[Ipopt] performance on netlib lp test set

[Jonathan Hogg]

Hi,

I've been running ipopt on the netlib test set using the amplsolver 
interface.

This works, and gets correct answers, however the iteration count is on 
the high side (eg 25fv47 200 iterations). Is this the same experience 
other people have?

I'm told that most netlib problems should be solved by an interior point 
method in more like 20 iterations than 200.

Is this just because IPOPT is designed for NLP, or have I got something 
going wrong?

The .nl file for 25fv47 is available at the following url if anybody 
would like to give it a go:
http://www.maths.ed.ac.uk/~s0455378/25fv47.nl

Thanks,
Jonathan.