November 2016 - java-devroom - lists.fosdem.org

Talk proposal: Diagnosing Issues in Java Apps using Thermostat and Byteman.
by Severin Gehwolf 08 Feb '17

08 Feb '17

Title: Diagnosing Issues in Java Apps using Thermostat and Byteman. Abstract: Thermostat is a monitoring and management tool for Java deployments, allowing users to measure and monitor a host of different performance aspects of their Java applications. Available metrics range from raw CPU and memory usage to operation of the Garbage Collector and JIT compiler through to thread activity and method call/heap profiles. Thermostat provides a GUI view of activity of local and distributed JVMs in a live-view or, alternatively, offline for after-the-fact analysis. What Thermostat cannot do on its own is track events and record statistics that are specific to a given Java application, at least not unless the application co-operates with it, for example by publishing JMX statistics that Thermostat can read, persist and display in its GUI. However, that's about to change thanks to work Thermostat developers have been doing to integrate Byteman into Thermostat. Byteman is a tool which can be used to modify the behaviour of Java programs by injecting extra Java code almost anywhere in the program. You don't need to recompile your program or even prepare it in advance in order for this to work. You can specify changes to the program on the command line but, what is more amazing, you can actually use Byteman to change the way a program runs after startup while it is still running. In this talk we will show how Thermostat can collect and visualize metrics with Byteman's help in order to better understand a specific performance issue in a Java application. Bio: Severin Gehwolf is a Senior Software Engineer at Red Hat. He is part of Red Hat's OpenJDK team primarily working on JVM tooling. Severin is an upstream OpenJDK committer and is part of the Thermostat development team since 2012. Most recently, he has worked on Thermostat's Byteman plugin together with Andrew Dinn - the author of Byteman. Cheers, Severin

1 1

Talk proposal: Optimizing Errors Away
by Volker Simonis 25 Nov '16

25 Nov '16

Title: Optimizing Errors Away Abstract: The HotSpot JIT compilers use a lot of sophisticated optimization techniques to speed up your Java code. Sometimes, these advanced optimizations are so aggressive that they may eliminate required checks by mistake and therefore suppress expected program errors. In this talk, I'll briefly introduce Escape Analysis and Intrinsics, two commonly used HotSpot optimization techniques. I'll show how a combination of these two features can optimize away IndexOutOfBoundsExceptions in some corner cases where they are required by the standard and how I fixed this error in recent versions of the OpenJDK. Bio: Volker Simonis works in SAP JVM Technology group. He is an OpenJDK contributor from the very beginning and helped SAP engage in the OpenJDK project. He's the project lead of the OpenJDK PowerPC/AIX and s390x porting projects, a JDK9 reviewer and JCP Executive Committee representative for SAP. Recording me on audio/video is acceptable under a CC-BY-2.0 license. Thank you and best regards, Volker

1 0

Talk proposal: Eclipse 4.7 Platform - The new greatness
by Lars Vogel 01 Nov '16

01 Nov '16

Hi, would be great to join the Open Java track again with Eclipse. Talk description: ----------- This talk will cover the latest development and organizational news of the free and Open Source Eclipse IDE. You will learn for example what we are doing to improve Java tool performance by a factor by 1000 and why we think developing support for a new programming will be much easier with the new release. I also cover how people can contribute to the project. ------------ About me: ------------ Lars Vogel is one of the core developers of the Eclipse platform project, project lead of several eclipse projects and member of the Eclipse PMC. He is also a contributor a several other Eclipse projects. He loves to share his knowledge by writing online tutorials and book and is a regular speaker at international conferences. ------------ Let me know if that is not the correct way to propose a talk. Best regards, Lars -- Eclipse Platform UI and e4 project co-lead CEO vogella GmbH Haindaalwisch 17a, 22395 Hamburg Amtsgericht Hamburg: HRB 127058 Geschäftsführer: Lars Vogel, Jennifer Nerlich de Vogel USt-IdNr.: DE284122352 Fax (040) 5247 6322, Email: lars.vogel(a)vogella.com, Web: http://www.vogella.com

1 0