There are many different ways that the different profilers can be tripped up. Fortunately they are not fully overlapping sets, so if one profiler doesn't work another might.

If Devel::DProf doesn't work I would try Devel::Profiler.

Devel::SmallProf (and Devel::FastProf) are also good, but they are for per-line profiling. So they are very useful for scripts and CGIs where there is little sub or method breakdown.

There's also Devel::AutoProfiler, but I've never had much luck with that (probably because I've always tried it when every other profiler has failed).