11 Replies Latest reply on Mar 7, 2012 1:50 AM by pcombellick

    Concurrency issue with PI Datareference under high load ?

    aldorexbraam

       

       

      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