[Ipopt] changing linear solver to ma86 which is not an the option list

jonathan.hogg at stfc.ac.uk jonathan.hogg at stfc.ac.uk
Sun Dec 20 07:53:08 EST 2015

This isn't terribly surprising - they should all give the same answer for solving the linear system!

The only time changing the linear solver might help reduce iteration count is if there is some form of breakdown (eg singular systems), where different solvers might offer different scaling techniques or similar that will determine if they can successfully extract meaningful information from the system.

Changing the linear system may, however, decrease time per iteration.

From: Ipopt [ipopt-bounces at coin-or.org] on behalf of 1252685 at tongji.edu.cn [1252685 at tongji.edu.cn]
Sent: 20 December 2015 11:18
To: ipopt at list.coin-or.org
Subject: [Ipopt] changing linear solver to ma86 which is not an the option      list

I'm solving some nolinear problem with ipopt,and trying to change the linear solver to improve its efficiency.

And I have tried mumps,ma27 and ma57 so far.But the outcome isn't really satisfying.The solving process with these three linear solvers have almost the same number of iteration steps.I wondering if I have change the linear solver successfully,but the program output says that "this is ipopt version 3.7 stable,runing with linear solver ma57",Can this guarantee that i have changed the linear solver from default mumps to ma57 successfully?if so,maybe i should change some other linear solvers like HSL_MA86? But the ipopt only have linear solver options like mumps,ma27,ma57.The ma86,ma77 are not in the option list.how can I change the linear solvers to another one like ma86?

Can you give me some instructions,or if there is any website or post discussing about it?I'm changing linear solver by dynamically loading some separate DLL. Working on windows,using msvs and intel fortran compiler.

Sorry for my poor English,and thanks in advance!
Best regards,

Dongming Jin
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Ipopt at list.coin-or.org

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