Re: Load testing with JRobin and Newts

Hi Fred,

There could be numerous reasons if you are using JRobin. Disk IO can be a
problem but a more generic problem which will effect RRD or Newts
collection can also be if you have delays in your SNMP simulation agents
responding to requests. This also depends upon how much data you are
retrieving on each poll of the MIB.  If the remote agents are not
responding on time, it is possible that you have all of the data collection
threads tied up waiting for the SNMP agents to complete requests. You can
also look at OpenNMS's internal JVM stats using JMX to see if you have a
memory or GC problem. Typically make sure collectd has enough threads and
you are running with plenty of memory.

There is a blog entry here on performance tuning
https://wiki.opennms.org/wiki/Performance_tuning

Hope this helps

Craig

Craig Gallen

On Thu, Jun 28, 2018 at 9:14 AM, Smartoss Smartoss <[email protected]>
wrote:

> Hello,
>
> I am currently performing load testing to compare JRobin and Newts (and
> then prove that OpenNMS can fulfill our needs thanks to Newts)
> At the moment, I am using two virtual machines. One with OpenNMS and the
> other with an SNMP agent simulator to generate to load.
>
> So I'm beginning with JRobin but first I have a few questions, I already
> know that the bottleneck will be disk writes, but what exactly causes the
> holes in the graphs?
>
> Is it because the worker threads (from collectd?) are waiting for disk I/O
> and therefore can't collect data from SNMP agent?
>
> Thank you,
>
> Fred
>
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