In lieu of that, a flame graph is tolerable. The polar coordinate one is very pretty garbage. EDIT: Use it when you want to mislead people with a flashy graph.
This simple math fact is the reason why all grand hyperlink projects from 1960 to 2010 couldn't work, e.g. Xanadu.
Worse, in small examples with fewer than a hundred nodes it looks like it is a real improvement over linear text with jumps - we are after all now using _all_ the possible screen real estate.
Edit: I'll keep this up to share my embarrassment, but I missed entirely that the article was about disk space. I admit I only looked at the pictures haha.
Look at the example in the link and try to make sense of it.