aldorexbraam

Concurrency issue with PI Datareference under high load ?

Discussion created by aldorexbraam on Mar 5, 2012
Latest reply on Mar 7, 2012 by pcombellick

 

 

Hi I have some curious findings in while doing load tests with Visual Studio 2010.

 

The test results lead me to the conclusion that there is a threading issue with the PI datareference.

 

This is the test scenario:

 

Start with 1 user doing requests to an Element attribute value and add 5 users every 25 seconds: Objective is to find the ‘breaking point’ of the server and determine concurrency capabilities of AF.

 

This is the observed behavior:

 

Configuring the attribute with a constant value results are not blocked

 

Configuring the same attribute with a pi value results are blocked  (see figure 2 and 3)

 

 

 

Question to the forum: Has anybody performed similar test and observed the same behavior and are there any known issues wrt. the PI datarefence ? 

 

 

 

Figure 1: using AF using a constant attribute value

 

0576.Figure1.png

 

Figure 2 Using AF with the PI data reference

 

4011.Figure-2.png 

 

Figure 3: Figure 2 Using AF with the PI data reference, detail view

 

5226.Figure3.png

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