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Last I tried it, if I had a million goroutines calling stat(), Go would attempt to spawn a million kernel threads. So I rolled my own rate limiter, bleh.

Is that still the case? (Happy if not)

If it is still the case, is there a standard solution or is it up to the app author?

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It's up to the application author in that case, unfortunately. stat() enters the kernel and resolves in one shot, so it requires a whole thread. I haven't read into it very carefully, but on Linux, perhaps the new io_uring business is going to change this state of affairs. For now, however, you need a semaphore of your own.

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