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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';
load_system(model);
numSims = 10;
for i = 1:numSims
in(i) = Simulink.SimulationInput(model);
in(i) = in(i).setVariable('DX',my_data(:,i));
end
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.
  8 Comments
Fawad Farooq Ashraf
Fawad Farooq Ashraf on 15 Feb 2022
I found a link
After reading this, I think that parsim creates temporary directories for each of its workers and sends them the files listed in the model dependency analyzer. In the model dependency analyzer, my data files aren't listed there. Maybe that's the reason it's unable to read/load them.
I've tried to use SetupFcn and setPreSimFcn to copy files to the current working directory of each model but I can't seem to do it correctly. Do you know anything about it?
Gabriel Geiger
Gabriel Geiger on 29 May 2024 at 14:31
Edited: Gabriel Geiger on 29 May 2024 at 14:32
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?

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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.
  1 Comment
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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