What are ReservedCodeCacheSize and InitialCodeCacheSize?

Question

Can someone please explain what the JVM option ReservedCodeCacheSize and InitialCodeCacheSize are? Specifically when/why would I want to change it?

Answer 1

A good learning experience from Indeed engineering team and challenges they faced when migrating to jdk 8.

http://engineering.indeedblog.com/blog/2016/09/job-search-web-app-java-8-migration/

Conclusion : Jdk 8 needs more code cache han JDK 7

The default codecache size for JRE 8 is about 250MB, about five times larger than the 48MB default for JRE 7. Our experience is that JRE 8 needs that extra codecache. We have switched about ten services to JRE 8 so far, and all of them use about four times more codecache than before.