You might want to look up Devel::Dprof instead.

For line-by-line profiling, I've found Devel::SmallProf very useful. It's used much the same way.

# wait 160 seconds or whatever...

Actually, I found with both Dprof and SmallProf that the wallclock time is significantly longer than the "profiled" time. For Dprof, I recall 5x; for SmallProf, more like 10x.