This is call profile graph of my latest invention, AwesomeProxy. This lets us move sites and databases between servers without a single failed HTTP request. Working on some optimisations, I wanted to see how much time was spent in each function call.

Gprof2Dot outputs pretty awesome graphs. This is what you get when you run AwesomeProxy for three minutes at 10 requests per second (each request taking 3 seconds and doing a database update). I really like how you can see the structure of the code