Why does my Simulink model take so long to run?

I am working with a large but new-to-me Simulink model in MatLab 2017A. This model takes over 26 minutes to run, which makes it very difficult to work with. I turned on the model profiler (set_param( model_name, 'Profile', 'on') before running it, and got a profile report starting with...

It is telling me that virtually all of the time is in the "compileAndLinkPhase", which makes sense with the text I see on the status bar as it runs, but it doesn't break it down any farther. Is there any setting or tool I could use to determine why this phase takes so long? Perhaps getting a specific part of the model takes too much time to compile, or a specific link takes too much time to process? Anything that tells me what it is about the model which takes so long to compile and/or link may be helpful.

Answer 1

[Sara Nadeau]

Hi Jeremy!

Sounds like accelerator mode could help you. You can find details about Accelerator mode in the documentation.

This is the landing page for learning about Acceleration: https://www.mathworks.com/help/simulink/acceleration.html

And here's a topic to get you started: https://www.mathworks.com/help/simulink/ug/what-is-acceleration.html

I hope this helps!

[Sara Nadeau]

Additionally, more to the point of your question, I hope this list of factors that affect performance can help you identify model changes that might decrease the simulation time: https://www.mathworks.com/help/simulink/ug/speed-up-simulation.html

And there's also Fast Restart which only performs the compile stage on the first simulation you run! https://www.mathworks.com/help/simulink/ug/fast-restart-workflow.html

Answer 2

[Kazem]

You can use excludedModels option to exclude some reference blocks for big project.

testObj.modelRefSettings.excludedModels = ["A","B","C","D" .."Z"];