It's not as much as you think, and goroutines also have significant overheads that OS threads don't. Most of the time, when people talk about goroutine overhead

It's not as much as you think, and goroutines also have significant overheads that OS threads don't. Most of the time, when people talk about goroutine overhead, they're referring to the small stacks, which are actually a property of GC--there are language implementations that are 1:1 that also have small stacks, such as SML/NJ.