Hi Juan,<div><br></div><div>A bit more information could be helpful to better understand what the problem is. For example, what other options are you using (eg, for the barrier parameter update), how many iterations does IPOPT take on each of the cases you talk about, what linear solver do you use, are any of the variables at the bounds in the optimal point, is there any regularization being done at the solution (or iterates)??</div>
<div><br></div><div>Best,</div><div> Rodrigo<br><br><div class="gmail_quote">On Fri, Jul 1, 2011 at 11:04 AM, Juan Ignacio Laiglecia <span dir="ltr"><<a href="mailto:juanlaiglecia@hotmail.com">juanlaiglecia@hotmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div dir="ltr">
<span style="font-size:10pt" lang="EN-US">Dear All<u></u><u></u><u></u></span><br>
<span style="font-size:10pt" lang="EN-US"> <u></u><u></u></span><br>
<span style="font-size:10pt" lang="EN-US">I am running IPOPT with this warmstart options:<u></u><u></u></span><br>
<span style="font-size:10pt" lang="EN-US"><u></u> <u></u></span><br>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">warm_start_init_point yes<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">warm_start_bound_push 1e-6 <u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">warm_start_mult_bound_push 1e-6<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">I am trying to figure out why I cannot obtain better computational times after a third run.<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">For example, a problem of 42915 variables and 42615 constraints takes for:<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">1<sup>st</sup> run -> time = 23.7 min<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">2<sup>nd</sup> run -> time= 4.61 min<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><b><span lang="EN-US">3<sup>rd</sup> run -> time= 4.6 min<u></u><u></u></span></b></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">If I am giving to IPOPT the optimal solution, why the following run takes the same time as the second?<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">Thanks<u></u><u></u></span></p>
<p style="margin:0cm 0cm 0pt" class="MsoNormal"><span lang="EN-US">Juan<u></u><u></u></span></p>
<br> </div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br><span style="font-family:Arial, Helvetica, sans-serif;font-size:14.1667px;border-collapse:collapse;color:rgb(51, 51, 51)"><img src="http://www.cs.cmu.edu/~aml/logos/wordmark.jpg" width="200" height="24"><br>
<strong><span><font color="#000000"><span style="background-color:rgb(255, 255, 255)">Rodrigo</span></font></span><font color="#000000"><span style="background-color:rgb(255, 255, 255)"> López-</span></font><span><font color="#000000"><span style="background-color:rgb(255, 255, 255)">Negrete</span></font></span><font color="#000000"><span style="background-color:rgb(255, 255, 255)"> de la Fuente</span></font></strong><font color="#000000"><span style="background-color:rgb(255, 255, 255)"><br>
</span></font>Doctoral Candidate <br>Email: <a href="mailto:rln@cmu.edu" style="color:rgb(7, 77, 143)" target="_blank"><span>rln@cmu.edu</span></a><div><span style="color:rgb(34, 34, 34)"><span style="background-color:rgb(255, 255, 255)">WWW</span></span><span style="background-color:rgb(255, 255, 255)">: <a href="http://rodrigo.lopez-negrete.org" target="_blank">http://rodrigo.lopez-negrete.org</a></span><span style="background-color:rgb(255, 255, 255)"><br>
</span><br>Department of Chemical Engineering<br>Carnegie Mellon University <br>5000 Forbes Ave. <br>Pittsburgh, PA 15213-3890<br>USA</div></span><br>
</div>