Figure 3: The dependency graph for the part of Buck from Figure 1, except this time generating stub JARs directly from source (the #source-abi nodes) without considering dependencies. Compare this to the graph in Figure 1. This graph is half the height, with more parallelism. (It is also able to avoid compiling some nodes entirely, but that's an accident of the design of this particular module and not something that can be expected all the time.) The effect is even more striking in less trivial graphs.