什么是性能测试？
性能测试（在此主要指软件的性能测试）的定义各家各门派的定义很多，个人比较认同Wiki上面的解释：
In software engineering, performance testing is testing that is performed, from one perspective, to determine how fast some aspect of a system performs under a particular workload.
It can also serve to validate and verify other quality attributes of the system, such as scalability, reliability and resource usage. Performance testing is a subset of Performance engineering, an emerging computer science practice which strives to build performance into the design and architecture of a system, prior to the onset of actual coding effort.
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