Function Module call exponentially slowing down

[Former Member]

I’m going through our EarlyWatch list to reduce runtime of the poor performing programs. The one I’m addressing now runs within 2 minutes without a function module call, but nearly 2 hours with it. It has 1,200 calls to the function and starts by performing 10 per second. By the time it gets to 500 it’s doing 1 call every 3 seconds. It’s a Z function module that is quite intricate and I don't want to change it.

I’d like to know if there is a way to clear all memory used by the function module (and it's global data) with a single command - outside the function module - before and after calling it? This way I can be sure it has a “fresh” start every call. I believe it is a memory issue, because if I run the program for e.g. 500 entries and I run the last processed entry in SE37 it runs immediate without the 3 second slow down/delay.

Best regards,

Adrian

[Former Member]

You could call function with addition AS SEPARATE UNIT.

This would be a shortcut to get around global memory issue.

[Pawan_Kesari]

Function module global data is often used to buffer values and make subsequent calls faster. I am not sure clearing global data, if possible, is the right approach.

My opinion, I don't think there is any easy way,  you will have to go through the code of both calling program and function module to see why its taking time.

Regards,

Pawan.