Hello everybody. I am having an issue using the standalone glpsol solver: on some particular instances, the solver enters a never-ending elaboration (I let it run for 8 hours, when 20 seconds would be already a huge time for an instance of that size), without finding any solution. I am certain that the feasible solution exists because: 1. two other solvers (minos and Cbc) found it and 2. in case of non-existing solution, the solver should tell me that the instance is empty. Anyway, in the following you can find the model and the instance that gives the issue.
model: https://dl.dropboxusercontent.com/u/44504233/glpk_issue/glpk_model.mod instance: https://dl.dropboxusercontent.com/u/44504233/glpk_issue/glpk_input.dat *Interesting property*: the issue occurs on all the instances having Cores['ECONOMIC'] very small (=5 in the sample that I provided). I am using glpsol v4.55 on 64 bit ubuntu. The command line I use is simply glpsol --math --model glpk_model.mod --data glpk_input.dat Thank you for your time and attention. -- Mattia Buccarella
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