Summary

In this lesson, we have discussed the ways to improve Java application performance by using multithreading. We described how to decrease an overhead of creating the threads using thread pools and various types of such pools suited for different processing requirements. We also brought up the considerations used for selecting the pool size and how to synchronize threads so that they do not interfere with each other and yield the best performance results. We pointed out that every decision on the performance improvements has to be made and tested through direct monitoring of the application, and we discussed the possible options for such monitoring programmatically and using various external tools. The final step, the JVM tuning, can be done via Java tool flags that we listed and commented in the corresponding section. Yet more gains in Java application performance might be achieved by adopting the concept of reactive programming, which we presented as the strong contender among most...