential mistakes and known pitfalls.
And you're right about $fork, I did not see that it is indeed set. But this demonstrates that your code is hard to read. By the way, the & isn't necessary to call a function, instead, if you want to make a call more explicit, you can use parentheses, like this: Config();.
