To understand and diagnose performance issues, you first need to determine your baseline performance level.

要想了解和诊断性能问题，首先需要确定基线性能水平。

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If the workload is large and the system is poorly tuned, it can take a long time to get a baseline performance number.

如果工作负载很大而且系统优化不好，则需要花很长时间才能获得基准性能值。

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Let's first introduce two of the key concepts used in determining baseline performance: network latency and network bandwidth.

首先介绍在判断基线性能时使用的两个重要概念：网络延时和网络带宽。

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Checklists established a higher standard of baseline performance.

NEWYORKER: The Checklist

Data from these initial tests will be used as a baseline to evaluate the performance of emerging CO2 capture technologies.

FORBES: Still Chasing Clean Coal, US Opens Carbon Capture Lab

In other words, a country would decide how its land-use carbon emission or absorption would be likely to change in future, and then to measure actual performance against that baseline.

BBC: Rich countries accused of carbon 'cheating'