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Simulink code seems not to use pc's proccessing power.

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I am working on " Spiral Galaxy Formation Simulation " example in Mathworks. I changed some numbers and equations (attached file).
I supposedly bought an expensive laptop so I could increase the number of particles. But I was surprised to see that even with high number of particles the CPU was at less than 20% in use, while none of the other stats was restraining the speed. The screen capture is indicating.

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John D'Errico
John D'Errico on 7 Feb 2018
Edited: John D'Errico on 7 Feb 2018
That seems to indicate you are only using one core.
First, I might check
Then you might take a read here:

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