At least on integer linear programs, I have found the performance of GLPK to be very disappointing, but I didn't notice any bugs. When compared to GLPK, gurobi

At least on integer linear programs, I have found the performance of GLPK to be very disappointing, but I didn't notice any bugs. When compared to GLPK, gurobi is usually orders of magnitude faster (I had programs which gurobi optimized in a few seconds, while GLPK couldn't even find a feasible solution in 24 hours). If you need a free solver with reasonable performance, you should consider the COIN-OR project [0]. [0] https://www.coin-or.org/projects/ https://www.coin-or.org/projects/