Devel::TraceUse can analyze a program to see which part used which module. Command-line usage: $ perl -d:TraceUse myprog.pl will display a tree of the modules ultimately used to run your program. (It also runs your program all the way through to the end with a small startup cost.)
WWW: http://search.cpan.org/dist/Devel-TraceUse/
None
None
None