How to save a model file in memory rather than disk?

Answered

Jin Chengneng

March 13, 2023 07:24

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Dear all,

I am currently working on a large model and I am seeking your expertise on a matter. Currently, we construct the model in C++, but we need to add some constraints in Python. We then save the model as an MPS file in C++, which we then read in Python. Unfortunately, this process is taking up a significant amount of time.

I am wondering if anyone has any suggestions on how to optimize this process. Is there a way to store the model in memory rather than writing and reading it from a disk?

Thank you for your time and I appreciate any suggestions you may have.

Best regards,

Jin

Related to

• C++
• Python

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  Mario Ruthmair

  • Gurobi Staff

  March 13, 2023 10:47

  Hi Jin,

  Since it is usually not allowed to access the memory of a different process, here are some suggestions:

  • If you have enough memory, you could create a RAM-disk in your operating system, i.e., an area in your memory that behaves like a normal disk and has a path. Then you can write/read the MPS file to this RAM-disk.
  • You could communicate between the C++ and the Python process via REST (or something else) to send the model details from C++ to Python.
  • It might make sense to construct the whole model either in C++ or Python and just transfer the data needed for the model formulation.

  Best regards,
  Mario

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