Investigate whether checkpointing will be supported in future releases of OpenModelica

[uekerman]

No description provided.

[LeonardWilleke]

The OpenModelica Editor is the most convenient way to create Modelica models (.mo). It has an interface with drag-and-drop elements to simulate many engineering aspects. It can export the .mo models as FMU models as well, but not with the rollback functionality we need for implicit coupling.

This feature was not supported by the OpenModelica Editor or other tools in the OM ecosystem as of 2017: https://openmodelica.org/forum/default-topic/2276-how-to-set-parameters-in-an-exported-fmu.html

There was a recent push to integrate the export of FMUs with canGetAndSetFMUstate=true in the OpenModelica Compiler: OpenModelica/OpenModelica#8638

This is still experimental and not part of the standard function of the OM Compiler. I am not sure how the OM Compiler and the OM Editor work together, but my guess is that the OM Editor calls the OM Compiler to build FMUs. So it might be some way to go until OM Editor can export rollback FMUs.

TODO:

• Try to export a rollback FMU with OM Compiler
• Test capabilities of rollback FMU
• Ask developers if they plan to include it in OM Editor

[LeonardWilleke]

How to export a rollback FMU with OM Compiler:

Create script export-fmu.mos to load and build the model:

loadFile("MyModel.mo");getErrorString();
translateModelFMU(MyModel, fmuType="cs");getErrorString(); 

Execute the script with the OM Compiler and set the experimental flag:

omc --debug="fmuExperimental" export-fmu.mos

This creates a CS FMU with canGetAndSetFMUstate=true