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My understanding is that neither Git nor Mercurial can do this well out of the box, and FB and Google both have their own extensions to Mercurial to make this possible (because even though Mercurial is often slower than Git, it’s extensible)
e.g. https://facebook.github.io/watchman/ - used as part of Facebook’s Mercurial solution, I think.
You might be interested in scalar [1] developed by Microsoft for handling large repos.
When is GitHub going to finally add support for Microsoft’s VFSforGit?
Have you ever tried it? It's not remotely performant and wouldn't make sense since GH is read heavy. Plus I'm sure they spend a lot of time thinking about this stuff, no?
If you want to get your feet wet, check out go-git[1]. They have a storage layer that you quickly create alternative drivers for.
Git also has a file system monitor interface which can use Watchman. We (GitHub) are working on a native file system monitor implementation in addition - https://github.com/gitgitgadget/git/pull/900.
And then from mercurial extensions to our own server, mononoke, which apparently has been moved under the Eden umbrella: https://github.com/facebookexperimental/eden
If people want a concrete example, here's a 6 GB repo that's 90% Java, 5% C, then some other languages.
https://github.com/oracle/graal
It's not even a mono-repo - this is just part of the project.
Maybe someone's got some tools that let them dig around in the history and find large things or explain why it's so large? I don't think they've been checking ISOs in.
