Comparing Asynchronous and Synchronous Parallelization of the SMS-EMOA

We experimentally compare synchronous and asynchronous parallelization of the SMS-EMOA. We find that asynchronous parallelization usually obtains a better speed-up and is more robust to fluctuations in the evaluation time of objective functions. Simultaneously, the solution quality of both methods only degrades slightly as against the sequential variant. We even consider it possible for the parallelization to improve the quality of the solution set on some multimodal problems.