[_ak]

It is exactly Go's model. Go, since the very beginning, has a N:M threading model. runtime.GOMAXPROCS() resp. $GOMAXPROCS is your friend to control the amount of OS threads, and since 1.5 or so, it is by default equivalent to the number of CPUs visible to the Go runtime, anyway.

[Vendan]

Well, he was describing a N:1, not N:M: "No need for actual mutexes as the program is still actually single threaded", but yes, Go has been N:M from the start.