Gurobi reports UNKNOWN_RESULT_STATUS when Solution count = 10

odow · September 12, 2025, 6:26am

You can see the code here. The solution violates the tolerances so we return unknown.

src/MOI_wrapper/MOI_wrapper.jl

df30cad45


      
              if !(1 <= attr.result_index <= valueP[])
                  return MOI.NO_SOLUTION
              elseif term in (MOI.OPTIMAL, MOI.SOLUTION_LIMIT)
                  # Assume that if Gurobi tells us the problem is optimal, or if it found
                  # too manny solutions, then we have a feasible point.
                  return MOI.FEASIBLE_POINT
              elseif _is_primal_feasible_to_tolerance(model)
                  # Feasibility of solution is unknown. Check for violations.
                  return MOI.FEASIBLE_POINT
              end
              return MOI.UNKNOWN_RESULT_STATUS
          end
          
          """
              _is_primal_feasible_to_tolerance(model::Optimizer)
          
          This function checks whether a solution stored in `model` is feasible according
          to:
          
           1. `max(BoundVio, ConstrVio) <= FeasibilityTol`
           2. `IntVio <= IntFeasTol` (if applicable)

Topic		Replies	Views
Problem about solution of Gurobi in Julia in JUMP Optimization (Mathematical) question , package , jump , gurobi	5	152	September 29, 2025
Solver iterates then declares model infeasible - what could explain this behaviour for a linear problem? Optimization (Mathematical)	7	1661	November 5, 2019
Gurobi reports OPTIMAL on a QP having a huge MaxVio Optimization (Mathematical) jump , gurobi	8	159	July 4, 2025
Help Couenne Optimization (Mathematical)	23	3850	January 22, 2019
Strange error when using Cbc for MILP => "This application has requested the Runtime to terminate it in an unusual way" Optimization (Mathematical)	2	880	February 27, 2020

Gurobi reports UNKNOWN_RESULT_STATUS when Solution count = 10

Related topics