Constraint Generation Time: pywraplp, model_builder, mathopt

[Li Mike]

For the same model implemented using the pywraplp, model_builder, and mathopt​ interfaces, I tested the time taken to generate the same set of constraints:

• pywraplp: 7s
• model_builder: 5s
• mathopt: 20s

model_builder​ was the fastest at only 5s, while mathopt​ was the slowest at 20s. Is this performance difference normal?

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Considering Migration for HiGHS Support

I am currently using OR-Tools 9.14 with the pywraplp interface. My original plan was to migrate to mathopt​ to use the HiGHS solver, but the slow constraint generation time (20s) is making me hesitant.

I am now considering migrating to model_builder​ instead. Does the model_builder interface in OR-Tools 9.14 and 9.15 support the HiGHS solver and support hints to Highs?

[Li Mike]

I tried, it seems   pywraplp  and  model_builder interface in OR-Tools 9.14 and 9.15 support the HiGHS solver, but they didn't support   hints to Highs. Am I right?

[Ross Anderson]

I am assuming you the same person as in this github comment?

https://github.com/google/or-tools/pull/4737#issuecomment-4396872081

I have replied there.