AFAIK, my Devel::FastProf is the only Perl profiler that has support for forking scripts, but unfortunately, I have discovered it has a bug that causes it to malfunction on fast processors (basically, the units used to measure time internally are too big).

I am going to try to solve the bug today.

update: I have uploaded a new version of Devel::FastProf to CPAN with the bug corrected.