Fat tails, long memory, maturity and ageing in open-source software projects

Abstract

We report activity data analysis on several open source software projects, focusing on time between modifications and on the number of files modified at once. Both have fat-tailed distributions, long-term memory, and display systematic non-trivial cross-correlations, suggesting that quiet periods are followed by cascading modifications. In addition the maturity of a software project can be measured from the exponent of the distribution of inter-modification time. Finally, the dynamics of a single file displays ageing, the average rate of modifications decaying as a function of time following a power-law.

14 pages, 18 figures. Feel free to ask one of the authors for a pdf file with high-quality figures

References in corpus (13)

• The origin of bursts and heavy tails in human dynamics
• Modeling bursts and heavy tails in human dynamics
• Software systems as complex networks: structure, function, and evolvability of software collaboration graphs
• A continuous time random walk model for financial distributions
• Hierarchical Small Worlds in Software Architecture
• Exact results for the Barabasi model of human dynamics
• A theory for long-memory in supply and demand
• Size matters: some stylized facts of the stock market revisited
• Logarithmic growth dynamics in software networks
• Punctuated Equilibrium in Software Evolution
• Response time of internauts
• Crossover from Endogenous to Exogenous Activity in Open-Source Software Development
• Fifteen Minutes of Fame: The Dynamics of Information Access on the Web