Threads

[Lists <li...@dankeeley.co.uk>]

Hi,

I have a system which has an average response time of 50ms and a standard
deviation of 200.

At the moment I run with a target throughput  of 60 requests per minute per
thread.

So that means I'll run into problems when responses go over 1 second because
the thread will get "behind" its target.

So I guess this means i'm running at quite a high load on each thread? Would
that be right?

The problem i have is that if i double the number of threads then my arrival
rate starts getting into a weird 20 second loop of wildly varying rates,
e.g. it jumps up and down by as much as 100 trx/s.  So I want to guage how
hard to push each thread based on the performance of the system, and then
maybe work out how to bring in additional jmeters.

I know questions like this are a bit of a how long is a length of string
kind of question!  But any numbers would help!  ( I run headless via the
jmeter ant task. )

Thanks,
Dan

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Re: Threads

[sebb <se...@gmail.com>]

On 27/03/2008, Lists <li...@dankeeley.co.uk> wrote:
> Hi,

Version of JMeter? Java?

>  I have a system which has an average response time of 50ms and a standard
>  deviation of 200.
>
>  At the moment I run with a target throughput  of 60 requests per minute per
>  thread.

And how many threads?

>  So that means I'll run into problems when responses go over 1 second because
>  the thread will get "behind" its target.
>
>  So I guess this means i'm running at quite a high load on each thread? Would
>  that be right?

JMeter can handle much higher rates than 1 per second, but perhaps not
for many hundreds of threads.

Whether the load is high depends on whether the server is designed to
handle that load or not...

>  The problem i have is that if i double the number of threads then my arrival
>  rate starts getting into a weird 20 second loop of wildly varying rates,
>  e.g. it jumps up and down by as much as 100 trx/s.  So I want to guage how
>  hard to push each thread based on the performance of the system, and then
>  maybe work out how to bring in additional jmeters.

What happens to the sample response times? Are these also varying wildly?

To see whether a JMeter limitation is being reached, try spreading the
load between two instances of JMeter.

>  I know questions like this are a bit of a how long is a length of string
>  kind of question!  But any numbers would help!  ( I run headless via the
>  jmeter ant task. )
>
>  Thanks,
>  Dan
>
>  ________________________________________________
>  Message sent using UebiMiau 2.7.10
>
>
>
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