<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Hi Rodrigo,<DIV>I had never seen this before. Do you get it only with Bonmin or also with Ipopt?</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Best,</DIV><DIV>Pierre<BR><DIV><DIV>On May 6, 2007, at 12:32 AM, Rodrigo López Negrete de la Fuente wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite">Hi all,<BR><BR>I've been noticing that, sometimes, ipopt returns negative time values when using bonmin. I'm not sure where the error could be, but for example I sometimes get:<BR><BR>[ sniped output ...]<BR>Number of Lagrangian Hessian evaluations = 135 <BR>Total CPU secs in IPOPT (w/o function evaluations) = -267.789<BR>Total CPU secs in NLP function evaluations = 548.166<BR><BR>EXIT: Optimal Solution Found.<BR>IpOp0006I Ipopt return (for resolve): status 0, iter count 135, time 280.378<BR>IpOp0009I 3 OPT 3095.02 135 280.378<BR><BR>I wish to properly report the time that the solver took, but I'm not sure if I should add the absolute values or if there really is a problem in the timing functions. Has anybody else seen this type of behavior? Any ideas? <BR><BR>Thanks,<BR> Rodrigo<BR><BR clear="all"><BR>-- <BR>Rodrigo López Negrete<BR><A href="http://muon.blogdns.org/~rush/">http://muon.blogdns.org/~rush/</A><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Bonmin mailing list</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="mailto:Bonmin@list.coin-or.org">Bonmin@list.coin-or.org</A></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><A href="http://list.coin-or.org/mailman/listinfo/bonmin">http://list.coin-or.org/mailman/listinfo/bonmin</A></DIV> </BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>