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8 fraxinusit.com

9 fraxinusit.com

11 P u u (k) = P u (k) R u R P R (Q) = {i [1, R ] q u u (C) = Q} R H 0 P R (Q = q u (C)) > ε

15 Data Sources Page 12 Embedded Linux Conference San Jose May 1st, 2014 W. Mauerer Siemens Corporate Technology

19 Amount of changes Code changes for project 'Linux kernel' Averaged (small window) Averaged (large window) Cumulative "blue" blue Time

20 Code changes for project 'Ruby on Rails' Amount of changes e+05 4e+05 2e+05 Averaged (small window) Averaged (large window) Cumulative "blue" blue 0e Time

24 Nico Weber alexey kutumov Re5JQEeQqe8AvxtiuMwx3w time gcc forumer WCoZDWwJFNSE5yrzoHCJg Chris Lattner bit col pars Gregory Szorc Eric Christopher Anna Zaks direct Sven Verdoolaege kavyass ReJQEeQqe8AvxtiuMwx3w Ted Kremenek header analyz main zong y5 9Onoh4P ygk Tobias Grosser error warn Zong help option David Blaikie behavior issu requir Chandler Carruth mean Douglas Gregor name modul David Chisnall flag Nick Lewycky attribut Bill Wendling inform James Molloy fix fail Matthew Abbott Richard Smith test Jean Daniel Dupas result bug touch valu Devang Patel exampl metadata llvm creat list clang object Sebastian Redl John McCall Howard Hinnant Joel Salomon express Nicola Gigante generat chang pass Robert Ankeney Sandeep Patel Dan Gohman Hal Finkel oper current Florian Pflug Eli Friedman Matthieu Monrocq eli implement ast except Garrison Venn messag support plugin virtual r4start Re5JQEeQqe8AvxtiuMwx3w Guy Benyei Cristiano Giuffrida

25 Jason Wenger Felipe Contreras David Aguilar Nathan Bullock Sitaram Chamarty David Brown John Keeping merg fix andreas koenig os6vvqr command Jens Lehmann rebas list parent commit Jonathan Nieder Erik Faye Lund Jeff King user creat ref test Nguyen Thai Pete Ngoc Wyckoff Duy Junio C Hamano Vitor Antunescript Johannes Sixt error clone avarab Jakub Narebski chang Luke Diamand branch git Alex Riesen status Yves Goergen remot miss push repo Carlos ISO 59 1 Q Mart EDn Nieto Shawn Pearce Torsten utf q B C3 B6gershausen Thomas Rast Dieter Plaetinck run name Mathieu CLAVEL

27 subject content 1 10 Messages initiated (log. scale) Responses (log. scale) deg col High deg Low deg clang subject content 1 10 Messages initiated (log. scale) Responses (log. scale) deg col High deg Low deg git

28 subject content 1 10 Messages initiated (log. scale) Responses (log. scale) deg col High deg Low deg clang subject content 1 10 Messages initiated (log. scale) Responses (log. scale) deg col High deg Low deg git

37 cdn.oliveandcocoa.com/

38 [0, c] cdn.oliveandcocoa.com/

40 Christian Hildner Jinsong Liu Jan Kiszka Christoffer Dall Petr Matousek Cornelia Huck Mathias Krause Runzhen Wang Xiao Guangrong Avi Kivity Christian Borntraeger Dong Hao Gleb Natapov Marcelo Tosatti Raghavendra K T Chegu Vinod Guo Chao Michael S. Tsirkin Stefan Fritsch Takuya Yoshikawa Alexander Graf Grant Grundler Eric B Munson

42 f(x 1, x 2,, x u ) f(x 1, x 2,, x u )

44 A B

45 H 0

46 u [0, 1] u u u u (u ) = (u, u u ) {(u ), (u u )}, u = {u 1, u 2,, u u } u u u u u (u ) = u u u u (u )/ u (u, u ) (u, u ) (u, u ) (u, u ) R = {u 1, u 2,, u u } u (u u ) = u (u ) u u u (u ) = {u u (u ) = u } / u u u u (u ) = u u (u ) u u R. {u [1, R ] u u u (u ) = u } u R (u ) =. R u 0 u R (u = u u (u )) > u, u 1 u R ( ) u

48 H 0

$identi昀er Pie chart: fraction of developer participation in given community color Node size: developers importance according to centrality measure Link thickness: strength of relationship between$

49 Community Decomposition and Quality Estimation III Cheat Sheet Boxes: developer communities Background color: strength of community (green=strong, yellow=weak) Box border color: unique community identi昀er Pie chart: fraction of developer participation in given community color Node size: developers importance according to centrality measure Link thickness: strength of relationship between entities Page 30 Link color: red is inter-community relationship, is Embeddedblack Linux Conference San Jose May 1st, 2014 W. Mauerer Siemens Corporate Technology

50 greensandgills.files.wordpress.com

58 siemens.github.io/codeface github.com/siemens/codeface

60 Cores Minuten [log. Skala] Bootstrap git Linux kernel QEMU

61 Bootstrap git Linux kernel QEMU RAM [MiB] Cores

62 Apache httpd Minuten Cores

Socio-Technical Aspects of Long Term Embedded Systems Maintenance

Socio-Technical Aspects of Long Term Embedded Systems Maintenance Talk/Request for Comments Prof. Dr. Wolfgang Mauerer Siemens AG, Corporate Research, Munich & Faculty of Computer Science and Mathematics