Analysis on 1000 Vusers

Affuu - Posted on Tuesday, March 24, 2009 1:50:06 AM

I want to do an analysis by loading an application with 1000 users and the SUT,controller,agent are on the same system will I be able to do it,if yes I want to know what will be the Run time settings i need to do,I want to go for constant load of 1000 users,please help me by providing more information on this,I need to check out the CPU utilization,RPS,Memory utilization etc.What counters exactly i need to select so that I can come to a conclusion that how many agents i need to add if I increase the load from 1000 to 2000 to 3000....

What will be the best configuration i.e the number of agents,controller,SUT(its only one system) and SQL express(load store)

One more thing when I run the webtest before adding it to load few of the dependant requests are failing but the mail request page is displaying fine do i need to rectify/make it pass completely before adding to load or is it fine as long as the main requests are rendered successfully

please help me as I am new to VSTS 2008 tool
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Hi

For hardware sizing and the number of required agents, please refer to Performance Considerations section in Load Agent and Load Controller Installation and Configuration Guide for more information. In a test rig, you just need 1 controller.



There are many performance counter category available by default. You can use counters in Processor and Memory category to check the CPU and memory usage. If you are testing an ASP.NET application, Performance Counters for ASP.NET might also be helpful.



It's correct to fix web tests before adding them in load tests. About the failing of dependent requests, please take a look at Masking a 404 error in a dependent request. If you are in a different situation, could you give us more details?
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Hi Aff,

you basically need more than 1 computer.. try to get such as 1 computer for Controller and a few PCs for Agents.. by putting agent and controller at the same computer, the result will not be accurate.

To load 1000 users for a simple system, that will be fine.

But, make sure you start at small number of users, and check the CPU load if it can handle such number of users.

YOu can check the CPU utilization and etc from the perfmon in ur server.

Run time setting is based on what is ur need. If you think all this 1000 users will be using the system for 1 hour flat, then set it as 1 hour.

Benny.
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Hi Affu,

Let me clairfy one part of your question. Are you saying that your Application you want to test (the System Under Test) will also be on the same box as your Controller, Agent?

This would invalidate the testing given that you want to monitor the CPU utilization, Memory consumption, etc.

The controller, agents also require memory, cpu, etc. Also, if you are executing the load test in the local configuration, not using a controller, agent, then your test process will only use a Single CPU on the system, even if you have more. Thats why its important to size your Controller, Agent(s) correctly so you will not skew your results by overloading your client.

Hope this helps.
Robert