如果此每15分钟活动用户的成本保持平坦，但总的cpu时间线上升(或下降)，我们就可以断定，这是一个与工作负载或容量相关的问题。
If this cost per active 15-minute user stays flat, but the total CPU line goes up (or down), we can conclude that this is a workload or a capacity related issue.
为了准确地用动态工作负载度量生产服务器的性能，我们需要度量每 15 分钟活动用户的成本。
To accurately measure the performance in a production server with a dynamic workload, we need to measure the cost per active 15-minute user.
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