JDK Flight Recorder introduced in OpenJDK 11.
This feature is low overhead of profiling and be able to used on production environment.
High Performance recording engine is embedded to Hotspot VM.
JDK Flight Recorder introduced in OpenJDK 11.
This feature is low overhead of profiling and be able to used on production environment.
High Performance recording engine is embedded to Hotspot VM.
Introduction to GraalVM and Native ImageKoichi Sakata
2019/08/23 JVM Language Summit Report Event at KanJava JUG
https://kanjava.connpass.com/event/139770/
This slide is about GraalVM, especially SubstrateVM that is able to generate native images.
GraalVM を普通の Java VM として使う ~クラウドベンチマークなどでの比較~Shinji Takao
クラウドや多言語の環境に対応できる 新しいJava実行環境 GraalVM は、ネイティブビルドだけでなく、通常の Java VM として使うこともできます。
このたび、クラウド環境用ベンチマーク「BluePerf」などを使い、GraalVM と OpenJDK を比較したので、結果を報告します。
Japan Java User Group (JJUG) Cross Community Conference (CCC) 2021 Fall 発表資料
https://www.youtube.com/watch?v=5MtjfQfdC_g
2015 0228 OpenStack swift; GMO Internet ServicesNaoto Gohko
GMO Internet Inc., has been service provided by the quotient material made of the fact that OpenStack Swift the ConoHa VPS brand and GMO Apps Cloud. discussed the differences between the physical configuration of the OpenStack Swift at rackspace and ConoHa, was carried out optimization of the configuration.
In addition, you have an implementation that provided by Dual-head on multiple merchandise by invoking the swift-proxy for each service.
Head toward Java 14 and Java 15 #LINE_DMYuji Kubota
Java 14 and 15 introduced several new features and changes including records, pattern matching, text blocks, and updates to the garbage collector. Some notable changes were the addition of records as a new data type, enabling pattern matching for instanceof, and deprecating biased locking and the CMS garbage collector. Tools were also improved with the packaging tool to create installers and event streaming to collect JVM events.
This document discusses new features and changes in Java 14 and previews for Java 15. For Java 14, it outlines 16 JEPs including helpful null pointer exceptions, NUMA-aware memory allocation, and removing legacy garbage collectors. It also covers new tools like JFR event streaming and the packaging tool. For Java 15, hidden classes, removing Nashorn, and low-latency garbage collectors like ZGC and Shenandoah are previewed. Overall it provides a concise yet informative summary of major changes and previews for Java 14 and 15.
JavaOne 2017 報告会 at Japan Java User Group
デモのコード:https://github.com/ykubota/jigsaw-sample_jp
イベントページ:https://jjug.doorkeeper.jp/events/66256
Stream: https://www.youtube.com/watch?v=XT2tIh9r6Eo
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Secrets of Rock Star Developers (and How to Become One!) [CON7615] (Yuji KUBO...Yuji Kubota
Kubota Yuji is a Java technical support engineer at NTT and a hard-of-hearing open source developer. He recommends reading code and writing code through trial and error. Maintaining documentation and comments is important to help others. Conversation through chat, mailing lists, and tweets from conferences help hard-of-hearing developers. Written knowledge from articles and books also provide assistance, as do watching sessions on YouTube with subtitles. Attending JUGs can introduce developers to professionals. With helpful accessibility options and kind communities, hard-of-hearing people need not give up on becoming good developers.
The document discusses using jcmd to troubleshoot Java applications. It provides an overview of the jcmd command and describes the various domains and suffixes that can be used with jcmd to obtain diagnostic information or control the JVM. These include getting thread dumps, heap details, JIT compiler data, and configuring Java logging. The document also demonstrates some example jcmd commands.
JavaOne 2016 Java SE Feedback #jjug #j1jpYuji Kubota
Slide for reporting Java SE Feedback of JavaOne 2016 at Japan Java User Group. Especially, this slide introduces the changes required for Java 9.
https://jjug.doorkeeper.jp/events/52639