They beat M:N in terms of preemptive scheduling and signals. If we’re talking about golang, then they have cooperative scheduling for the first issue, and the second doesn’t really matter.
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They beat M:N for thread creation and destruction.
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Could be different now with Spectre mitigations.
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PTI costs about 200ns per syscall, so it appears to be an insignificant difference.https://lwn.net/Articles/752587/ …
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