[Scip] SCIP 3.1 is slower than 3.0?

[Gerald Gamrath]

Hi Alessia,

I finally found some time for having a deep look at your code and found 
the reason for your code being slower with SCIP 3.1 after some debugging.

The CONSPROP-callback got a new parameter nmarkedconss, which you did 
not add to the propagation method of your NPP constraint handler (both 
in cpp and h). Without that, your propagation method was never called, 
but instead the default propagation method of the objective constraint 
handler, which does nothing.

Seems like your propagation method is quite important for the 
performance of your code. :-) After adjusting the parameter list of 
scip_prop in your constraint handler, it showed the same behavior as 
with SCIP 3.0.1.

BTW: Yet another reason for always removing all compiler warnings. ;-)

Best,
Gerald