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matlabcpusimulink

Simulink running on multiple cores (or not) for a given model

I have a huge simulink model that takes about ~1 hour to execute. In my computer (HP Z210), the execution makes the computer use all cpu cores at 100%. What is intriguing me is that the same model running on my colleague computer (Dell precision T3600) uses ~50% of the cpu "power" (some cores at 100% and some cores remain idle).

My questions is:

  1. I always thought Simulink runs in a single core. I´m not using parrallel computer toolbox or any other toolbox. I´m only using Matlab and Simulink licenses.
  2. Why the execution in my computer is different from my colleague? Does it have anything to do with hyper-threading?
Solution

  • While simulink itself is single threaded in executing a single model, a block itself might be multi threaded. For example a simulink block executing matrix multiplication will use the multi threaded implementation which is also used by matlab.