In the initial chapter of this book, we mentioned that systems often need to be able to scale with the load exerted to them.

A system that scales up (vertically) with, for example, more memory and CPU cores in a single computer, has arguably several advantages. Upgrades of new hardware resources are almost always completely handled by the operating system and the JVM. Thus, administration, monitoring, and even applications will only need some to no alteration at all. Consequently, there is not much more to actually tune here, apart from what we've already discussed in previous chapters.