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Tools for load-testing HTTP servers?

I need to load test a saas system to find capacity+bottlenecks.

My preferred method is to record a few 100,000s or millions of real acess log urls and run it as test with increasing hit rate.

I've looked at several services all have their pros and cons. before I dive into them, which stress test service would you recommend specifically for the use case above?

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marked as duplicate by mailq, Scott Pack, MadHatter, MDMarra, Iain Nov 21 '11 at 14:44

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you can use Apache Jmeter. the Best and Free alternatively, if you want to spend money, you can go for Hp LoadRunner.

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Unless the system is trivially simple, then simply hitting URLs from a log file is not likely to exercise the system properly. Most requests will need to encapsulate some sort of state, such as a session ID received from a previous login step. If the system is very complex, many of the web-based services may not be able to handle it. There are a lot of commercial tools that can do this and cost a lot less that LoadRunner (such as our Load Tester product).

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