A Visual Introduction to Inner-Workings of the JVM - Douglas Hawkins

Java developers are often exposed to the inner-workings of JVM's garbage collectors, and there are a host of tools that help monitor garbage collector activity.
But less often seen are the inner machinations of just-in-time compilation and deoptimization -- and how those machinations impact application performance.
In this talk, we'll learn how to read some of the JVMs mysterious log files, explore tools for visualizing the information, and most importantly correlate the JVM activity with application performance behavior.

[@kolawoleagoro6893]

The application possibilities you mentioned....ON POINT!! Very good part of the video

[@150metri]

so many mean comments on his hair style, but this guy is really awesome!

[@ashuzguitar]

Very cool stuff. I didn't know exchanges and banks considered 200 ms outage!!

[@dajuanmcdonald3861]

seeing the typo in endNanos as endNaos makes me wonder how the code still worked for the logs given the error should happen at compile time.

[@richardwang3438]

didn't know Bjarne Stroustrup could write Java

[@ChristopherGray00]

the worst thing about that hair is its a choice, he chose to have that hair, who on earth would choose that hair? being bald is a thousand times better than that monstrosity.

[@trevinbeattie4888]

Not what is was looking for. I was hoping to see some examples of Java byte code and how JVM interprets it, and examples of the machine(?) code that JIT compiles this to. Instead this video only talks about performance metrics of JIT-compiled code. The video hardly says anything about the inner workings of how JIT figures out what to compile nor anything else about JIT or the JVM.

[@illyam689]

Any advice on how to prewarm the vm?

[@satheeshmelb]

Azul System's Zing JVM with ReadyNow Technology www.azul.com/products/zing/readynow-technology-for-zing/

[@ashuzguitar]

RUN it first time. Store the loaded classes etc in a kind of cache. Next time when you run, just load the cache. Boom!

[@tobor.]

microwave

[@illyam689]

​@@tobor. 🤣I tried, but I got a TooWarmException

[@josephs.7960]

Didn't know Benjamin Franklin could code

[@govamurali2309]

🤣

[@ksrajavel]

Atleast the person in the video is providing life to learners! You are giving temporary laugh to trollers

[@ashuzguitar]

@@ksrajavel Chill bro.

[@ChristopherGray00]

@@ksrajavel that hair is an option, why someone would choose to have hair like that, i have no idea. i would rather be completely bald, not even kidding.

[@josephs.7960]

Came back to this video because of a recent project. Completely forgot about this comment.

[@tommywilliams7548]

black hole sum! black hole sum!

[@raskydamanik5067]

AgRee ! ... Ha... Ha ... LiaR :-)

[@astantine85]

God this was annoying