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I'm not intimately familiar with Go's details here, but you can either just say 'run these green threads kthx' in which that factor is chosen for you, or you can use an explicit pool(s) and do it yourself.

Details: http://doc.rust-lang.org/green/index.html

libgreen will automatically pick a reasonable default number of OS threads to use if you don't, based on the number of CPU cores. (This is different from the way GOMAXPROCS works.) You may spawn any number of tasks and they will be automatically multiplexed onto those threads.

Go's threading model is M:N threading. N is the fixed number of kernel threads, M is the variable number of application threads.