Analyze and Visualize Git Log for Fun and Profit - DevTernity 2015

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Raimonds Simanovskis

Presentation at DevTernity 2015 http://devternity.com/ Charts by eazyBI https://eazybi.com

Software

Analyze and Visualize
Git Log
For Fun and Proﬁt
Raimonds Simanovskis 
@rsim

Code Metrics...
Lines of
code
Cyclomatic
complexity
Test
coverage
Duplication

Mining Rails —
Learning from your
App’s Lifeline
Michael Feathers,
Corey Haines
RailsConf 2011

Multi-Dimensional
Analysis
TimeFiles
Authors
Measures
Commits
Additions
Deletions
Dimensions
File Extension
Commit
Time Zone
Hour
Week Day

Changes in Ruby ﬁles
Birth of Rails
Great Rails 3
refactoring
RailsConf
is coming

DHH contribution
Rails is mine
Let others
contribute
too
Car racing
takes all
my time…
OMG! I should
give a technical
talk at RailsConf!
Don’t make this
mistake anymore

Top contributors in 2015
by number of commits

9-to-5 disciplined
developer
Hours of day
warms up with
small commits
eats lunch
at 12pm
ﬁnishes work
and socializes
Aaron Patterson

Don’t judge
someone by their
appearance
Hours of day
@tenderlove

Don’t burn
yourself!
Hours of day
José Valim
Why don’t you
sleep?
Ruby on Rails contribution in 2012
Working on
Elixir?
Get angry
and start
deleting
code?

Finding the best
working pattern
Hours of day
Elixir contribution in 2015
José Valim

Contributions by
time zone in 2015
US West
coast
Brasil
Europe
Japan
India

Changes per hour
on Fridays, in 2015
Beer
time
BDD

Linux
> 0.5M commits
> 20M lines of code
> 70M lines of changes
> 14K contributors

Changes over time
Jan 1
1970
Apr 25
2037

Changes over time
Jan 1
1970
Apr 25
2037
Apr 16
2005
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!

What is this large 
C++, C, Assembler
project?

Changes over time
Really?
> 4M LOC?
#### Dependencies
Node.js has several bundled dependencies in the *deps/* and the *tools/*
directories that are not part of the project proper. Any changes to ﬁles
in those directories or its subdirectories should be sent to their respective
projects. Do not send your patch to us, we cannot accept it.

Oh, Unicode…
"Jau0304nis"
"Ju0101nis"
a + ̄
ā

"Jau0304nis"
"Ju0101nis"
.gitconfig
as UTF-8
WHY???

There are only
2 hard things in CS
Naming things
Cache invalidation
Off by one errors
Time zones
Unicode special characters

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Analyze and Visualize Git Log for Fun and Profit - DevTernity 2015

1. Analyze and Visualize Git Log For Fun and Proﬁt Raimonds Simanovskis  @rsim

2. Ignite RailsConf 2012

3. Code Metrics... Lines of code Cyclomatic complexity Test coverage Duplication

4. Git Commit Log

5. Mining Rails — Learning from your App’s Lifeline Michael Feathers, Corey Haines RailsConf 2011

6. Multi-Dimensional Analysis TimeFiles Authors Measures Commits Additions Deletions Dimensions File Extension Commit Time Zone Hour Week Day

7. Ruby on Rails Git Log

8. Changes in Ruby ﬁles Birth of Rails Great Rails 3 refactoring RailsConf is coming

9. DHH contribution Rails is mine Let others contribute too Car racing takes all my time… OMG! I should give a technical talk at RailsConf! Don’t make this mistake anymore

10. Top contributors in 2015 by number of commits

11. Top contributors in 2015

12. 9-to-5 disciplined developer Hours of day warms up with small commits eats lunch at 12pm ﬁnishes work and socializes Aaron Patterson

13. Don’t judge someone by their appearance Hours of day @tenderlove

14. Don’t burn yourself! Hours of day José Valim Why don’t you sleep? Ruby on Rails contribution in 2012 Working on Elixir? Get angry and start deleting code?

15. Finding the best working pattern Hours of day Elixir contribution in 2015 José Valim

16. Contributions by time zone in 2015 US West coast Brasil Europe Japan India

17. Changes per day of week in 2015

18. Changes per hour on Fridays, in 2015 Beer time BDD

19. Linux > 0.5M commits > 20M lines of code > 70M lines of changes > 14K contributors

20. Changes over time Jan 1 1970 Apr 25 2037

21. Changes over time Jan 1 1970 Apr 25 2037 Apr 16 2005 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!

22. Top changed ﬁles

23. What is this large  C++, C, Assembler project?

24. Changes over time Really? > 4M LOC?

25. Changes over time Really? > 4M LOC? #### Dependencies Node.js has several bundled dependencies in the *deps/* and the *tools/* directories that are not part of the project proper. Any changes to ﬁles in those directories or its subdirectories should be sent to their respective projects. Do not send your patch to us, we cannot accept it.

26. Without dependencies

27. Without dependencies

28. Top contributors

29. Ryan Dahl Creator of Node.js

30. Isaac Schlueter

31. Top contributors

32. John Resig Creator of jQuery

33. Top contributors Alexei Vladishev

34. Huge Toad

35. Bonus WTF

36. Why duplicates?

37. Oh, Unicode… "Jau0304nis" "Ju0101nis" a + ̄ ā