Parametric sweep in OpenModelica using OMPython

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I am trying to run a parametric sweep in OpenModelica using OMPython. Let's assume that I have a Modelica model my_model.mo belonging to the library my_library. The model has two parameters: a and b. I successfully managed to run a single parametric run by using the following code:

from OMPython import OMCSessionZMQ
omc = OMCSessionZMQ()
omc.sendExpression('loadModel(my_library)')
omc.sendExpression('simulate(my_library.my_model, simflags="-overrideFile=parameter_sweep.txt", stopTime=86400)')

where the file parameter_sweep.txt is:

a=5
b=6

Now the question is: how can I run multiple parametric runs? I could add one more line to the code where a new txt file (parameter_sweep1.txt) with a new set of values for the parameters is used:

from OMPython import OMCSessionZMQ
omc = OMCSessionZMQ()
omc.sendExpression('loadModel(my_library)')
omc.sendExpression('simulate(my_library.my_model, simflags="-overrideFile=parameter_sweep.txt", stopTime=86400)')
omc.sendExpression('simulate(my_library.my_model, simflags="-overrideFile=parameter_sweep1.txt", stopTime=86400)')

However, I am afraid that in this way there is the need to recompile. Is there a way to do multiple parametric runs and avoid re-compilation?

openmodelica modelica python
1 Answers

Use the buildModel command instead of simulate Then start the process manually in Python using a library such as subprocess. The command is simply something like:

["./my_library.my_model", "-overrideFile=parameter_sweep.txt"]

(If you use Windows, I believe you need to update your PATH environment variable as well, in order to find the used DLLs. If you use Linux, it just works.)

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