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.
^ See, e.g., Twerski & Farber, supra note 191, at 218.
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為什麼曾經斥責子女玩手機的父母,如今自己卻比年輕人沉迷得更深?答案是生理退化、算法算計與社會支持缺位三重因素共謀的結果。
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