CircleCI (https://circleci.com) offers this right now. We automatically partition your test suite and run it across multiple machines.
Except since it's in the cloud, you don't need to own 10 Mac minis to make this happen. And if you decide you want to split it 20 ways, not 10, you can do that in about 2 clicks.
The nice thing about Kochiku is that it is a free open source project whereas CircleCI is a paid hosted solution. If you have hardware available to use as workers on then Kochiku is free to use. There is a real cost to the time required to setup and maintain Kochiku but, at scale, within a larger company, this route can make sense.
I am sure CircleCI takes security very seriously but it also nice (and a requirement for certain companies) that with a self hosted CI server, that your source code does not leave the company.
Except since it's in the cloud, you don't need to own 10 Mac minis to make this happen. And if you decide you want to split it 20 ways, not 10, you can do that in about 2 clicks.
[disclaimer: I work at https://circleci.com, if that wasn't already obvious]