DP function limitation

[paramesh1985]

Hi,

I just want to know is there any limitation for dp_fct function in a redundant project.

In our project we are using around 23965 dp-fucntions it will affect any WinCC OA performance.


regards,

r.paramesh

[leoknipp]

The number of dp functions is not an indication if it will affect the performance.
Also you have to differ between dp functions and statistical functions. For both types the same config _dp_fct is used.

In case of dp functions it is more interesiting how often the functions are triggered and how complex the calculation/formula is which is used at the dp functions.
When using statistical functions you have to look which calculation interval is defined and how many dp elements are using a short calculation interval. Also you have to check if intermediate values shall be calculated (which is normally not necessary) and if the initialization with archived data during startup is made.

Best Regards
Leopold Knipp
Senior Support Specialist

[Gertjan van Schijndel]

The startup of the event manager will definitely take longer with this number of dp-functions.

[leoknipp]

I made a test with a project where dp functions and 21698 statistical functions are configured.
For the test the number of dp functions was changed.
In the following list total number of _dp_fct configs is given (dp functions + statistical functions)

21704 dp-functions - startup time for the Event Manager 6 seconds
48714 dp-functions - startup time for the Event Manager 8 seconds
81725 dp-functions - startup time for the Event Manager 11 seconds

I do not see a problem for the startup time if 24000 dp functions are configured.

The test was made on a Desktop PC with Windows 10 and a Intel Xeon CPU E5-1620 v2 @ 3.7 GHz, 32 GB RAM and a HD as storage.

Best Regards
Leopold Knipp
Senior Support Specialist

[paramesh1985]

hi,

Ok thanks i will check this one.

dp_fct function will execute only in the active server. Similarly how it will behave in the DRS system.


Now dp_Fct function is executing in both the DRS system independent of which one is active.

[leoknipp]

A dp function is executed by the Event Manager.
It is done all the time without taking into account if the Event Manager is running on the active or passive server.

Best Regards
Leopold Knipp
Senior Support Specialist