If solver hits time limit, is a solution output?

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Sam Ganzfried

2020年02月04日 14:32

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I am just wondering if the time limit parameter is set and the algorithm hits the time limit, does it still output a solution (whatever the best/current iteration of the algorithm has produced)? Obviously it wouldn't be an optimal solution, but I am just wondering if an approximate solution is still output in this case.

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  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 03:18 編集済み

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
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  Yuriy Zinchenko

  • Gurobi Staff

  2020年02月04日 23:44

  Yes, the incumbent (if such is found) will be accessible through 'x' field of you variables.

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  Sam Ganzfried

  2020年02月05日 01:01

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  I just tried an example where model.get(GRB.IntAttr.Status) had a value of 9 (TIME_LIMIT status),

  and when I call get(GRB.DoubleAttr.X)

  I get:

  Exception in thread "main" gurobi.GRBException: Error at GRBVar.get
  at gurobi.GRBVar.get(GRBVar.java:124)

   

   

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  Yuriy Zinchenko

  • Gurobi Staff

  2020年02月05日 23:59

  You should check if the incumbent was found first, before querying for the X property.  You can do this by checking SolCount, https://www.gurobi.com/documentation/9.0/refman/solcount.html#attr:SolCount

  (please see our examples for more illustration in the online doc)

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