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Date: Wed, 28 Jul 2010 09:13:52 +0200
From: Felix Frank <ff@mpexnet.de>
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To: JMeter Users List <jmeter-user@jakarta.apache.org>
Subject: Re: constant rate testing (again)
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Hi Deepak,

all of the below is true and quite accurate. The trouble with Jmeter is
that it is too "patient", and even starting 1000 threads or more won't
inject the same level of stress to on your server as a couple hundred
real world users would. That's because Jmeter will gladly stand by for
minutes at a time. Finding your throughput plateau is fine and all, but
it would be nice if I could wreck the webserver the same way a swarm of
real users will.

Regards,
Felix

On 07/27/2010 10:57 PM, Deepak Goel wrote:
> Hey
> 
> Namaskara~Nalama~Guten Tag
> 
> Just another though to this:
> 
> If your load is reaching the servers, looks like the max load which your
> server system can handle is that of one Jmeter server. When you add more
> servers, the throughput will reduce as the max throughput of the system has
> already been reached. After the max throughput has been reached, if you
> increase the load, the throughput starts dropping as your server cannot
> handle so many concurrent sessions simultaneously creating an overhead on
> the execution of all the request in the system.
> 
> For any system, you have to know what is the max throughput which it can
> achieve beyond which the response time starts increasing exponentially. The
> throughput then reaches a plateau, and if you increase the load further the
> throughput would start decreasing and the system might even crash.
> 
> I guess thats what happens in real world scenarios too. For example: In
> normal shopping periods, the system is able to manage the real user load
> with reasonable response times. During festive times, the system gets too
> drained out with the incoming request, and the response time increases
> exponentially. This causes a constant throughput and sometimes even the
> system to crash.
> 
> Did you try this option?
> *****************************************************
> Or is all of this complicated setup == a
>> large thread group + long ramp up period?
> *****************************************************
> Deepak
> 

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