Gurobi Stuck in Presolve

Lama HH

• May 15, 2019 04:41

I am trying to solve an IP with Gurobi. The model was reaching the optimal solution with smaller instances however once I increase the problem size, the solver gets stuck in Presolve. It reaches a certain point beyond which it seems to stop. It doesn't move on to root simplex or proceed with presolve.
I tried changing the parameters:
model.setParam("Presolve", 1)
model.setParam("PrePasses", 300)
but still the same problem occurs.
I also tried to set Presolve to 0 however the problem then gets stuck in root simplex, where it also never ends. I looked through some of the posted questions (someone mentioned cycling although I am not sure if this is the case here and if so how to solve it).

Thanks!

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  Daniel Espinoza

  • May 15, 2019 11:37

  Hi Lama,

  Could you share a link to the model?

   

  Daniel

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