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# Thread: the # of concurrent users

1. ## the # of concurrent users

I just got some test results using WebLoad. My boss wants me to show him how many concurrent users the test load is simulating. After being considering it for several days, I figured out a formula. Please give advice on it.

HPS = hits per second, the data from WebLoad report
Tr = average response time, the data from WebLoad report
Ti = the average interval between 2 hits for a individual user

Tr+Ti = the average interval between 2 attemps of hits for a individual user
hps = 1/(Tr+Ti) = the hits per seconds generated by a individual user
#CU = HPS/hps = HPS/(1/(Tr+Ti)) = HPS*(Tr+Ti) = the # of concurrent users

#CU=HPS*(Tr+Ti)

The key is the Ti! If we can get a number for it, we can finally find the #CU.

did I miss anything ?

[This message has been edited by charles_ezdata (edited 02-06-2002).]

2. ## Re: the # of concurrent users

I'm assuming by concurrent users you mean the number of Virtual Clients hitting your application at one time. WebLOAD's virtual clients individually represent real-life users hitting your web site. If you are running a test with 50 virtual clients, this is the same as if 50 users were accessing your website. These 50 users would continue to repeat the steps in your agenda until you tell the test to stop. So at any given point during your test, there would be 50 concurrent users accessing your site. Is there a specific goal you have in mind? If you can elaborate I may be able to provide a more exact reply.

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3. ## Re: the # of concurrent users

How many virtual clients I can use is depends on my license of the WebLoad. I am not gonna running 100,000 virtual clients to simulate 100,000 concurrent users. It spends too much money and too much client side resource.
What I will do is make every virtual client generates as heavy work load as possible (we can do so by eliminating sleeping time), then I will calculate the work load from the result. That's what the formula in my first post is for.

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