Additionally, after controlling for codebase size and complexity, there is no correlation between code coverage and bugs found 17Kochhar, P. S. et al.Practitioners' Expectations on Automated Fault LocalizationISSTA, 2017
“至于产品组合的复杂度，我要区分两个层面：精简重叠，但向上扩张。 比如凯宴有燃油版和电动版，造成重复投资——这是要精简的。但在更高价位段，我们看到了增长机会——这是要扩张的。”
，更多细节参见heLLoword翻译
bottom == top, this is the last element and the owner must CAS
are waiting on which fds. The scheduler maintains an io-waiters
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