I am performing an optimization, where in a Simulink Model (involving Matlab function blocks and discrete event blocks amongst other typical blocks) block parameters are changes by an optimization algorithm and the output of the simulation is used as the objective function value. Every time the optimization algorithm determines new design variable values the Simulink model gets the parameter values (using the set_param command), the simulation is started, run till the stop time is reached and then the end values are evaluated. After that, the iteration starts again. Therefore the simulink model is started many times (e.g. 3000 times). At the beginning, the startup and initialization of the model in every iteration takes just a split second, and the simulation itself about 5 seconds. The more often the model is evaluated the longer the initialization takes. After about 500 iterations, the initialization takes about 12 seconds and the simulation still 5 seconds. After 1000 iterations the initialization takes 22 seconds, and so on.
Did anyone encounter a similar problem and knows what the solution is to keep the initialization time low?
Thank you.
Dear Philipp,
Writing S-functions allow you to add your own algorithms to Simulink models and you can have an optimization loop gets slower?
Please take a look at attached file.
Best regards
You should try fast restart option. It speeds up model execution even more, when used in conjunction with parsim.
https://www.mathworks.com/help/simulink/ug/fast-restart-workflow.html
https://www.mathworks.com/help/simulink/slref/parsim.html
I have similar problems without Matlab function blocks and discrete event blocks (hence only typical Simulink blocks). Fast restart generally improves the startup time, but the problem remains. Simulations will slow down after more iterations.
Trank you Abdolkarim Mohammadi-Balani,
the fast restart option helped a lot, as the simulation model stays in the initialized state. There still is a increase in Start-up time on every iteration, but it is much lower
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