Probably not the answer you want to hear, but I would recommend upgrading your OS to a
supported Fedora. It sounds like your apachetop program is buggy, and needs to be patched. (You're no longer getting updates for Fedora 9, though.)
If that is not possible for whatever reason, you'll need to download and compile your own:
http://www.webta.org/projects/apachetop/