Simulation of high Portal application load

Hi all,
does anybody has tested Portal environment using some external
application simulating high usage of the server.
I need to test my production environment before I will expose it
for normal usage in my company.
I will appreciate for anybody experiences in this area.
Marcin

I used YourKit on a project about a year ago. I've used a few other profilers and this one was the simplest to install, configure, and use in my opinion. I was doing basic CPU profiling of a WebLogic Portal application on my machine using YourKit within about a few hours of learning of the existence of YourKit. I used it to find performance bottlenecks and it did the job.
http://www.yourkit.com/home/index.jsp

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