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Mercurial was used at Facebook afaik, and I would guess they ended up exceeding 1 million.

When I left, the diff number was in the 15 million range. Not all diffs are landed, but I would assume >60% are, so FB's repo is almost certainly above 10M commits

Sheeeit. At some point, just easier to archive the thing and start with a fresh import.

But you want to have history.

And Google uses a hacked up Perforce.

Nothing hacked about it. They rewrote it completely, keeping just the interface for compatibility. Perforce scales very well but still has a single server at its core - at some point no matter how much money google threw at that machine (it used to be the beefiest single server they had), it just couldn't keep up.

Yes. Sorry, I was a bit sloppy in my expression.

It started out as vanilla, then hacked up, and then the re-write.

I think Facebook's mercurial was/is also a special edition? Or is everything they do upstreamed?

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