Marcus Garvie
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Latest activity by Marcus Garvie
Marcus Garvie commented,
Thank you. My next step is giving Gurobi a long time to tune a smaller version of the model.

Marcus Garvie commented,
Thank you. My plot is showing only the phase 1 stage. With regard to your second question, as I mentioned, if the time is greater than the NoRelHeurTime Gurobi runs basically indefinitely. I was in...

Marcus Garvie commented,
Ok, I can add a bit more information to this question. I tried the strategy of setting NoRelHeurTime to infinity for my very big BLP problem and ran it over night. I then plotted relaxation numbers...

Marcus Garvie created a post,
Need help on understanding the NoRelHeurTime parameter
AnsweredHi everyone, I've been solving a class of binary linear programming (BLP) problems with no objective function. I seek a single feasible solution. I've found acceptable runtimes using Gurobi v 10.0 ...

Marcus Garvie commented,
Thanks Mario.That is useful. I had thought that in Gurobi 'MIPFocus = 1' and 'SolutionLimit = 1' roughly corresponds to 'set emphasis mip 1' and 'set mip limits solutions 1' in CPLEX, respectively....

Marcus Garvie created a post,
Parameters for finding a single feasible solution of an MIP problem
AnsweredHi everyone, I am solving pure binary linear programming problems in Gurobi v10.0 with no objective function. I understand the importance of tuning, which hasn't been very helpful for my problems (...

Marcus Garvie commented,
Thank you Jaromił. Was Gurobi able to solve these smaller models in a decent amount of time? Yes. For a model that is very similar, Gurobi solved it in about a minute! Another related model (but ...

Marcus Garvie created a post,
Behaviour of IntInf in the branchandcut tree search log
AnsweredHi everyone, I've been running a very tough pure binary LP problem with zero objective function in Gurobi. I'm happy to wait several months if that's what it takes to get a solution. I have experim...

Marcus Garvie commented,
Thank you Matthias, that is very helpful. So as I explore the effect of different parameter sets I know what to look for. Best, Marcus.

Marcus Garvie commented,
Hi Matthias, we didn't deliberately construct a hard model. After a years' worth of work we managed to convert the Eternity puzzle into an LP problem. This is a notoriously difficult tiling problem...