Flame Graphs [http://www.brendangregg.com/flamegraphs.html] are a visualisation that I learnt about through the excellent Linux systems performance work of Brendan Gregg [http://www.brendangregg.com/], and saw Luca Canali [https://twitter.com/lucacanalidb] talk about recently at UKOUG Tech 14 [http://tech14.ukoug.org/default.asp?