这个指标起初只是为了帮助团队更好地决定下一次迭代的计划工作量。
It was originally created to help a team decide how much they can plan for the next iteration.
开发迭代产生应用程序的可部署工作版本(应用程序的工作构建)后，业务分析人员可以通过跟踪关键性能指标(Key Performance Indicator, KPI)来监视系统的实时性能。
After a development iteration produces a deployable, working build of the application, business analysts can monitor the live performance of the system by tracking key performance indicators (KPIs).
其一种方法是迭代式的增加缓存大小并在峰值稳定状态负载下运行应用程序，直到 PMI 指标不再报告任何缓存丢弃操作。
The other option is to iteratively increase the cache size and run the application under peak steady state load until the PMI metrics report no more cache discards.
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