Web Application Benchmarking

I have a web application written in PHP using MySQL that I would like开发者_如何学Go to test to see how many users it can handle, how much activity, etc.

What method should I use to do this?

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apache ab might help, as can sql-bench. It is however an art in itself to write a good stress test (urls, postvalues, etc.), and highly dependent on the actual project.