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Contributors Turnover

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  • 1. Contributors turnover Dynamics of the libre software community Israel Herraiz <herraiz@gsyc.es> A Coruña, November 17th 2007 Master on Free Software
  • 2. 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
  • 3. Main contributors 80% of the work is done by 20% of the ● people Master on Free Software
  • 4. Top contributors go away What would happen? ● Are they “code gods”? ● Master on Free Software
  • 5. 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
  • 6. Methodology Results are given as plots and indexes ● Master on Free Software
  • 7. 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
  • 8. Generations index Master on Free Software
  • 9. Kind of projects: code gods Master on Free Software
  • 10. Code gods. Heatmap of the matrix Master on Free Software
  • 11. Code gods. 3D Maps. Relative. Master on Free Software
  • 12. Code gods. 3D Map. Absolute Master on Free Software
  • 13. Kind of projects: generational relay Master on Free Software
  • 14. Generations. Heatmap Master on Free Software
  • 15. Generations. 3D Map. Relative Master on Free Software
  • 16. Generations. 3D Map. Absolute Master on Free Software
  • 17. Kind of projects: mixed behaviour Master on Free Software
  • 18. Mixed behaviour. Heatmap Master on Free Software
  • 19. Mixed behaviour. 3D Map. Relative Master on Free Software
  • 20. Mixed behaviour. 3D Map. Absolute Master on Free Software
  • 21. Summarising Three kind of projects: ● Code gods – Index ~ 100 % ● Generational relay – 0 % < Index < 100 % ● Mixed behaviour – Index ~ 0 % ● Master on Free Software
  • 22. Age vs. Index Master on Free Software
  • 23. Index distribution Master on Free Software
  • 24. 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