JITWatch update

[Chris Newland]

Hey all,

Here are some recent developments in JITWatch:

1) OSR highlighting in the TriView - you can now see which loop was compiled

Tweet: https://twitter.com/chriswhocodes/status/922230297026007041

Image: https://pbs.twimg.com/media/DMxrXJaWAAE9WtB.png

This lead me to notice that C1 OSR compilations included the whole method not just the loop. Asked a question and got this great explanation from Kris Mok and Vladimir Ivanov: https://github.com/AdoptOpenJDK/jitwatch/wiki/Understanding-the-On-Stack-Replacement-(OSR)-optimisation-in-the-HotSpot-C1-compiler

2) Quite a few bug fixes and some closed issues:

https://github.com/AdoptOpenJDK/jitwatch/issues?q=is%3Aissue+is%3Aclosed

3) I'm contributing a chapter to a new book on Java performance "Optimizing Java" by Ben Evans and James Gough: http://shop.oreilly.com/product/0636920042983.do

4) Next up I want to fix the issue with Graal logs and get 1st class support for it in JITWatch. Also want to do some more diving into JDK9 HotSpot logs to see what extra info I can present.

Cheers,

Chris