Exploding memory CBC solver with 1.14.2 compared to 1.13.0

Assessment

Research direction

Description

Describe the bug
The CBC solver uses significantly more memory for the same problems since upgrading from mip 1.13.0 to 1.14.2. In some cases this increase is of such magnitude it causes OOM errors in the container.

To Reproduce
Set up Linux container and solve the attached LP problem with mip 1.13.0 and 1.14.2.

PayloadA copy.txt

Expected behavior
Similar memory usage for mip 1.14.2 as in 1.13.0

Desktop (please complete the following information):

• Operating System, version: Linux container
• Python version: 3.9 and 3.12
• Python-MIP version (we recommend you to test with the latest version): 1.14.2 vs 1.13.0

Additional context

Comparisons for 5 use cases between different mip and python versions

Getting set up

First steps

1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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