Runtime / Work vs Presolve

Answered

Dimi Defillet

July 13, 2023 07:10

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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Comments

3 comments

Official comment
Simranjit Kaur

Gurobi Staff

November 13, 2026 01:40
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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
Ok, I see

Thank you David!
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