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Using parsim with SIMULINK model containing c-mex s-functions

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I have a simulation with multiple S-functions (level 2 written in c++). I want to run a Monte-Carlo analysis for my problem and to speed up the process, I want to run the simulations in parallel using the parsim command. There's a parameter for the S-functions "DX" which would be different for every simulation.
model = 'my_model';
numSims = 10;
for i = 1:numSims
in(i) = Simulink.SimulationInput(model);
in(i) = in(i).setVariable('DX',my_data(:,i));
simOut = parsim(in);
According to my understanding, this should work but it gives me errors.
My c++ S-functions is supposed to load and read some DAT files in order to run and they are in a different folder. The path to access the files is written inside the code. I have added an exception in the code that it should give error "Data could not be loaded" in case the code fails to load and read the files. I get this error when I try to run the simulation using "parsim" command. However, it works fine using the "sim" command.
What could I be doing wrong here? Am I missing something? Any help would be highly appreciated.
Gabriel Geiger
Gabriel Geiger on 29 May 2024
Edited: Gabriel Geiger on 29 May 2024
Following up on this threat to see if OP has found anything on this topic. I'm running into a nearly identical issue. I've added the search paths to the parallel workers for the files the S-function tries to refer to, and no luck. I've also tried to use addAttachedFiles() to the parallel pool to add the files needed, but this also does not work. Any updates?
Chintan on 19 Jul 2024 at 18:12
@Fawad Farooq Ashraf: we are facing a similar issue with using an FMU with dependencies in the parsim context. Were you able to resolve this issue?

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Answers (1)

Benjamin Thompson
Benjamin Thompson on 14 Feb 2022
Alternatively, you can read data from a binary file using fopen and fread in an M file in MATLAB. Read each dataset into the MATLAB workspace and use a Simulink foreach subsystem to pass data to the sin function in Simulink.
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Fawad Farooq Ashraf
Fawad Farooq Ashraf on 14 Feb 2022
Like I mentioned that my actual simulation consists of a lot of files and doing this would be cumbersome. I do not want to change my validated code which is working perfectly with the sim command.

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