I am trying to Solve a Non Linear model using Juniper with Ipopt and GiGHS. I am getting solution in my windows operating system, whereas Ubuntu OS is not giving any results immediately as it is saying NLP couldn’t solve optimally and No Integral solution found. I am using julia 1.6.1 in both OS and sampe packages with same version. Please find the log below for same model and help me out.
Windows OS:
Status of relaxation: LOCALLY_SOLVED
Time for relaxation: 81.11199998855591
Relaxation Obj: 7444.76604825103
MIPobj NLPobj Time
=============================================
Presolving model
257 rows, 160 cols, 514 nonzeros
65 rows, 64 cols, 130 nonzeros
0 rows, 0 cols, 0 nonzeros
Presolve: Optimal
Solving report
Status Optimal
Primal bound 11.1231861754
Dual bound 11.1231861754
Gap 0% (tolerance: 0.01%)
Solution status feasible
11.1231861754 (objective)
0 (bound viol.)
0 (int. viol.)
0 (row viol.)
Timing 0.01 (total)
0.01 (presolve)
0.00 (postsolve)
Nodes 0
LP iterations 0 (total)
0 (strong br.)
0 (separation)
0 (heuristics)
11.1232 0.0 25.2
FP: 73.69899988174438 s
FP: 1 round
FP: Obj: 7445.767441685866
Obj: 7445.767441685866
Ubuntu OS:
Start values are not feasible.
Status of relaxation: LOCALLY_SOLVED
Time for relaxation: 135.4964361190796
Relaxation Obj: 7444.653740204127
MIPobj NLPobj Time
=============================================
Presolving model
257 rows, 160 cols, 514 nonzeros
65 rows, 64 cols, 130 nonzeros
0 rows, 0 cols, 0 nonzeros
Presolve: Optimal
Solving report
Status Optimal
Primal bound 11.1229585924
Dual bound 11.1229585924
Gap 0% (tolerance: 0.01%)
Solution status feasible
11.1229585924 (objective)
0 (bound viol.)
0 (int. viol.)
0 (row viol.)
Timing 0.00 (total)
0.00 (presolve)
0.00 (postsolve)
Nodes 0
LP iterations 0 (total)
0 (strong br.)
0 (separation)
0 (heuristics)
┌ Warning: NLP couldn’t be solved to optimality
└ @ Juniper ~/.julia/packages/Juniper/0Z1vO/src/fpump.jl:405
11.123 - 53.5
FP: 53.602248191833496 s
FP: 1 round
FP: No integral solution found