Why the amount of open source commits has decreased dramatically in 2009-2010 (according to ohloh.net)? [closed]

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Declining commit graph at ohloh.net:

http://www.ohloh.net/languages/compare?commit=Update&am开发者_如何学运维p;l0=c&l10=lisp&l11=csharp&l12=-1&l1=html&l2=java&l3=php&l4=perl&l5=python&l6=haskell&l7=clojure&l8=scala&l9=ruby&measure=commits

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Maybe the recession has caused people to focus more on work that pays, instead of their hobbies.

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Ohloh stopped automatically discovering new open source projects from code.google.com, sourceforge.net and other forges in January of 2010.

Also a large number of open source projects have since moved to github.com and many new ones start there. Ohloh has never automatically discovered new projects on github.com

So the substantial decline of the graph is due to a data problem on Ohloh's side.

This year, Ohloh has plans to start scraping automatically again. They plan on covering code.google.com, sourceforge.net, github.com and other forges

Since Ohloh's data is based on commit history from source control, the graphs will retroactively correct themselves and all will be right again in the world.