Log File in Gurobi 9?

Answered

Ahmad B

• December 05, 2019 16:12

Just updated to Gurobi 9. Was the log file output disabled by default in Gurobi 9?

If so, is there a way to permanently change the parameter responsible to always output a log file by default, as in Gurobi 8?

Thanks!

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• 

  Gwyneth Butera

  Gurobi Staff

  • December 05, 2019 16:23

  Hi Ahmad - 

  Yes, for v9.0 there is a change in the default for creating the logfile; the default log file only exits for gurobi_cl and the interactive shell with v9.0. Otherwise, you need to set the LogFile parameter.

  Gwyneth

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  Ahmad B

  • December 05, 2019 16:33

  

  

  

  Thanks for the quick reply.

  For someone who is used to having the log file outputting by default, setting the parameter each time I run a model is quite cumbersome. Is there a way to change the default value to avoid having to do this every time?

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  Vincent

  • April 22, 2020 23:23

  

  

  

  Hi,
  
  I am setting the LogFile parameter manually but the file is almost empty! The only part copied to my logfile is this:
  
  

  Gurobi 9.0.1 (win64) logging started 04/22/20 14:49:32
  
  Changed value of parameter LogFile to gurobi.log
  Prev: Default: 
  Parameter OutputFlag unchanged
  Value: 1 Min: 0 Max: 1 Default: 1
  Discarded solution information

  Would you please tell me what I am doing wrong or what's the correct way to set the LogFile parameter?

  Thanks.

  Ahmad B Gwyneth Butera

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• 

  Danial Ramin

  • September 30, 2020 16:16

  

  

  Hi Vincent,

  Make sure to put it before the "optimize" method.

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  Vincent

  • September 30, 2020 16:57

  

  

  

  That was actually the issue!

  Thank you Danial Ramin.

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