[Ipopt] ampl options elapsed time

Andreas Waechter andreasw at watson.ibm.com
Wed Dec 1 09:01:14 EST 2010

Hi David,

The link on the NEOS page for the Ipopt options is outdated, it refers to 
the Ipopt options available in the old Fortran version (the current 
version is a C++ implementation).  Thanks for pointing this out.

I just created a page on the Ipopt wiki to list all available options in 
the new version, here is the link:


Note that some options refer to linear solvers that might not be available 
in the version of Ipopt in installed on NEOS, such as ma27, ma57, and 
wsmp.  They will not work then.

I will contact the maintainer of the Ipopt NEOS website and try to correct 
this soon.



On Wed, 1 Dec 2010, David Gravot wrote:

> Hello
> I'm using IPOPT through NEOS server. Whenever I include a command file, it
> seems that ipopt options are not recognized
> I receive such errors :
> Ipopt 3.8.3: Unknown keyword "imaxiter"
> Unknown keyword "dtol"
> Yet, I'm using options exactly as mentioned on the URL :
> http://www.coin-or.org/Ipopt/IPOPT_options.html
> Besides, is there an option to display the resolution time ?  "ioutput" with
> an appropriate level ?
> Thanks
> David
> _______________________________________________
> Ipopt mailing list
> Ipopt at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/ipopt

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