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Terminated by The Solver

  • 26 April 2024
  • 3 replies
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Wanie Saidi
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Hi,

I am solving a huge MIP (4446310 integer variables). I set the relative gap to 0% from CPLEX MIP settings. After 69532.16 sec (19.3 hours), the model stops running and the solver status says 'Terminated by solver' while the gap is 0.14%. Why does this happen? What are the possible causes? Thank you.

 

Best regards,

Wanie Saidi

 

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Best answer by Marcel Hunting 26 April 2024, 11:09

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waniesaidi

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Marcel Hunting
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HI @Wanie Saidi. Probably CPLEX ran out of memory. I strongly recommend to print the CPLEX status file by setting the following options:

  • Solvers General option 'Solver listing messages' to 'All'
  • CPLEX option 'MIP display' to 'Nth node + info on node cuts'
  • CPLEX option 'Parameter display' to 'Yes'

The CPLEX status file will be printed in the log folder. It contains useful information about the solving process. See also this topic.

Marcel - AIMMS Optimization Specialist
Wanie Saidi
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Thank you @Marcel Hunting for the recommendations. I’d like to understand if this issue is solely due to CPLEX running out of memory, or if there might be other factors contributing to the problem. Could you provide further insights into possible alternative causes that could lead to the issues?

Best regards,
Wanie Saidi

waniesaidi
Marcel Hunting
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Hi @Wanie Saidi. The only realistic possible cause that I see is lack of memory (or lack of disk space, if the node file is written on disk). The CPLEX status file should tell you more.

Marcel - AIMMS Optimization Specialist

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