How does parallel computing toolbox works in nested loop?

Say pseudo code as following:

parfor ii = 1:2
    firtgp(X_, y, 'UseParallel', true);
end

Now assume 8 workers available, how are these 8 workers assigned to the task above?

Answer 1

[Raymond Norris]

MATLAB will run the inner parfor loop as a for-loop. Therefore, in your example, where you have a parallel pool of 8 workers, 2 will be used for the ii loop and the other 6 will stay idle. The parfor loop embedded within firtgp will run as a for-loop.

[mono]

Thanks. Is there a simple way I can make the fitrgp go parallel using other 6 workers?

[Raymond Norris]

No. You have to either choose the parallel for-loop on the outside (ii = 1:2) or the inside (firtgp).