Jmeter odd and even threadNumbers

Question

I have to simulate a scenario where I want 50% to use one http request and the rest for another request. I tried using the IF controller to split by threadNumber i.e. send the odd thread numbers to one side and even to another. I tried using the condition in IF controller in Jmeter as

 ${threadNum}' % 2 == '0'

and '${threadNum}' %2 != '0'

I tried with around 10 users and I always see them going only into the odd queue i.e. ${threadNum}' % 2 == '0' is never satisfied. Am i doing it the right way?

Have you tried `${threadNum} % 2 == 0`? – Ediac Jun 25 '15 at 19:45 — Ediac, Jun 25 '15 at 19:45

score 1 · Answer 1 · edited May 23 '17 at 12:30

1

Lots of problems here:

The JMeter function is __threadNum You lost the underscores somewhere. Ref
What data type do you expect ${__threadNum} to return? If it is a string, why would you do arithmetic (%2) on a string. If it is an int, why are you comparing it to a char ('0')?

As an aside, do not compare strings in java using the == operator. See here.

That being said, if you want half the threads to use a second sampler, why not setup two thread groups with half the number of threads each, with one of the two http requests under the two thread groups?

edited May 23 '17 at 12:30

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answered Jun 25 '15 at 20:29

RaGe

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To be more specific, i read the login ids and pwds for a set of users from a csv file. And I did use ${__threadNum} to get the thread number. I tried using a bean shell preprocessor to write it into a variable ${threadNum}, because it did not work right when i tried directly using ${__threadNum}. Each user group has to hit a button from different pages and this button click uses the same functionality. So I am basically testing a functionality when called by different users at the same time from different pages. Is there a way to test this using JMeter – user3920295 Jun 25 '15 at 22:45

score 1 · Answer 2 · answered Jun 26 '15 at 13:10

I would recommend using Throughput Controller, it will be much easier.

In regards to your question itself:

Even thread numbers If Controller condition: (${__threadNum} % 2 == 0)
Odd thread numbers If Controller condition: (${__threadNum} % 2 != 0)

If you're interested in more distribution options and ways of implementing them you're welcome to read Running JMeter Samplers with Defined Percentage Probability guide.

Jmeter odd and even threadNumbers

2 Answers2