Title: Graal @Twitter - Experiences in a production environment Abstract: HotSpot's optimizing Just-In-Time compiler C2 is reaching its end-of-life and it's time to look for alternatives. One very promising replacement candidate is Graal. Graal is a Java JIT compiler written in Java. It is being developed by Oracle Labs for a couple years now and has reached a state where it's viable to be that replacement. Twitter's huge distributed system tickles every corner of the JVM and is the perfect testing ground for a new JIT compiler technology like Graal. This presentation will talk about Twitter's experiences with Graal, good and bad, the bugs we found and also the wins. Bio: Chris Thalinger is a software engineer working on Java Virtual Machines for over 13 years. His main expertise is in compiler technology with Just-In-Time compilation in particular. Initially being involved with the CACAO and GNU Classpath projects, the focus shifted to OpenJDK as soon as Sun made the JDK open-source. Ever since Chris has worked on the HotSpot JVM at Sun, Oracle and now at Twitter.