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How to decide number of Vusers, Think time and Pacing for load testing

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Hi All


What is the initial requirement for work load characteristics? And How to calculate number of Vusers, Think time and Pacing for load testing.

 

Is there any work sheet for this , Please help me on this,

 

The needful is highly appreciated.

 

Regards,

Shankar N

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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ask prod support following

 

max user running per hour, no of total users in application

top 10 use case & its users
how many logins per hour

users from where like ET, CT or international

no. of hits, throughput on the servers at the max, average

what kind of Data in the DB, maybe top 10 accounts or something like that. make sure DB records match between perf and prod.

 

what is the cpu, memory or any other important resource related Data

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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It all boils down to what does the client want?

 

Are there production metrics you can gather information around?  Are there any expected load patterns?  What's the goal of the test?  Break something?  Find a certain threshold?

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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The sample application in peak duration of one hour 350 users logging in, this is the only thing I have then how could I design the scenario with the below elements?

1 .Think time to decide

2. Pacing

3. Ramp up duration

4. Ramp down duration.

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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You really need to get more information.

 

Is the requirement really only 350 logins in an hour?

 

Is that all they do?  Login?  Nothing else?

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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That's my question here....what kind of requirement I should gather....

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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Hi,

 

Loadrunner and Performance Center are used to test a specific set of requirements that are usually obtained from the developers of the Application Under Test (AUT).

There is not a method or worksheet to help you determine how to build your test.

You will need to find out more information such as what Business processes need to be executed after logging in - what is the peak number of users that will be simultaneously logged in. Only then, once you get the basics of what the developers want to test, can you consider how your test needs to be built.

 

Regards,

HP Support

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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ask prod support following

 

max user running per hour, no of total users in application

top 10 use case & its users
how many logins per hour

users from where like ET, CT or international

no. of hits, throughput on the servers at the max, average

what kind of Data in the DB, maybe top 10 accounts or something like that. make sure DB records match between perf and prod.

 

what is the cpu, memory or any other important resource related Data

View solution in original post

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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Hello All,

I have created an iOS app from which you can set/calculate all you performance testing scenarios on your iPhone/iPad/iPod touch.

Hope it helps the performance testing community.

App Store Link:
https://itunes.apple.com/us/app/pacing-calculator/id656498467?mt=8

Support Site/Tutorial Link:
http://krangiosdev.wix.com/pacing

If you need help shoot me an email at my support site.

Cheers,
Kiran

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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Pacing Calculator:

http://perfmatrix.blogspot.in/2016/11/pacing-calculator.html

No. of Users Calculator:

http://perfmatrix.blogspot.in/2016/11/no-of-usersthread-calculator.html

Regards,
Gagandeep Malviya

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Re: How to decide number of Vusers, Think time and Pacing for load testing

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Below are some formulas  to calculate these values -

1.   No. of Concurrent Users(N) = Throughput or TPS(X)  *  [ Response Time (RT)  + Think Time (TT) + Pacing (P) ]

2.   Pacing (in sec) = (No. of Users/TPS) - E2E response time (in sec)

        ##Note - It is advisable to take 10% deviations of pacing

3.   Think time - You have to decide as per your requirement in scripts 

4.  E2E response time - run your script in LR ( without think time and pacing delay )  and capture total time

 

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