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Extremely slow compilation time in referenced model (Simulink)

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Leonardo Maia
Leonardo Maia on 29 Jul 2020
Commented: Jesús Zambrano on 9 Sep 2020
I have a Simulink model (model1) which has a model reference to model2.
Model2 compilation time (checked with sldiagnostics) is pretty fast, takes 10s or so. However, when I compile model1, the compilation times takes more than 3 minutes, and according to sldiagnostics, the only step that's taking too long is exactly this:
Cstat28: 190.56 seconds -- Check And Compile Model Reference Normal Modes
which is the compilation of the referenced model (model2).
How's this possible? What could I do to alleviate this, as a 3-minute compilation time is a huge hindrance for my test environment.


Niklas Högemann
Niklas Högemann on 21 Aug 2020
I guess i have the same problem. There are 10 referenced subsystems on my Top Level Model. Compiling the model takes round about 3 minutes, sldiagnostics shows 120 seconds for "Check and Compile Model Reference Normal Modes". If i updating the diagram by ctrl-d it takes the same time. Im not sure but i mean the problem occurs suddenly, maybe it is caused by a update or something ? I dont know.
Do you already found a solution for this issue ?
Best regards
Leonardo Maia
Leonardo Maia on 31 Aug 2020
It's been happening here for a couple versions already (2018 and on). I haven't found a solution to this yet

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Answers (1)

Jesús Zambrano
Jesús Zambrano on 8 Sep 2020
Try running the top-level model in Accelerator or Rapid Accelerator mode.
Here are a few tips when using the Accelerator and Rapid Accelerator mode:
  • Avoid blocks that do not support code generation. They run in interpreted mode and can slowdown your model.
  • Try switching the Compiler Optimization Level from faster build to faster run.
  • For maximum speed, start your simulation using the sim command when using these modes.


Leonardo Maia
Leonardo Maia on 9 Sep 2020
Didn't work. I have some S-functions coming from C++ code in the model and I'm getting some strange build errors in Accelerator mode.

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