OPCDA Memory Leak - by: spicerno

Hi,
We have a .NET Framework application that was recently migrated to .NET6.
We ran into a memory leak problem using OPCDA.
The .NET6 application with version 5.63.246 had no memory problems, they started after the package was upgraded to 5.71.334.

The application can be configured to switch between OPCDA and OPCUA, and the code is the same for both cases, except for the use of a different client.

Using OPCUA there are no problems:


While on the same machine using OPCDA there is a slight increase (about 50 signals on matrikon simulation server):


on a machine that reaches a non-simulated server and reads many more signals, the increase is greater:


We have seen that a new version (5.71.401) has been released, we are trying it out, but we will probably get the same result.

We have created a reduced application of our own, which only includes the plugin using quickOPC.
If necessary, we can provide you it.

NB. in the Framework version we had these parameters, which should not be necessary in .net6:

right?

can you help us?

Thank you