MATLAB: How does parsim() run more instances than workstation cores

Parallel Computing Toolboxparsim

I want to run six simulink models in parallel using the parallel computing toolbox and parsim(). My workstation has 4 cores. The parallel computing toolbox creates no more workers than cores.
How does parsim() handle the six models in parallel when it can create no more than 4 workers? Threads?

Best Answer

Set NumWorkers as 6 in cluster profile manager. Go to
MATLAB Toolstrip (menu bar) 
-> Parallel 
-> Manage Cluster Profiles
-> Select your cluster 
   (if you are working on your machine, please select "local") 
-> Click Edit
-> Change/Set NumWorkers to 6 
   (In the image, NumWorkers is set as 4)
After setting NumWorkers as 6, run parsim again.
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