load testing based on access log recording

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?

Answer

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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