MATLAB: Issue with Simulink Model Simulation using CVSIM command inside Parfor

parallel computingParallel Computing ToolboxparforsimulinkSimulink Design Verifier

Hi,
I am trying to run multiple simulations with different data set on model 'ModelTest.slx' using parfor.
my code goes like this,
parfor
 ...
 ...
 testObj = cvtest(model);
 testObj.settings.decision = 1;
 testObj.settings.condition =1;
 tempData.data = cvsim(testObj); 
 ...
 ..
end
I am getting below error after execution
Caused by:
    Error using cvsim
    Transparency violation error.
Below are the details of matlab version and model settings,
Matalb 2015b,
parpool with local profile.
Simulation Mode : Normal;
Solver :Fixed Step, discrete
Does anyone have any idea about this error. ?
Or Is there any other way we can extract the coverage information without using "CV" functions. ?

Best Answer

Caveat: I know nothing about cvtest or cvsim. I suspect that cvsim is trying to inspect the calling workspace - this is not allowed inside parfor, and causes a "transparency violation". (This slightly cryptic term simply means that all accesses to variables must be "transparent" - i.e. obvious in the text of the program.)
Often, the simplest route is to pop the body of your parfor loop into a separate function, so you'd do:
parfor idx = ...
    out(idx) = myCvSim(idx,model)
end
...
function out = myCvSim(idx,model)
    testObj = cvtest(model);
    ...
    out = cvsim(testObj);
end
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