Add private solver license in GAMS

GAMS
1

Hello,

I own independent license for both Gurobi and Xpress solvers. These licenses have also been added to the PATH. However, I am not able to tell GAMS that I own these licenses. I tried to have a look at the documentation, but I found it confusing.

So, I would appreciate any help on how to make my GAMS installation to use my private licenses for these two solvers.

I am using GAMS 31.1 on a win10 64bit machine.

2

Hi
For this you will need for both solvers the Gams solver-links, otherwise Gams has no way of interfacing with them. You can find the prices for these links on the Gams homepage.
CHeers
Renger

3

If you don’t want to use the professional GAMS/Gurobi and GAMS/Xpress link components, you can also use the “free” OsiGurobi and OsiXpress GAMS links (seehttps://www.gams.com/latest/docs/S_OSI.html). You don’t need the Xpress or Gurobi software installed. GAMS comes with all the required software, but your license for Gurobi and Xpress must allow to run the solver versions that come with GAMS. For GAMS 31 this is Gurobi 9 and Xpress 35 (there are multiple version number with Xpress, this is the one we mention in https://www.gams.com/latest/docs/S_MAIN.html#SOLVERS_SUPPORTED_PLATFORMS). You find more information how to connect a solver license to GAMS here: https://support.gams.com/solver:how_do_i_get_set_up_to_run_with_a_gams_gurobi-link_license and https://support.gams.com/solver:how_do_i_get_set_up_to_run_with_a_gams_xpress-link_license.

Good luck!
-Michael

4

@bussieck

Thank you for the clarification. The “Osi” solution works perfectly!

I find quite confusing how GAMS is linked to individual (or private) solver license. I believe that a box during installation where you can specify the location for your license -if any- would be useful.