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> The most commonly cited drawback of OS-level threads is that they use a lot of RAM. This is not true on Linux.

I was under the impression this was context switching rather than memory usage, which I haven't seen much about when these models are compared.

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Goroutines had excellent context switching back when Go preferred to run in a single thread. Version 1.3 or so?

Now that Go defaults to multiple threads it has lost all of that advantage. Goroutine switching and channel send/receive has to apply all of the locking that any multithreaded program has to use.

You have to use locking only with inferior frameworks, who never heard of lockless threading or non-blocking IO. Locking also makes concurrency not only slow but also unsafe.

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