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poulami
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Quote poulami Replybullet Topic: performance vs. load testing
    Posted: 04Apr2007 at 4:23am
I recently got some comments/questions related to my previous blog entry on performance vs. load vs. stress testing. Many people are still confused as to exactly what the difference is between performance and load testing. I've been thinking more about it and I'd like to propose the following question as a litmus test to distinguish between these two types of testing: are you actively profiling your application code and/or monitoring the server(s) running your application? If the answer is yes, then you're engaged in performance testing. If the answer is no, then what you're doing is load testing.

Another way to look at it is to see whether you're doing more of a white-box type testing as opposed to black-box testing. In the white-box approach, testers, developers, system administrators and DBAs work together in order to instrument the application code and the database queries (via specialized profilers for example), and the hardware/operating system of the server(s) running the application and the database (via monitoring tools such as vmstat, iostat, top or Windows PerfMon). All these activities belong to performance testing.

The black box approach is to run client load tools against the application in order to measure its responsiveness. Such tools range from lightweight, command-line driven tools such as httperf, openload, siege, Apache Flood, to more heavy duty tools such as OpenSTA, The Grinder, JMeter. This type of testing doesn't look at the internal behavior of the application, nor does it monitor the hardware/OS resources on the server(s) hosting the application. If this sounds like the type of testing you're doing, then I call it load testing.



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