Benchmarking?

Anyone experienced with benchmarking and stress tools?

Any good tools, s/w or scripts to examine load, stress, and
performance for web applications? Found some after hitting a search in
google.

Anyone who got his hands dirty on some benchmarking tools other than
PEARs benchmarking tool?

I'd apriciate any link or s/w.

Thanks.
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Regards,
M.Saleh.E.G
97150-4779817