I suspect that the kernel is one of the only things running on Facebook's server... | Hacker News

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plorkyeran on Jan 8, 2014 | parent | context | favorite | on: Scaling Mercurial at Facebook

I suspect that the kernel is one of the only things running on Facebook's servers that they didn't write from scratch. Alexandrescu has mentioned that a 1% speedup to HHVM saves FB about $100k per year, and at that sort of scale it's pretty easy for reinventing every wheel to make sense.

moron4hire on Jan 8, 2014 [–]

right, so why can't projects like that exiat in their own repository? what keeps HHVM and Facebook tightly coupled?

pydave on Jan 8, 2014 | [–]

Some of them are.

> We already have some of the easily separable projects in separate repositories, like HPHP

http://article.gmane.org/gmane.comp.version-control.git/1897...

Presumably some parts aren't so isolated.

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