"out of memory" error

Answered

Bahar Nasirian

August 01, 2022 08:13

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Hello,

I am trying to solve a MIQP problem, but I receive the "out of memory" error. I tried to set NodefileStart parameter to 0.5 and Threads parameter to 1-8 & 32, but I still receive the "out of memory" error.

Thanks a lot for any help.

Related to

• Memory

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  Matthias Miltenberger

  • Gurobi Staff

  August 01, 2022 09:41

  Hi Bahar,

  There are a lot of general constraints in your model - these may need to be reformulated during presolving which can require more memory. You should try solving a smaller model to get an idea of how much memory is necessary to handle what size of the problem.

  Alternatively, you could try running on a machine with more memory if that's an option. Since the solver runs into the memory limit very early on, it's not helpful to change the NodeFile parameter as the branching process has not even started.

  Cheers,
  Matthias

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  Bahar Nasirian

  August 01, 2022 19:45

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  Thank you so much for your guidance.

  Regards,

  Bahar

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  D

  September 26, 2023 23:23

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  How much RAM should be enough to run a complex model with 

  a model with 6336897 rows, 10316000 columns and 148118000 nonzeros
  Model fingerprint: 0x14661732
  Variable types: 2000 continuous, 10314000 integer (10314000 binary)

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  Simranjit Kaur

  • Gurobi Staff

  September 27, 2023 23:19 Edited

  It is hard to predict how much RAM is sufficient by just looking at the model size. Sometimes, solving a smaller model can require a lot of memory, while a larger model may not. Please have a look at our article What hardware should I select when running Gurobi? for general recommendations on how to choose hardware when running Gurobi.

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