They don't. The best way to visualize that, that I've seen is the DHAT tool of Valgrind, that basically builds a trie from the roots based on how much allocatio

They don't. The best way to visualize that, that I've seen is the DHAT tool of Valgrind, that basically builds a trie from the roots based on how much allocations happens in them (the tool measures allocations, but the visualization could just as well be used for time spent).