ModelExecutionException: Timeout

Description

When i run a simulation model that takes more than 10 s, an exception TimeoutExpired is raised. I guess the initial definition in ModelicaSystem.ModelExecutionCmd.timeout is not updated by simargs={"alarm": 120}. I haven't found a solution to change the value of timeout besides overwriting the init value.

Steps to Reproduce

You can run the example.py file in the zip-archive, which will run a thermal building model created by the TEASER workflow. To run it you will need to install modelica library AixLib. The model should take longer than 10 s to calculate.

Example.zip

Expected Behavior

When i specify a flag like --alarm=120, i expect the timeout value to be raised accordingly.

Screenshots

Version and OS

Python Version: 3.12.3
OMPython Version: dev 5b05821
OpenModelica Version: 1.26.3~1-g7583224
OS: Linux Ubuntu 24.04.4 LTS

Additional Context

I also had trouble using the simulate(simargs={"override": {"stopTime": 63072000.0}}) feature. It did not raise an error but it also didn't change the time values in the result file, so it seems to be ignored. I don't know if the issues are related or if i made a mistake, since you've recently been working on the override feature (there is a typo in

OMPython/OMPython/ModelicaSystem.py

Line 1345 in 5b05821

    
                       mod.simulate(simargs={"noEventEmit": None, "noRestart": None, "override": "override": {"e": 0.3, "g": 10}})

).

OMC and OMPython use different timeouts - one within OMC and the other by Python using subprocess to call OMC

You should be able to modify the Python timeout as follows (main branch):

    omcs = OMPython.OMCSessionLocal(timeout=120.0)
    mod = OMPython.ModelicaSystemOMC(
        session=omcs,
    )

or using v4.0.1:

    omc = OMPython.OMCProcessLocal(timeout=120.0)
    mod = OMPython.ModelicaSystem(
         omc_process=omc,
    )

Untested - please check and provide feedback!

stopTime is tested in test_ModelicaSystem.test_getters() and other unittests

I have tested:

import OMPython
from pathlib import Path

directory = Path(__file__).resolve().parent
print(directory)
omcs = OMPython.OMCSessionLocal(timeout=300.0)
om = OMPython.ModelicaSystem(
    work_directory=str(directory / "project_0"),
    command_line_options=["-n=1"],
    session=omcs
)

om.model(
    model_file=directory / "project_0" / "package.mo",
    model_name="project_0.DESN_59630.DESN_59630"
)
sim_options = {"startTime": 0.0, "stopTime": 63072000.0, "stepSize": 3600.0}
om.setSimulationOptions(**sim_options)

om.simulate(simargs={"noEventEmit": None, "alarm": 120})

but the problem still remains with the same exception (timed out after 10.0 seconds).

but the problem still remains with the same exception (timed out after 10.0 seconds).

Quite right - you found a bug - the timeout value is not propagated down to the point there the model executable is called; I will prepare a bug fix

@psatke

@psatke please test PR #463

Thank you for the fix. Now i can set the timeout with:

    omcs = OMPython.OMCSessionLocal(timeout=120.0)
    mod = OMPython.ModelicaSystemOMC(
        session=omcs,
    )

and the simulation runs successfully.

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ModelExecutionException: Timeout #460

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ModelExecutionException: Timeout #460

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syntron commented on Apr 21, 2026

syntron commented on Apr 21, 2026

psatke commented on Apr 23, 2026

syntron commented on Apr 23, 2026

syntron commented on Apr 23, 2026

psatke commented on Apr 24, 2026

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