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

• frob 5y ago
  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
  • papito 5y ago
    Sheeeit. At some point, just easier to archive the thing and start with a fresh import.
    • saagarjha 5y ago
      But you want to have history.
• eru 5y ago
  And Google uses a hacked up Perforce.
  • quantumofalpha 5y ago
    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.
    • eru 5y ago
      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?