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