Google has the single largest code repository. But Microsoft has the largest product - 500 million lines of code all in a single Git repository.
Here’s an awesome infographic about the size of some significant codebases throughout history:
Google has literally 2 billion lines of code - and it’s all checked into the same repository!(https://goo.gl/ivZ15p)
But it’s multiple products - Google search, Google Maps, and lots of other Google products - all rolled into one giant ball of code.
In terms of the largest single product, that’s probably Microsoft Windows.
Today, Microsoft announced what they believe is the world’s largest Git repository:
- approximately 3.5M files that
- results in a Git repo of about 300 gigabytes in size
- with 4,000 engineers producing 1,760 daily “lab builds” across 440 branches, plus thousands of pull request validation builds.
You can read more about how the Windows team manages this complexity with Git here -https://goo.gl/tj26Es .
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Reference : Quora :-D