Extremely slow compilation time in referenced model (Simulink)

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]

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

[maiaL]

It's been happening here for a couple versions already (2018 and on). I haven't found a solution to this yet

[Charles Collins]

So few blocks support code generation. I have the same problem and have been dealing with insane compile times for quite some time now. I am not sure what could possibly make some of the blocks so terribly slow to compile.

[Eugene Ofori]

Hi I'm running into the exact same issue were you able to improve the compilaiton time. My reference model takes a minute to compile when I run sldiagnostics but 5mins when I compile the parent model.

[Mark Hiteshew]

I have this same issue. I have a lot of model references and it takes a while to 'update' them before starting to run the model, even if I haven't changed anything in the model references. It's rather annoying

Answer 1

[Jesús Zambrano]

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.

[maiaL]

Thanks. Going to try those and report back.

[maiaL]

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.

[Jesús Zambrano]

Then please check the following link regarding consideration for S-functions:

https://www.mathworks.com/help/simulink/ug/designing-your-model-for-effective-acceleration.html