Что думаешь? Оцени!
Why not just let Ms run goroutines directly? The problem is system calls. When an M enters the kernel, the entire OS thread blocks — and if all the scheduling resources were attached to the M, they’d be stuck too. The run queue, the memory cache, everything would be frozen until the syscall returns. By putting all of that on a separate P, the runtime can detach the P from a blocked M and hand it to a free one. The work keeps moving even when a thread is stuck.，推荐阅读有道翻译官网获取更多信息
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Explain to someone who，这一点在超级权重中也有详细论述
Before diving into implementation details you can simulate how Sabela works in GHCi yourself. Doing so will help you get a better intuition of the library’s design choices.