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<DIV>Non-repeatability is usually due to parallel BLAS, or occasionally a memory
allocation bug (several of which may have been fixed since 3.9.1).</DIV>
<DIV> </DIV>
<DIV>For Anil, does this still happen if you set the linear_solver option to
‘mumps’? On Mac, I think my most recent mex files were using the Apple vecLib
BLAS libraries, which I believe are parallel and based on MKL. There might be a
way to force vecLib to run single-threaded, but I’m not sure how. You could also
build mex files using the netlib BLAS (I think I have a few of those around,
though IIRC your problems would occasionally run into exception-handling issues
on Mac with those mex files).</DIV>
<DIV> </DIV>
<DIV>For Jochen, what version of BLAS were you using? How are you calling Ipopt,
through which interface or via a standalone application, etc?</DIV>
<DIV> </DIV>
<DIV>Try setting output_file and a high value for file_print_level to see
exactly where two runs start diverging, and verify that all the initial data is
exactly the same like you think it should be.</DIV>
<DIV> </DIV>
<DIV>-Tony</DIV>
<DIV> </DIV>
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<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title=Jochen.Steimel@bci.tu-dortmund.de
href="mailto:Jochen.Steimel@bci.tu-dortmund.de">Steimel, Jochen</A> </DIV>
<DIV><B>Sent:</B> Friday, September 13, 2013 7:40 AM</DIV>
<DIV><B>To:</B> <A title=ipopt@list.coin-or.org
href="mailto:ipopt@list.coin-or.org">ipopt@list.coin-or.org</A> </DIV>
<DIV><B>Subject:</B> Re: [Ipopt] Ipopt Stochasticity</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d">Dear
all,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d">i
have encountered a similar problem as Mr. Rao. Even if I call IPOPT in direct
succession with no changes in options or starting points the result might vary,
ranging from SOLVE_SUCCEEDED to RESTORATION_FAILED. Does anybody have an idea
what might cause this behavior? I am using IPOPT 3.9.1 with linear solver MA57
on a Windows Machine with a Intel Core 2-Duo processor. I only encounter this
problem in difficult optimizations. If the problem is trivial, it always
converges.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d">Regards<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d">Jochen<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<DIV>
<DIV
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<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Von:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
ipopt-bounces@list.coin-or.org [mailto:ipopt-bounces@list.coin-or.org] <B>Im
Auftrag von </B>Anil Rao<BR><B>Gesendet:</B> Freitag, 13. September 2013
14:39<BR><B>An:</B> ipopt@list.coin-or.org<BR><B>Betreff:</B> [Ipopt] Ipopt
Stochasticity<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p></o:p> </P>
<DIV>
<DIV>
<P class=MsoNormal>All<BR><BR>I have a problem that I have set up using the
latest precompiled Matlab mex files (those that Tony Kelman graciously
provided). I am having an issue that Ipopt runs a different number of iterations
each time the problem is solved. I change nothing between calls to Ipopt, I
simply solve the exact same problem repeatedly with the same initial guess. Does
anyone have a reason why I may be having the aforementioned issue of
non-repeatability?<BR><BR>Anil Rao<o:p></o:p></P>
<DIV>
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<P class=MsoNormal><BR clear=all><BR>-- <BR>Anil V. Rao<BR>Associate
Professor<BR>Department of Mechanical and Aerospace Engineering<BR>University of
Florida<BR>Gainesville, FL 32611-6250<BR>Tel: (352)
672-1529<BR>E-mail: <A href="mailto:anilvrao@gmail.com"
target=_blank>anilvrao@gmail.com</A><o:p></o:p></P></DIV></DIV></DIV>
<P>
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