Why SimEvents spends so much time

Question

Gul Culhan 2020-9-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/601021-why-simevents-spends-so-much-time

回答： Krishna Akella 2020-12-1

I am trying to simulate a discrete event system using the simevents blocks. I created a dummy model which only includes an entity generator and an entitiy terminator blocks with stop time 365. I generate entities with matlab action;

persistent rngInit;
if isempty(rngInit)
    rng(iterSeed);
    %iterSeed is in model properties with iterSeed = randi(500);
    rngInit = true;
end
% Interarrival times: Exponential distribution
lambda = 1;
dt=-lambda*log(1-rand());

I ran 1000 replications with following code;

warning('off','all');
numSimulations = 1000;
mdl = 'DummyModel';
for i = 1:numSimulations
    out(i) = sim(mdl);
end
display('END');

Even this simple piece of code took 655 seconds. I also tried the accelerator mode but it worsened the total time to 1208 seconds. Why even a dummy SimEvents model spends so much time?

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Answer 1

Abdolkarim Mohammadi 2020-9-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/601021-why-simevents-spends-so-much-time#answer_501565

编辑：Abdolkarim Mohammadi 2020-9-28

在 MATLAB Online 中打开

You should run 1000 simulations using sim() in conjunction with SimulationInput objects. With SimulationInput you can define the variables for each experiment. You can also use the fast restart option for faster execution of models. Please test the following code.

numSimulations = 10;
Model = 'DummyModel';
SimIn = repmat (Simulink.SimulationInput(Model), [numSimulations,1]);
SimOut = sim (SimIn, 'UseFastRestart', 'on');

If you have Parallel Computing toolbox license, you can also try parsim().

SimOut = parsim (SimIn);

Please read the documentation:

https://www.mathworks.com/help/simulink/ug/introduction_bvnw33f.html