November 2017 - java-devroom - lists.fosdem.org

Talk proposal: Graal: How to use the new JVM JIT compiler in real life
by Christian Thalinger 30 Nov '17

30 Nov '17

Title: Graal: How to use the new JVM JIT compiler in real life Abstract: With JEP 317: Experimental Java-Based JIT Compiler it is very likely that Graal will be part of JDK 10. In fact, Graal is already available in JDK 9 due to JEP 243: Java-Level JVM Compiler Interface. Graal is itself written in Java and that brings some new properties and behavior to the table which we haven’t seen with existing HotSpot JIT compilers. This talk will show how to use Graal with JDK 9, how to compile an upstream Graal version and what to look out for when using it for benchmarking or even in production. Speaker: Chris Thalinger - Staff Software Engineer at Twitter 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. Time: can do 25 minutes but 45 minutes would obviously be better Twitter: @christhalinger

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Talk proposal: Class Data Sharing - Sharing Economy in the HotSpot VM
by Volker Simonis 30 Nov '17

30 Nov '17

Title: Class Data Sharing - Sharing Economy in the HotSpot VM Abstract: Class Data Sharing (CDS) is a feature that was introduced in Java 5 to improve startup performance and reduce the memory footprint of the JVM by sharing the metadata of system classes between virtual machines running on the same host. During the last years, this feature has been constantly improved. In OpenJDK 10 CDS will be extended by AppCDS which additionally allows the sharing of application classes between VM instances (see JEP 310: Application Class-Data Sharing [1]). In this talk I will briefly introduce CDS and AppCDS. After demonstrating its various use cases, I will do a short deep-dive into the implementation details and challenges. Finally I will briefly describe how Strings and Symbols can be stored in the CDS archive and shared across VM as well since OpenJDK 9. After the talk, the audience should have a better understand of the CDS/AppCDS feature and be able to decide whether it makes sense to use it for their own applications. [1] http://openjdk.java.net/jeps/310 Recording me on video and/or audio under CC-BY-2.0 license is OK. Bio: Volker Simonis works in SAP JVM Technology group. He is an OpenJDK contributor from the very beginning and helped SAP to engage in the OpenJDK project. He's the project lead of the OpenJDK PowerPC/AIX and s390x porting projects, a JDK reviewer and JCP Executive Committee representative for SAP. He's also a member of the JCP JSR 379 (Java SE 9) and JSR 383 (Java SE 10) Expert Groups.

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Talk proposal: G1 - Not^H^H^HNever Done!
by Thomas Schatzl 30 Nov '17

30 Nov '17

Title: G1 - Not^H^H^HNever Done! Abstract: In JDK 9 we made the G1 garbage collector the default OpenJDK garbage collector. Does that mean G1 is done? Definitely not! The Oracle GC team is working on exciting changes to improve throughput, latency and memory footprint for the G1 garbage collector for the next JDKs. We are excited to give you a heads up on a few of them: * Faster Card Scanning * Parallel Full GC in G1 * Rebuild Remembered Sets On The Fly * Abortable Mixed GCs * Automatic Thread Sizing Of course, this is just what we are currently working on; we would also like to share a few interesting ideas that would be interesting to pick up and contribute. :) Speaker: Thomas Schatzl, OpenJDK developer working at Oracle; working on garbage collection for 8+ years; previously contributor to the FreePascal open source Pascal compiler. Time: 25 min, but can be extended to 45 mins Recording video and/or audio CC-BY-2.0 license: Thomas Schatzl: fine Blog & Microblog: Thomas Schatzl: - Thanks, Thomas

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Talk proposal: The OpenJDK Developer Experience
by Erik Helin 30 Nov '17

30 Nov '17

Title: The OpenJDK Developer Experience Abstract: Much has happened in the last year for developers contributing to OpenJDK: - the repositories have been consolidated into a single repository - the run-test make target has been introduced - the JTReg (and jcov, asmtools and jtharness) build have been greatly improved - there is now a binary build of OpenJDK that can be used as --boot-jdk (on Linux x86-64) The situation for HotSpot developers has also improved over the years: - the HotSpot build system was converted to the "new" build system - a proper unit test framework for C++ code (googletest) was added - debug symbols are no longer zipped by default - the JDK and HotSpot JTReg testlibraries were combined into one This talk will show how all these changes make the OpenJDK developer experience a lot smoother. The speakers will also share their personal tips and tricks on how to work even faster on OpenJDK! We also realize that the OpenJDK developer experience is far from optimal, and would therefore like this talk to initiate a discussion on what could be improved and how people can get involved. Speakers: - Erik Duveblad (formerly Helin), OpenJDK developer working at Oracle - Roman Kennke, OpenJDK developer working at Red Hat Time: 25 min Recording video and/or audio CC-BY-2.0 license: Erik Duveblad: fine Roman Kennke: fine Blog: Erik Duveblad: - Roman Kennke: https://rkennke.wordpress.com Microblog: Erik Duveblad: - Roman Kennke: @rkennke on Twitter Thanks, Erik & Roman

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Propsal: Rubber 'Duke' Debugging
by Blackbeard334 30 Nov '17

30 Nov '17

Abstract: In the spirit of Jon Bentley(not the top gear dude), we will take this chance to talk about everybody’s favorite pastime...debugging! As programmers, we spend most of our time debugging. I know I know, most of us never 'write' any bugs(it's ALWAYS your pesky colleagues). Still, somebody has to clean it all up. And yet, there's very little literature about debugging. Fewer conference talks still. But that's about to change. This talk will be a collection of real-life bug micro-mortems. Proving now more than ever, that for want of a nail, kingdoms can really be lost... Twitter: @blackbeard0x14e Cheers, Mahmoud Abdelghany

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FOSDEM 2018, Free Java Dev Room, Talk Proposal: Packet Capturing with the JVM and Clojure - Yes, we can!
by Ruediger Gad 28 Nov '17

28 Nov '17

Hi, below, I send my talk proposal for the FOSDEM 2018 Free Java Dev Room: ----------------- Title: Packet Capturing with the JVM and Clojure - Yes, we can! Abstract: In this talk, it will be shown that packet capturing with the JVM and Clojure works fast, how it is made fast, and that Clojure and the JVM offer amazing capabilities for processing stream and batch data. Following a bottom-up approach, the covered topics include: - integration of low-level packet capturing with the JVM via JNI, - acceleration of packet capturing with the JVM up to the magnitude of 10 GBit/s speed, - a Domain Specific Language (DSL) for easing the extraction of information from raw binary data, - a self-adaptive mechanism for automatically adjusting data processing at run-time, - and using the Clojure-based DSL for improving the import of packet capturing data in Eclipse Trace Compass. The talk will provide an overview of the covered topics. More details were published in various peer-reviewed conferences and workshops, the speakers PhD thesis, and as Open Source Software (See, e.g.: https://ruedigergad.com/publications/) While this talk focuses on packet capturing, the presented topics can also be applied to other application domains. Recording me on audio and/or video: acceptable under a CC-BY-2.0 license (DEFAULT) Brief Bio: Ruediger Gad is a computer science and Open Source Software (OSS) enthusiast who was and still is involved in various OSS projects. He works as Project Manager R&D at Terma GmbH, Darmstadt, Germany in the field of space ground systems. He received a PhD degree (sobresaliente cum laude - best grade with honors) in computer science from the University of Cádiz, Spain, and regularly publishes his evaluation and research prototypes as OSS. He spoke at various academic conferences and workshops in scope of the technical program and in keynotes. His research interests include Event-Driven Architecture (EDA), Message-oriented Middleware (MoM), Complex Event Processing (CEP), computer networks, and software development and engineering. Microblog URL: https://twitter.com/ruedigergad Blog URL: https://ruedigergad.com/ Additional Notes: The talk is an adjusted and somewhat extended version of a talk already held at :clojureD 2017. Video: https://www.youtube.com/watch?v=mmkfifQMwT0 Slides: https://ruedigergad.files.wordpress.com/2017/02/presentation_ruediger_gad_c… The adjustments primarily concern the reduction of Clojure implementation details and the addition of the Clojure-based DSL packet capture data import for Eclipse Trace Compass. ----------------- If you have questions, comments, etc. please let me know. Thank you and cheers, Ruediger

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Java 10, 11, 12+ what are the futures of the VM spec ?
by Remi Forax 22 Nov '17

22 Nov '17

With the new release cadence of the OpenJDK, VM changes will appear faster than ever. What are the features that are planned to be integrated in the VM in the future ? Come if you want to heard about the new JVM bestiary: NestMates, Constant Dynamic, Minimum Value Type, etc. and/or want a sneak preview of how Java the language can/will use all these beasts. cheers, Rémi

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Proposal: MethodHandles Everywhere!
by Charles Oliver Nutter 22 Nov '17

22 Nov '17

The MethodHandle API was added in Java 7, as a way to programmatically build up smart function pointers. Far more powerful than simple reflection, handles JIT and optimize like Java code, producing a fast, direct, type-safe callable. And the API has continued to evolve: in Java 9, you can now embed atomic semantics, array views, loops and "finally" logic, and much more. Come learn how flexible and useful MethodHandles can be! - Charlie

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