<div>Hi all</div>
<div>I download the Windows binary for IpOpt. I didn't have enough time to compile from source or to download and compile not-included solvers. I have an AMPL model that, when I try to solve with IpOpt, it gives the following error. Any clues what is going on? I have 2 GB RAM on a Windows XP machine. I tried to fiddle with the alleged "mump_mem_percent option" but ipopt came back to me saying that was not a recognized option. Error dump follows:</div>
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<div>******************************************************************************<br>This program contains Ipopt, a library for large-scale nonlinear optimization.<br> Ipopt is released as open source code under the Common Public License (CPL).<br>
For more information visit <a href="http://projects.coin-or.org/Ipopt">http://projects.coin-or.org/Ipopt</a><br>******************************************************************************</div>
<div>NOTE: You are using Ipopt by default with the MUMPS linear solver.<br> Other linear solvers might be more efficient (see Ipopt documentation).</div>
<div><br>This is Ipopt version 3.8.0, running with linear solver mumps.</div>
<div>Number of nonzeros in equality constraint Jacobian...: 0<br>Number of nonzeros in inequality constraint Jacobian.: 30888<br>Number of nonzeros in Lagrangian Hessian.............: 617760</div>
<div>MUMPS returned INFO(1) =-13 - out or memory.<br>In some cases it helps to decrease the value of the option "mumps_mem_percent".<br>Total number of variables............................: 32175<br> variables with only lower bounds: 0<br>
variables with lower and upper bounds: 32175<br> variables with only upper bounds: 0<br>Total number of equality constraints.................: 0<br>Total number of inequality constraints...............: 936<br>
inequality constraints with only lower bounds: 0<br> inequality constraints with lower and upper bounds: 0<br> inequality constraints with only upper bounds: 936</div>
<div>iter objective inf_pr inf_du lg(mu) ||d|| lg(rg) alpha_du alpha_pr ls</div>
<div> 0 2.7042410e+002 0.00e+000 1.46e+001 -1.0 0.00e+000 - 0.00e+000 0.00e+00<br>0 0<br>MUMPS returned INFO(1) =-13 - out or memory.<br>In some cases it helps to decrease the value of the option "mumps_mem_percent".<br>
WARNING: Problem in step computation; switching to emergency mode.<br>Restoration phase is called at point that is almost feasible,<br> with constraint violation 0.000000e+000. Abort.</div>
<div>Number of Iterations....: 0</div>
<div> (scaled) (unscaled)<br>Objective...............: 2.7042410056253124e+002 2.7042410056253124e+002<br>Dual infeasibility......: 1.4603015700000002e+001 1.4603015700000002e+001<br>
Constraint violation....: 0.0000000000000000e+000 0.0000000000000000e+000<br>Complementarity.........: 9.9000001999999998e-001 9.9000001999999998e-001<br>Overall NLP error.......: 1.4603015700000002e+001 1.4603015700000002e+001</div>
<div><br>Number of objective function evaluations = 1<br>Number of objective gradient evaluations = 1<br>Number of equality constraint evaluations = 0<br>Number of inequality constraint evaluations = 1<br>
Number of equality constraint Jacobian evaluations = 0<br>Number of inequality constraint Jacobian evaluations = 1<br>Number of Lagrangian Hessian evaluations = 1<br>Total CPU secs in IPOPT (w/o function evaluations) = 0.828<br>
Total CPU secs in NLP function evaluations = 0.172</div>
<div>EXIT: Restoration Failed!</div>
<div>Ipopt 3.8.0: Restoration Phase Failed.</div>
<div>suffix ipopt_zU_out OUT;<br>suffix ipopt_zL_out OUT;<br>ampl:<br></div>
<div><br clear="all"><br>-- <br>Muhammad Saqib Ilyas<br>PhD Student, Computer Science and Engineering<br>Lahore University of Management Sciences<br></div>