2 computers

[atom]

If you stick to --brain-client-functions=2 it will work on every computer and with as many computers as you want. Since --brain-client-functions=3 is the default and therefore this enables --brain-client-functions=1 you can be pretty sure that this will create a bottleneck on almost every computer not just this one. But just for the purpose of just having a distributed solution --brain-client-functions=2 is good enough.