对于某些情况——比如在您自己的工作站本地运行的Web服务器、数据库和浏览器——挂钟时间能够提供信息。
For some circumstances — say, running the Web server, database, and browser locally on your own workstation — wall clock time can be informative.
一个简单的性能指标是挂钟时间(wall clock time),或测量页面请求与完成呈现之间的实际延迟。
A simple performance metric is wall clock time, or measuring the real-world delay between a request for a page and a finished rendering.
然而,挂钟时间对于其他大多数情况而言并无实际意义,比如网络延迟时间、活动的Web服务器或者活动的数据库。
However, wall clock time is merely anecdotal for most other permutations, such as those that include network latency; a trafficked, live Web server; or an active database.
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