Models: 143 MINLPs from the GAMS MINLPLib that can be managed by all solvers (i.e., no trigonometric functions, no SOS or semicontinuous variable, below var/equ.-limit of Gams/LindoGlobal licence), only 38 of the models are convex

Solvers:

1. BARON 8.1.5 (as in GAMS 22.8.1) with optionfile

   epsr 0.01
   contol 1e-6
   maxtime 3600
   PEnd 10
   PDo 100
   

   (the latter two options reduce the amount of probing done by BARON and have shown to give slightly improved results on this set of instances compared to the default setting)
2. LINDOGLOBAL 5.0.1.292 (as in GAMS 22.8.1) with optionfile

   SOLVER_FEASTOL 1e-6
   

3. AlphaECP 1.63 (as in GAMS 22.8.1) with optionfile

   epsilon_g 1e-6
   

4. BONMIN 0.99 with optionfile

   bonmin.algorithm B-BB
   

   using Bonmin/stable/0.99 rev. 1325 (26.08.08), CoinUtils/stable/2.3 rev. 1070, Clp/stable/1.8 rev. 1265, Cgl/stable/0.53 rev. 680, Osi/stable/0.99 rev. 1288, Cbc/stable/2.2 rev. 1052, Ipopt/stable/3.5 rev. 1314, MA27, MA28, MC19, Netlib Blas, Netlib Lapack
   with extra compiler flags: -DCLP_FAST_CODE -DCOIN_FAST_CODE -DCOIN_USE_RESTRICT -DNEW_STYLE_SOLVER=0
5. DICOPT 2x-C (as in GAMS 22.8.1) with optionfile

   mipsolver cplex
   nlpsolver conopt
   maxcycles 10000
   stop 1
   

6. SBB (as in GAMS 22.8.1) with optionfile

   rootsolver conopt.1
   subsolver conopt.1
   acceptnonopt 1
   memnodes 9999999
   

   and conopt optionfile

   Rtmaxv 1E+20
   

7. OQNLP (as in GAMS 22.8.1) with optionfile

   FEASIBILITY_TOLERANCE          1e-6
   ITERATION_LIMIT                100000000
   ITERATION_PRINT_FREQUENCY      100
   LOGFILE_ITN_PRINT_FREQUENCY    100
   MAX_SOLVER_CALLS               100000000
   MAX_SOLVER_CALLS_NOIMPROVEMENT 1000
   MAXTIME                        3600
   NLPSOLVER                      conopt.1
   

   and conopt optionfile

   Rtmaxv 1E+20
   

• CONOPT 3.14S (as in GAMS 22.8.1)
• CPLEX 11.1.1 (as in GAMS 22.8.1)

Timelimit: 3600 seconds
Gap tolerance: 1%

Platform:

• Intel Core 2 Duo CPU T9300, 2.5 GHz, 4 GB RAM
• Linux 2.6.22.18, SuSE Linux 10.3, 32 Bit
• gcc 4.2.1

The following modifications on the generated tracefiles have been made manually:

• LINDOGLOBAL: The model status had been changed from optimal (1) to integer feasible (8) if the gap (objective value - objective estimate) was nonzero.
• OQNLP: Due to large differences between the reported resource usages (cputime) and the measured wallclock time, all resource usage have been replaced by wallclock times.
• SBB: Due to large differences between the reported resource usages (cputime) and the measured wallclock time, all resource usage have been replaced by wallclock times.
• ALPHAECP: For instances where the resource usage differed by more than 10% from the wallclock time, the resource usage was replaced by the wallclock time.
• DICOPT: For instances where the resource usage differed by more than 10% from the wallclock time, the resource usage was replaced by the wallclock time.

Results