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.
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