Stress Test Tool?

What are some of the better web server's stress test tools that you can recommend?

We are optimizing number of sites, servers, new development... and need something good...

I would very much like to hear your thoughts...

Any tips, tricks, links, suggestions are much appreciated ;)

Thank you all...
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Hi there,

You might consider to use Mercury LoadRunner, although understand that it is pretty expensive.

Mercury Interactive offers complete testing suite: Stress/Load/Volume Test, Regression Test, Defect Management, etc.
There are another software you might want to see: Empirix /e-Load (


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Mercury is expensive because it covers many protocols, and provides great analysis that others don't offer. It also offers IP spoofing that emulates several client IPs.
There's also JMeter and Grinder. My notes on this is at

- Wilson
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