Genetic Algorithm parallel computing, why numlabs is still equal to one?

Hi all,

I'm implementing a code in which I need to use parallel computing.

For some parts of the code I can use "parfor" and "spmd" regions, but when I start using genetic algoritm (ga) some problems come out.

I set "UseParallel',true" or "UseParallel','always'" in the optimoptions and still the number of workers implied is one.

I can see this from the numlabs or the labindex variables.

Moreover, the time spent with parallel computing on is equal or greater than the not parallelized code, so I don't understand what's happening inside.

[Tianshu Bao]

I have the same issue