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From UBIK LOAD PACK Support <supp...@ubikloadpack.com>
Subject Re: Backend Listener and reduced throughput
Date Wed, 16 Dec 2015 13:47:32 GMT
Hello,
Did you try playing with Async Queue Size 5000 might be very short for a
test that has no timer?

The difference can be explained by many factors:

   - Network quality between JMeter and the InfluxDB or Graphite server
   - Number of Samples that you track
   - The queue size, if you test is at high throughput (no timer), then the
   Async Queue Size will slow down compared to no using backend listener.
   - Bear in mind also that Increasing Async Queue Size will increase
   memory footprint

Regards

On Wed, Dec 16, 2015 at 2:38 PM, Steven Swor <sworisbreathing@gmail.com>
wrote:

> Generally speaking, performance degradation is a known issue with all
> listeners (more processing = more cpu cycles consumed per loop). However,
> with the GraphiteBackendListener(
>
> https://github.com/apache/jmeter/blob/v2_13/src/components/org/apache/jmeter/visualizers/backend/graphite/GraphiteBackendListenerClient.java
> ),
> there seems to be a lot of thread synchronization going on, which could
> potentially be contributing to a performance degradation. It's hard to say
> for sure, though, without doing some actual measurements on it.
>
> On Wed, Dec 16, 2015 at 8:45 PM, Bhadauria, Tarun Kumar <
> tarun.kumar.bhadauria@zalando.de> wrote:
>
> > Test Summary -
> >
> > Jmeter Version - 2.13
> > Jmeter Machines - 10 AWS EC2 m4.4xlarge instances
> > Number of threads on each instance 72 hence in total 720 threads in
> > distributed mode
> > Test is executed in non GUI mode
> >
> > I was experimenting with Backend listener as described here
> > <http://jmeter.apache.org/usermanual/realtime-results.html> and came
> > across
> > drastic reduction in throughput against a static html file. These are the
> > results are received for 5 minutes test -
> >
> > Throughput with backend listener - 5000/sec
> > Throughput without backend listener - 9800/sec
> >
> > I have repeated the test over a period of one week and test results have
> > been consistent.
> >
> > I did not see any significant difference in load avg or cpu utilization
> on
> > load agents with or without backend listener.
> >
> > Is JMeter performance degradation a known issue with Backend listener?
> >
>



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Regards
Ubik Load Pack <http://ubikloadpack.com> Team
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Cordialement
L'équipe Ubik Load Pack <http://ubikloadpack.com>
Suivez-nous sur Twitter <http://twitter.com/ubikloadpack>

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