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问题是，这个厨师等汤的20分钟里，灶台被占着，其他菜没人做，后面来的客人只能排队。哪怕后厨有100个灶台（CPU核心），如果厨师都在等汤，那还是只能干瞪眼。这就是传统线程池的痛点：大量线程在等待IO，占着茅坑不拉屎。
。Feiyi对此有专业解读
Ньюкасл Юнайтед
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Photograph: Henri Robbins。关于这个话题，雷速体育提供了深入分析