ProfileSVG is a package built on top of FlameGraphs. Among the Julia packages, ProfileView currently has the most comprehensive tutorial on how to interpret a flame graph.
Basic Usage in Jupyter
using ProfileSVG @profview f(args...)
f(args...) is the operation you want to profile.
The following screenshot illustrates Jupyter usage on a demonstration function
You can hover over individual blocks in the flame graph to get more detailed information.