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<DIV>Evidently Mumps is not thread-safe (<A
style='href: "https://listes.ens-lyon.fr/sympa/arc/mumps-users/2013-11/msg00005.html"'><FONT
color=#0066cc>https://listes.ens-lyon.fr/sympa/arc/mumps-users/2013-11/msg00005.html</FONT></A>),
so yes if you can’t get an academic license for MA57 or newer (or Intel MKL
which has an implementation of Pardiso that Ipopt can now use), then it looks
like MA27 is the simplest option.</DIV>
<DIV> </DIV>
<DIV>-Tony</DIV>
<DIV> </DIV>
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style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=nicolas.derhy@gdfsuez.com
href="mailto:nicolas.derhy@gdfsuez.com">nicolas.derhy@gdfsuez.com</A> </DIV>
<DIV><B>Sent:</B> Tuesday, December 17, 2013 1:25 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> [Ipopt] executing parallel solve with no shared
object</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<P class=MsoNormal>Hi everybody,<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal><SPAN lang=EN-US>I am using IPOPT in a native C++ application
(using the C++ API) where I want to make parallel solves of independent
problems.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>Since there is no object share, I thought
that it would be possible after I read the changelog of IPOPT 3.11 :
<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style='FONT-SIZE: 10pt; FONT-FAMILY: "Courier New"'>
localized global variables in TaggedObject and
RegisteredOption,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style='FONT-SIZE: 10pt; FONT-FAMILY: "Courier New"'>
so that Ipopt should now be threadsafe as long as Ipopt
objects<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style='FONT-SIZE: 10pt; FONT-FAMILY: "Courier New"'>
(esp. SmartPtr's) are not shared between threads and a
threadsafe<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style='FONT-SIZE: 10pt; FONT-FAMILY: "Courier New"'>
linear solver is used (e.g., MA27) [#167]<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>But it does not work probably because I am
using the default linear solver (MUMPS I suppose). <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>I look for another linear solver here <A
href="http://www.coin-or.org/Ipopt/documentation/node13.html">http://www.coin-or.org/Ipopt/documentation/node13.html</A>
and I came to the conclusion that the only free solver allowing parallel solve
is MA27. <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US>Is this true or am I missing something
?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US>Best regards,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US>Nicolas<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p></o:p></SPAN> </P></DIV>
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