xpress.opt & VEDA_FE
#1
Dear Amit,
I see that the cplex.opt is a part of VEDA_FE. Is it possible to also include xpress.opt?
Pernille
Reply
#2
Hi Pernille,
If you click on the down arrow you'll see XPRESS.
Gary
Reply
#3
Dear Gary and Amit,

I meant that you are not able to specify the solution algorithm, barrier options and number of threads directly in VEDA_FE. This needs to be defined in the xpress.opt file while it can be defined directly in VEDA_FE for CPLEX.

Pernille
Reply
#4
Hi Pernille,
Pernille.S Wrote:I meant that you are not able to specify the solution algorithm, barrier options and number of threads directly in VEDA_FE. This needs to be defined in the xpress.opt file while it can be defined directly in VEDA_FE for CPLEX.

Are you not able to do that?  When I first select Xpress in the Case Manager, and then click on XPRESS, I get a dialog where I can select the algorithm and number of threads for Xpress.

[Edit:] You are right it does not seem to work very well; For example, the number of threads specified doesn't get written into the options file.
Reply
#5

I apologize for my unclear and somehow not correct question.

 

Yes, I can define algorithm method (simplex or barrier) and I can choose number of threads but I am not able to include rerun in VEDA_FE, but this is possible with CPLEX. Also the option file has more options for CPLEX than XPRESS in VEDA_FE (but I just need rerun at the moment).

Pernille

Reply
#6
You are right Pernille, VEDA gives you control over very few solver options. I will think of a better approach, but here is what you can try for immediate relief: just write all the options you want in cplex.opt in your gams_wrk folder and dont click the CPLEX button on the solve form after this. VEDA writes solver options only when instructed from the solver options form.
Reply
#7
Pernille,
In the meantime you can trying sticking your own XPRESS.OPT in the GAMS_WrkTIMES (run) folder and selecting the OTHER option - it should leave the OPT files alone (though needs to be tested to confirm).
Gary
Reply
#8
Thank you for the suggestion. I usually include my own xpress.opt file in each GAMS_Wrk folder but I choose the XPRESS option in VEDA_FE and this seem to work. Why should I choose OTHER?
Pernille
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)