threadgroups etc

[Jorg Heymans <jh...@domek.be>]

Hi,

How come i get more throughput on my application when i create two 
identical threadgroups (with one sampler), then when I create one 
threadgroup with two identical samplers?

Adding more threads to a threadgroup means lower throughput, although 
the CPU's are not maxed out. Adding another identical threadgroup means 
a higher throughput.

If threads in a threadgroup simulate concurrent users, what effect have 
identical threadgroups then?

How can i make sense of all this?


Thanks
JOrg


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Re: threadgroups etc

[Jordi Salvat i Alabart <js...@atg.com>]

You're right in that the throughput should generally increase as you add 
threads -- unless you're really saturating some resource.

However, 2 threadgroups with N threads and 1 sampler will usually 
generate more throughput than 1 threadgroup with N threads and 2 
samplers. To be equivalent, the 2nd case should be 1 threadgroup with 
2*N threads and 2 samplers. In fact, the number of samplers does not 
matter at all, if you think about it. Only the number of concurrent 
threads matters.

-- 
Salut,

Jordi.


En/na Jorg Heymans ha escrit:
> Hi,
> 
> How come i get more throughput on my application when i create two 
> identical threadgroups (with one sampler), then when I create one 
> threadgroup with two identical samplers?
> 
> Adding more threads to a threadgroup means lower throughput, although 
> the CPU's are not maxed out. Adding another identical threadgroup means 
> a higher throughput.
> 
> If threads in a threadgroup simulate concurrent users, what effect have 
> identical threadgroups then?
> 
> How can i make sense of all this?
> 
> 
> Thanks
> JOrg
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> 
> 


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