dtrnlspbc_solve solution outside the allowed range

[Gianluca_G_1]

We are using a Trust Region MKL API: dtrnlspbc_solve and related functions.
We use the optimization with constraints.
The objective function written by us worked properly for years, in your algorithm.
Untill a customer of us signalated a strange behaviour, this is, a valid solution outside the allowed range!

We observed that, moving a little bit the initial conditions, if works! why this can happen?
Any suggestions?

Thank you

Gianluca

[Pamela_H_Intel]

Gianluca,

I would like to try to reproduce this issue so that I can help find the cause. Could you please give me a simple program that shows this anomaly? And give me more details?

• What link/compile lines do you use? This should give me the following info:
  • Linux/Win/macOS
  • Which compiler
• Which MKL version?
• Which threading library, if any?

Pamela

[Gianluca_G_1]

Dear Pamela,

to prepare a demo it takes us some time because is all integrated in our software, that have a copyright.

By the way, I will see to create something.

We are integrating MKL in C# and we use VS2019. So we use dll already compiled.

MLK version is 2019.0.1.1

this is all.

PS. we found a partial solution in order to solve this bug, simply moving a little the initial values, after a wrong result.

BR

Gianluca

[Pamela_H_Intel]

Gianluca - what do you mean you use an already compiled dll?

MKL does not yet support VS 2019 - so this introduces an unknown. Is there any chance you can try your code on VS 2017?

[Gianluca_G_1]

I mean that we use API, from dll.

I've attached  pictures of this strange behaviour:

If you want a demo, I've created it, but I prefer send you in a private channel. 

BR

Gianluca

[Pamela_H_Intel]

Gianluca,

I am trying to figure out your environment.

"API from dll" - are you saying that someone in your company has constructed a dll with all the MKL functionality you need? so you are using a statically built MKL object file, and only linking that, in which case I would not be able to determine what you are linking from your link line.

I know that you are using MKL with Visual Studio.

• are you using the VS developer command prompt (see image) OR the full VS application
• if you are using the VS dev cmd prompt, please send me your compile and link lines (though as indicated above, if you are linking to a dll pre-built from MKL, this won't likely be helpful)
• if you are using the full application, it is a bit more difficult to tease out exactly which dlls you are linking to . . .

A demo would be great. You can send me anything privately by using the SendAuthorAMessage link at the top right of any of my posts:

[Pamela_H_Intel]

Gianluca - I just saw an older post of yours . . . where you say you had a current license for Parallel Studio. If you still do, and it's a paid license, you can submit a ticket to https://supporttickets.intel.com/servicecenter - that is our premier customer support channel.