I think they sort of gave up too soon on splitting up their repos. We've been through this before and made BitKeeper support a workflow where you can start wit

I think they sort of gave up too soon on splitting up their repos. We've been through this before and made BitKeeper support a workflow where you can start with a monolithic repo, have ongoing development in it, and have another "could" of split up repos, sort of like submodules except with full on DSCM semantics. Might take a look at section 5 of this: http://mcvoy.com/lm/bkdocs/productline.pdf http://mcvoy.com/lm/bkdocs/productline.pdf which has some Git vs BK performance numbers. We actually made BK pretty pleasant in large repos even over NFS (which has to be slower than NTFS, right?). And BK is open source under the Apache 2 license so there are no licensing issues. I get it, Git won, clearly. But it's a shame that it did, the world gave up a lot for that "win".