You have a pre-defined variable named total_time for the wall-clock time of the whole data collection.

有一个预定义的变量 total_time，它代表整个数据收集过程的时钟时间。

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Example: Probe to fire every 500 milliseconds (wall clock time).

示例：每500毫秒(墙上时钟时间)触发一次的探针。

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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.

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。

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