principle 6 : poor reliability is worse than poor efficiency
When software is not efficient, it is generally possible to isolate the sections of the program that consume most of the execution time and redesign or recode them for increased efficiency(Principle 194).Poor reliability is not only more difficult to detect, it is also more difficult to fix.A system’s poor reliability may not become apparent until years after the system is deployed–and it kills somebody.Once the poor reliability manifests itself, it is often difficult to isolate its cause.
原则6:低可靠性比低效率更糟糕
当软件效率不高时，通常可以将耗费大部分执行时间的程序部分分离出来，重新设计或重新编码以提高效率(原则194)。但是，可靠性差不仅难检测，而且更难修复。尤其，系统的低可靠性可能要到系统部署多年后才会显现出来——而且可能会导致人员死亡。一旦糟糕的可靠性表现出来，通常很难排查它的原因。
