How to increase performance of variant subsystems?

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Lucas Maiß
Lucas Maiß 2017-11-29
评论： Tianhe 2025-5-13
Hello, I got a model based on variant subsystems. I got one extremely big variant subsystem, so the model crashes during compiling. When I insert needed subsystems by hand and delete the rest it works fine. So my question is, is there a methed how to increase the performance of variant subsystems, or an alternative ?
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Tianhe
Tianhe 2025-5-13
Hello Lucas,
I also encountered the same problem. MATLAB sometimes crashes when generating code (Ctrl+B) and sometimes crashes even when I only copy a subsystem in the variant subsystem module. I also think that my variant subsystem is a bit complex. Do you have any further progress about this issue? New version may not helps. My MATLAB is 2024b.

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Dinesh
Dinesh 2024-7-3
Hi Lucas.
Over the years, there have been many improvements and new features added in "Variant Subsystem". I don't think you would face any performance issue if you use the latest MATLAB release. As of version R2024a (latest release), by default, when you add "Variant Subsystem" to the Simulink canvas, the setting is in such a way that only the active choice is compiled. Inactive choices including commented subsystems are ignored and will not be compiled.
However, you can change this behavior by modifying the "Variant Activation Time" field to a value other than "update diagram" which would compile all the choices. Only this change might affect the performance, otherwise you shouldn't see any.
Here's the latest documentation link for "Variant Subsystem": https://www.mathworks.com/help/simulink/slref/variantsubsystemvariantmodelvariantassemblysubsystem.html

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