About the memory usage

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jiaze ma

• August 15, 2021 05:45
• Edited

I am running two MIP models using Gurobi, I call them A and B. B is the relaxed problem of A, and B has fewer variables, fewer constraints, fewer nonzeros, and fewer rows than A. Is that possible that solving B requires a higher RAM than solving A? (As I said B is the relaxed problem of A, and the two models are similar). 

By the way, I run a set of numerical experiments. I found that solving the relaxed problem is much faster than solving A. 

 

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• Official comment

  

  Simranjit Kaur

  Gurobi Staff

  • December 06, 2024 00:28

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
• 

  Jaromił Najman

  Gurobi Staff

  • August 17, 2021 09:25

  Hi,

  It is possible that a smaller problem requires more RAM during the solution process. One reason for this behavior may be that the heuristics solve more (and bigger) sub problems. It is also possible that the B&B tree is bigger for the smaller problem although it is solved faster in the end.

  Could you post the log files of both runs and state the specific RAM usage for both models?

  Best regards,
  Jaromił

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