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- You can see in the GAMSIDE what the available solvers are: File – Options – Solver. Those with a dot are available (those with – not). You can set the default solver for a specific problem (e.g. NLP) by clicking on the dot in the line with your solver of preference. I suppose GAMS just takes the first solver in the line.
- You can run gamsinst.exe (even if GAMS is already installed) from your GAMS directory and it will show the solvers it chooses as default.
- If you don’t explicitly choose one either in the GAMSIDE or using gamsinst.exe, and you want to solve your model with a non-default solver you can use an option in your model file specifying the solver. (e.g. Option nlp = PATHNLP;)
Hope this helps