I am trying to solve a multiple integer non linear programming problem. I have about 178848 decision variables and they are all binary. I am creating the .nl file from pyomo and then trying to solve this .nl file through command prompt with the command: bonmin test.nl
Before I get the error in the title, I see a sudden jump in memory wherein I see the memory usage jumping upto 100% before the program exits. Is there any settings I can pass to bonmin to prevent this error from happening? Or is there any heuristic options available which I can pass to bonmin?
That is a rather large integer program. Solvers have limitations, so it may simply be that Bonmin/CBC cannot handle a problem of that size with the available memory on your system due to the branch and bound tree getting too large. If there are any reformulations or preprocessing possible to reduce the problem size, you may want to try that before sending to Bonmin. You can also try giving branching priority settings, though I am less familiar with how up implement that.