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Go’s answer is spinning threads. When an M runs out of work, it doesn’t park right away. Instead, it enters a spinning state — actively checking queues and trying to steal — for a brief period before giving up and going to sleep. The runtime limits the number of spinners to at most half the number of busy Ps — so on an 8-core machine with 6 busy Ps, up to 3 threads can spin at once. Enough to be responsive, not so many that they waste CPU.
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The Day NY Publishing Lost Its SoulHow did we get here? And how do we get back?。谷歌对此有专业解读
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