Are Simulink buses performance effective?

2017 4 26
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更新时间：2017 4 27
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I have a Simulink program that uses structs, or buses as they are called in Simulink. The Simulink program contains a Matlab function and it's convenient to use structs in that function. The Simulink program uses several buses and some of them are inherited or propagated through in a hierarchy.
Are they any effective, performance-wise? Is it better to store a struct variable in a bus object and call the variable compared to create the variable within the Matlab code?

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Marcus Jansson
Marcus Jansson 2017-4-27

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When I asked the question I didn't know a way to investigate the performance of a Matlab function within a compiled Simulink program. Unfortunately Profiler cannot be used. Though, it was found that "tic toc" can be used.
Made a rough performance analysis, it seems that the structs/buses have some overhead. In my code it's for example 25% faster to call a subfunction that creates a 6x6 matrix from a 6x1 vector each timestep instead of creating it once the first timestep and store it in a bus and just retrieve it each timestep. Heavier operations like matrix inverse or backslash are though better to do once and store the result in a bus.
Consequently, do not rely on buses for optimum performance.

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KL
KL 2017-4-26

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Performance-wise I have never really observed any difference. For one thing, usage of structs/buses makes life easier and especially with simulink when you have too many signals, it makes the disgram look pretty neat and also easier when you use a single scope for multiple variables.

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