[SCIP] How to deactivate aging and avoid scip internal pricer ?

[Gerald Gamrath]

Dear Sandra,

I don't think that SCIPgetNPricevarsFound returns what you are 
interested in. As far as I can see, this is the total number of 
variables that were added to the to the pricestore. This may be 
variables "priced" by SCIP, but also the variables you priced, as well 
as all variables in your original formulation, that go through the 
pricestore once to enter the LP. Perhaps your original formulation is 
quite large?

Setting the age limit to -1 should normally do the trick. There are 
other things like "lp/cleanupcols(root)", but those are disabled by default.

When you look at the statistics after solving ("disp stat" in the 
interactive shell or SCIPprintStatistics()), you should see how many 
variables are really added by your pricer and by the internal SCIP 
pricing ("problem variables").  Is there a nonzero number for the latter?

Best,
Gerald

On 25.06.2018 18:28, Sandra Ulrich Ngueveu wrote:
> Hello,
>
> We are doing a Branch-and-Price with SCIP. Using function 
> "SCIPgetNPricevarsFound", we realized that a very higher number of 
> variables were "priced" by scip, compared to the number of columns 
> that we explicitely added (127253 instead of 475).
>
> We would like to deactivate such internal pricing (which according to 
> some forum is related to column aging) just to verify if the code 
> would be faster for our specific problem. We tried setting parameter 
> lp/colagelimit to -1, but the number of additional pricedvars declared 
> by scip remained unchanged.
>
> Could you please tell us if there is another parameter we could 
> activate or deactivate to achieve the desired behaviour ?
>
> Best regards,
>
> Sandra U. Ngueveu
>