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Google posted a paper detailing their reasons for choosing monorepo: https://research.google/pubs/pub45424/

Caveat: your company probably isn't Google, so your challenges may be different.

Thanks for sharing that. It's mind-blowing that Google runs everything from a single repo. Most places that I work with create several repos for just one project.

Yeah, it was a significant infrastructure cost. I heard at one time that the single largest computer at Google was the Perforce server. They ended up completely re-writing it (called "Piper") for scaling. This is sort of what I was alluding to with my comment about Google having different concerns than many other companies. They can afford to dedicate a number of engineers to maintaining a monorepo system and then re-writing when it doesn't scale. That said, I personally believe that there are a lot of benefits to monorepos, and I think those tradeoffs are worth it for other companies too.

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