Multiple Simulink runs only changing signal vector

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Martin Ryba
Martin Ryba 2023-9-20
编辑： Murali Yeddanapudi 2023-9-27
I'm much more practiced at MATLAB than Simulink, but this problem has stumped me on a few models. I do signal processing and am using Simulink->HDL Coder so doing more in Simulink. I want to sometimes run "Monte Carlo" runs of a model with randomized signal streams to for instance calculate Probability of Detection. However, I've tried From Workspace blocks and Signal From Workspace and any time you simply rebuild the signal vector it triggers a model recompile. I want to be able to have a simple iteratative loop (and ability to parfor would be nice) that builds the signal, calls sim() (preferably in 'rapid' mode) and then parses the output, without recompiling every time. Is Binary File Reader the only viable option? The parsim() documentation talks about establishing Configuration Sets but that seems very confusing and I'm not sure it avoids the problem. Examples that have solved this would be most helpful.

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Murali Yeddanapudi
Murali Yeddanapudi 2023-9-26
Hi Martin:
Bharath brought your quesiton to my attention.
Firstly you are correct that changing the From Workspace variable causes the rapid-accelerator target rebuilt. We plan to fix this in a future release so that it does not rebuild and works as you expect with RapidAcceleratorUpToDateCheck off.
In the latest release, R2023b, using the root-level input port to feed the input sequence can avoid rebuild. I have attached a modified version of the example (that Bharath linked above) to demo this approach.
Best Regarfs
Murali
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Murali Yeddanapudi
Murali Yeddanapudi 2023-9-27
编辑：Murali Yeddanapudi 2023-9-27
Changing a Constant block's value from run-to-run should not trigger a rebuild. If you can send us reproduction steps (with the necessary files), I can look into it.
The wall clock execution time in accelerator (or rapid accelerator) mode can be longer in some cases, if the computational content of the model is dominated by precompiled/optimized blocks implemented a C-Mex S-Functions. Not sure if this applies in your case, if you can send an example, we can dig into it and see if we can speed up the accelerator modes.
Martin Ryba
Martin Ryba 2023-9-27
Thanks Murali, when I built a simpler model using that same sample writer and constant block you're correct it didn't force a recompile. I'm getting a fairly generic "Generated code was out of date." reason. Running through the checksum process, I finally located the culprit: my test sample generator was inadvertently generating a buffer that changed length each interation (a variable delay at the front to test Time of Arrival computation). When I forced it to fixed length, that cleared it up. Thanks!

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Bharath Venkataraman
This example shows how to accelerate BER measurements for HDL LTE Turbo Decoder model with data from MATLAB feeding a Simulink model. Does this help?
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Bharath Venkataraman
Bharath Venkataraman 2023-9-24
I will check with some of the Simulink folks to see what the best approach is. One thing you could try is to put most of the model into another model and use model reference. That may reduce the time for the model compilation since the top level model will be pretty simple (assuming the model reference will need no compilation).
Martin Ryba
Martin Ryba 2023-9-24
Yes, we already do that. The "test bench" model is pretty much just stimulus and data recording; the core is incorporated by reference and is what is set up to be converted by HDL Coder. I tried to see if Root Level Input ports provide a good mechanism, but that doesn't seem to be well configured for simulation input vectors/buffers. The incorporation of flow control is, I understand, an extra wrinkle (what makes defining them as timeseries/timetables a problem) but one that needs to be thought through as a normal use case.

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