Contributors Turnover

Contributors turnover Dynamics of the libre software community Israel Herraiz <herraiz@gsyc.es> A Coruña, November 17th 2007 Master on Free Software

Summary How sensible is a project to the turnover ● of its main contributors? What would happen to Linux if Linus ● Torvalds is hit by a bus? What if the most important developers of ● Debian abandon the project and go for Ubuntu? Master on Free Software

Main contributors 80% of the work is done by 20% of the ● people Master on Free Software

Top contributors go away What would happen? ● Are they “code gods”? ● Master on Free Software

Methodology Divide the history in 10 intervals ● Identify the top contributors in each ● period Track the history of those contributors in ● all the history of the project Master on Free Software

Methodology Results are given as plots and indexes ● Master on Free Software

Generations index Absolute Matrix ● Group 1 10 7 6 5 4 Group 2 4 9 5 2 1 Group 3 2 8 14 3 2 Group 4 0 1 1 9 4 Group 5 0 0 0 8 20 Period 1Period 2Period 3Period 4Period 5 Master on Free Software

Generations index Master on Free Software

Kind of projects: code gods Master on Free Software

Code gods. Heatmap of the matrix Master on Free Software

Code gods. 3D Maps. Relative. Master on Free Software

Code gods. 3D Map. Absolute Master on Free Software

Kind of projects: generational relay Master on Free Software

Generations. Heatmap Master on Free Software

Generations. 3D Map. Relative Master on Free Software

Generations. 3D Map. Absolute Master on Free Software

Kind of projects: mixed behaviour Master on Free Software

Mixed behaviour. Heatmap Master on Free Software

Mixed behaviour. 3D Map. Relative Master on Free Software

Mixed behaviour. 3D Map. Absolute Master on Free Software

Summarising Three kind of projects: ● Code gods – Index ~ 100 % ● Generational relay – 0 % < Index < 100 % ● Mixed behaviour – Index ~ 0 % ● Master on Free Software

Age vs. Index Master on Free Software

Index distribution Master on Free Software

Conclusions Detection of events in projects. Reverse ● engineering of the history of the project. Index gives us the kind of project ● Most of the projects show a generational ● relay So most of the projects are not sensible to ● contributor turnovers Master on Free Software

Contributors Turnover

by Andrés Maneiro on Dec 07, 2007

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Contributors Turnover — Presentation Transcript