Simulink coder for Veristand

Hello.

I created a model in Simulink using veristand model generation support. This model are calculated in real-time on host machine with Linux. Everything is ok. But I see that only one CPU is loaded. What is the problem can be and how can I fix it? I see the settings were I can choose the processor number for calculation (see the attachment), but it’s only one processor. How can I use several processors for calculation one model? Can the problem is in code which doesn't allow to calculate on several processor simultaneously? Thank you.