Re: [OpenSTA-users] Reading the results

[Dan D. <ddo...@me...>]

Chris,
If there is one key graph that captures the essence of stress testing it is
"timer values vs active users" -- as this illustrates the "scalability" of
the business process and "pages" of the app, i.e., "how does response time
vary as load is increased".

However, to assess "reliability" of the test, you need to look at the error
log and the http data list (filtered for >399 and <599 errors).  Too many
timeout, script, or http errors could invalidate your results, and you
should strive to at least explain if not eliminate most errors.

Also, a very key graph is Custom NT Performance, created by defining a
Collector that captures Bytes Sent and Bytes Received from your load
injector.  Graphed against Active Users, you can gauge whether there is a
bandwidth throughput  bottleneck somewhere in your system.

My opinion:  The opensta graphs are rather primitive and limited, and I much
prefer exporting Timers and graphing in Excel (using Pivot Tables to
summarize values into 1 or 2 minute intervals.  You can view examples on our
website).

..Dan
www.mentora.com
 
-----Original Message-----
From: ope...@li...
[mailto:ope...@li...] On Behalf Of Osoata,
Christabel
Sent: Tuesday, February 20, 2007 4:27 AM
To: OpenSTA users discussion and support
Subject: [OpenSTA-users] Reading the results

Hi All,
I am in the process of using OpenSTA for performance testing, however I
don't understand the graphs that are displayed for the result. Can
anyone please inform me the best graph to determine the performance of a
website application. There are currently several graphs but I'm not sure
what the results are showing, I want to be able to determine the
performance for different number of virtual users.

Many thanks
Chris


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