Runtime / Work vs Presolve

Answered

Dimi Defillet

July 13, 2023 07:10

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Is it correct that the Runtime model attribute does not incorporate time spent in Presolve?

And what about the Work attribute?

Is there a way to retrieve the time spent in Presolve?

Thanks!

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  David Torres Sanchez

  • Gurobi Staff

  July 13, 2023 12:42 Edited

  Hi Dimi,

  The Runtime attribute does incorporate time spent in presolve (so does the Work attribute).
  You can see the time spent in the log. I don't think there is an easy way of extracting this otherwise.

  You could just compute the presolved model and time it using model.presolve():

  # populate model
  start = time.time()
  with model.presolve() as p:
      pass
  print(f"Presolve has taken {time.time()-start}s")

  Cheers, 
  David

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  Dimi Defillet

  July 13, 2023 23:20

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  Ok, I see

  Thank you David!

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