Models: 81 NLPs with at least 1000 nonlinear nonzeros from the GAMS GlobalLib

Solvers:

1. IPOPT-1: Ipopt with MA27 as linear solver (Ipopt stable/3.5 rev. 1331, ATLAS 3.8.2, Lapack 3.1.1)
   

   linear_solver ma27
   tol 1e-8
   acceptable_tol 1e-8
   constr_viol_tol 1e-4
   compl_inf_tol 1e-4
   

2. IPOPT-2: Ipopt with MUMPS 4.8.2 as linear solver (Ipopt stable/3.5 rev. 1331, ATLAS 3.8.2, Lapack 3.1.1)

   linear_solver mumps
   tol 1e-8
   acceptable_tol 1e-8
   constr_viol_tol 1e-4
   compl_inf_tol 1e-4
   

3. KNITRO 5.1.2
   NOTE: The GAMS/KNITRO interface does not reformulate the constraint that represents the objective function as objective function. This may have an adverse effect on the performance of the solver.

   feastol 1e-8
   opttol  1e-8
   maxit   9999999
   

4. CONOPT 3.14S

   rtredg  1e-8
   rtnwma  1e-8
   

5. MINOS 5.51

   Row tolerance         1e-8
   Optimality tolerance  1e-8
   Superbasics limit     10000
   

6. SNOPT 7.2-4

   Major feasibility tolerance 1e-8
   Major optimality tolerance  1e-8
   Superbasics limit           5000
   

Timelimit: 3600 seconds
Relative optimality and feasibility tolerance: 1e-8

Platform:

• Intel Core 2 Duo CPU T7500, 2.2 GHz, 2 GB RAM
• Linux 2.6.22.18, SuSE Linux 10.3, 32 Bit
• gcc 4.2.1

Results