Scalability?

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严格上讲，scalability还没有正式定义， 甚至有人觉得这样的词完全是带有商业味的。但我觉得以下的解释很直观：

(from Steve Haines)

 

 performance measures the speed with which a single request can be executed, while scalability measures the ability of a request to maintain its performance under increasing load. For example, the performance of a request may be reported as generating a valid response within three seconds, but the scalability of the request measures the request’s ability to maintain that three-second response time as the user load increases.