[Ipopt] solving maxflow as LP

[Tamas Vinko]

Hello,

it seems that using IPOPT with the MA57 solver speeds the whole thing
up. Now, I can solve this maxflow problem instance within 2 hours,
which is a huge improvement.

Could you please suggest IPOPT options which can even more speed up
the search? This is a linear programming problem, I guess there might
be some options for "switching off the nonlinear part" of the
solver...

Thanks again,
Tamas.