alt Hacker NewsThe most promiment example is probably Go with its goroutines, but there are so many more. You can easily spawn tens of thousands of goroutines, with low overhead and great performance.
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vlovich123 • today at 2:21 PM
I thought it was obvious from context: OS threads are too heavyweight for fine grained concurrency
Go uses userspace threads. It’s also interesting that Go and Java are the only mainstream languages to have gone this route. The reason is that it has a huge penalty when calling FFI of code that doesn’t use green threads whereas this cost isn’t there for async/await.
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Goroutines/"fibers"/"green threads" are usually scheduled by the runtime system across a small pool of actual OS threads.