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Open-source software is a complex system; its development depends on theself-coordinated action of a large number of agents. This study follows thesize of the building blocks, called "packages", of the Ubuntu Linux operatingsystem over its entire history. The analysis reveals a multiplicative diffusionprocess, constrained by size-dependent bounds, driving the dynamics of thepackage-size distribution. A formalization of this into a quantitative model isable to match the data without relying on any adjustable parameters, andgenerates definite predictions. Finally, we formulate the hypothesis that asimilar non-stationary mechanism could be shaping the distribution of mammalbody sizes.

Hard and soft bounds in the evolution of Ubuntu packages. A lesson for species body masses?