flamegraph

Over the past few months i got the opportunity to run an enterprise JVM webapp in production. A Weekly deployment schedule made tackling production performance issues and outages  challenging as CD wasn’t an option. I needed to find ways to debug a production instance without taking it down, or making any code changes.

Java Performance: The Definitive Guide has been tremendously valuable in helping me understand how JVM works. In this post I’d like to list few tools and techniques i learned from the book, as well as few scripts i wrote in the process.