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From Anthony Johnson <>
Subject Re: Multiple Jmeter Instances
Date Mon, 27 Dec 2010 16:44:27 GMT
The SimpleDataWriter could be your bottleneck as the test scales.  For
each sample an entry needs to be written to an output file.  So as
your test scales, so does the dependency on the speed of your
hard-drive.  This could also be compounded by the fact that you are
running in a VM which will have slower hard drive reads and writes and
may be missing some filesystem optimizations.

I would still suggest disabling the SimpleDataWriter and observing the effect.



On Mon, Dec 27, 2010 at 10:48 AM, alwaysbmore <> wrote:
> Well I was using 100 just as an example.  1000 is more realistic. So 1000 on
> a single instance compared to  500 split between two instances.  I'm running
> JMeter 2.4. on Windows Server 2003 which is a virtual machine.  I do not
> have any listeners expect for a Simple Data Writer.
> What I'm having hard time understanding is just the difference between
> running on a single VM and multiple VMs. If I was to run 1000 threads on a
> single Jmeter instance on one VM, my test runs fine, much lower response
> times and no errors. If I run two VM's both at 500 threads exact same test
> plan. My response times are a lot higher and I receive a lot more errors.
> They are mostly connection timeout responses.
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