multicore tool2

 * <https://docs.oracle.com/javase/7/docs/api/index.html?java/util/concurrent/package-summary.html>
 * <https://medium.com/bpxl-craft/using-multi-core-processors-wisely-4536fdd93d00>
 * <https://christopher-batey.medium.com/cpu-considerations-for-java-applications-running-in-docker-and-kubernetes-7925865235b7>