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What’s the advantage of lightweight threading features? I thought your position (based on comments elsewhere) was that kernel threads are roughly as fast as it gets? What am I misunderstanding?

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I think M:N threads mostly aren't worth the drawbacks right now, but those proposed kernel features would change the calculus significantly.

Threads are fast, when they are working for you. If not, you need to wait until the work gets scheduled... and thread context switching is slow.

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