is it still necessary to perform presolve with hints?

[Li Mike]

I'm using the pywraplp SAT solver to solve a large model. My solution steps are as follows:

1. First, solve with a 0 objective, solver.Minimize(0), to get an initial solution.
2. Use the initial solution as a hint to warm-start the full objective model.

My problem is that the presolve in step 2 is taking a long time (3 minutes).Given that I have an initial solution, is it still necessary to perform presolve?Can I completely disable presolve in step 2? How can I completely disable presolve?

[Laurent Perron]

parameter: cp_model_presolve:false

I would first print the log, and check which operation is costly. Usually cp_model_probing_level:0 is enough to reduce presolve time.

But in general, presolve is useful and beneficial.

Laurent Perron | Operations Research | lpe...@google.com | (33) 1 42 68 53 00

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