Island model

[txt2vz]

Would be nice if there was an easy way to implement an island model such that evolving sub-populations (possibly with different parameters) could exchange a small number of individuals after a set number of generations.

[jenetics]

Yes, that would be nice ;-) I already explored the island model myself. Although Jenetics has all building blocks to do this, it is not that easy to implement a general usable solution.
If you are interested, the main build block would be the Engine.stream​(Iterable<Genotype> genotypes) method, which allows to create a new EvolutionStream from a given initial population. Have you already tried to implement an island model? Would be nice if you can share your ideas/implementations.