Understanding JVM Internals | CUBRID blog
Every developer who uses Java knows that Java bytecode runs in a JRE (Java Runtime Environment). The most important element of the JRE is Java Virtual Machine (JVM), which analyzes and executes Java byte code. Java developers do not need to know how JVM works. So many great applications and libraries have already been developed without developers understanding JVM deeply. However, if you understan
Invoke Interface Optimisations
I'm often asked about the performance differences between Java, C, and C++, and which is better. As with most things in life there is no black and white answer. A lot is often discussed about how managed runtime based languages offer less performance than their statically compiled compatriots. There are however a few tricks available to managed runtimes that can provide optimisation opportuniti
Memory Access Patterns Are Important
In high-performance computing it is often said that the cost of a cache-miss is the largest performance penalty for an algorithm. For many years the increase in speed of our processors has greatly outstripped latency gains to main-memory. Bandwidth to main-memory has greatly increased via wider, and multi-channel, buses however the latency has not significantly reduced. To hide this latency our
VMKit: a substrate for virtual machines
You can still play with the last VMKit release, but the project is not more maintained. Moreover, the information on these pages may be out of date. If you are interested in restarting the project, please contact Gaël Thomas Current MREs are monolithic. Extending them to propose new features or reusing them to execute new languages is difficult. VMKit is a library that eases the development of new
A First Taste of InvokeDynamic
Charles Oliver Nutter Java, Ruby, and JVM guy trying to make sense of it all Greetings, readers! Over the past couple weeks I've had a few departures from typical JRuby development. I consider it a working vacation. I'm hoping to report on all of it soon, but for now we'll focus on one of the most exciting items: JSR-292, otherwise known as "InvokeDynamic". I've reported on invokedynamic previousl
200910-VMIL
Bytecodes meet Combinators: invokedynamic on the JVM John R. Rose Sun Microsystems john.rose@sun.com Abstract The Java Virtual Machine (JVM) has been widely adopted in part because of its classfile format, which is portable, compact, modu- lar, verifiable, and reasonably easy to work with. However, it was designed for just one language—Java—and so when it is used to express programs in other sourc
Nerds Central: Facebook Moving To The JVM
"Are interpreters immoral?" A question I posed some months ago which might soon become irrelevant. General purpose interpretors are about to go the way of general purpose punch cards! Facebook are looking to move PHP on. Why, because clock cycles cost money. Their first approach was hiphop, a PHP to C+++ cross compiler. Now they are looking into compiling PHP to run on the multi-language VM. The
Nerds Central: Facebook Moving To The JVM
The Big Guns get behind mlvm. I mean, BIG like GE, and Facebook! "Are interpreters immoral?" A question I posed some months ago which might soon become irrelevant. General purpose interpretors are about to go the way of general purpose punch cards! Facebook are looking to move PHP on. Why, because clock cycles cost money. Their first approach was hiphop, a PHP to C+++ cross compiler. Now they are
「Tuning JavaSE for Throughput and Latency」セミナー - torutkのブログ
日本オラクル開催のセミナー「Tuning JavaSE for Throughput and Latency」を受講しました。 もともとはJavaOne Tokyo 2012のプログラムだったものが開催できず今日あらためて開催したとのことです。 スライドは、Charlie Hunt氏*1作成のもので、説明は日本オラクルのサポートエンジニアの方からでした。（講師の方のブログ発見） http://d.hatena.ne.jp/ytoshima/20120606/1338992985 内容はHunt氏が著した次の書籍に基づくものとのことです。 Java Performance (Java Series) 作者: Charlie Hunt,Binu John出版社/メーカー: Prentice Hall発売日: 2011/10/04メディア: ペーパーバック購入: 1人 クリック: 49回この商品
Tuning JVM for a VM - Lessons Learned, Directly from VMware - Marakana
Ben Corrie from VMware gave a talk on March 15, 2012 at the San Francisco Java Usergroup on tuning the JVM for a virtual machine. The event was filled to capacity, but fortunately you can find the video, slides, and a more detailed description of the talk below. The number of Java workloads running on virtualized infrastructure has been increasing exponentially over the last few years. Advancemen
HotSpot JVM garbage collection options cheat sheet (v2)
In this article I have collected a list of options related to GC tuning in JVM. This is not a comprehensive list, I have only collected options which I use in practice (or at least understand why I may want to use them). Compared to previous version a few useful diagnostic options was added. Additionally section for G1 specific options was introduced. PDF version
CMS heap fragmentation. Follow up 1
I have recently published an article Java GC, HotSpot's CMS and heap fragmentation. Post has lead to a number of interesting discussions and here I want to present some hard numbers from my experiments to back up these discussions. Test application is a synthetic application. It is allocating byte arrays of random size and eventually releasing them (with fairly complex pattern). Though application
Microsoft PowerPoint - PS_TS-2885_285885_158-1_FIN_vD3F
2007 JavaOneSM Conference | Session TS-2885 | TS-2885 High Performance Java Technology in a Multi-Core World David Dagastine Paul Hohensee VM Technologies Sun Microsystems, Inc. http://java.sun.com 2007 JavaOneSM Conference | Session TS-2885 | 2 What To Expect Learn about today’s multi-core architectures and the Java™ Virtual Machine (JVM™ Tool) technologies and software optimization techniques to
IDF
How to Get the Most Performance from Sun* JVM* on Intel® Multi-Core Servers Kingsum Chow, Intel Senior Staff Engineer Dave Dagastine, Sun Senior Staff Engineer SSGS003 Agenda Intel, Sun and Java – really? Hardware Features on Hardware Features on Intel® Xeon® Processor-based servers Optimizing Java SE for Multi-Core Systems Performance Tuning Case Studies Summary 2 Intel, Sun and Java – Reall
[JavaSpecialists 124] - Copying Arrays Fast
124Copying Arrays FastAuthor: Dr. Heinz M. KabutzDate: 2006-03-28Java Version: 5Category: Performance Abstract: In this newsletter we look at the difference in performance between cloning and copying an array of bytes. Beware of the Microbenchmark! We also show how misleading such a test can be, but explain why the cloning is so much slower for small arrays. Welcome to the 124th edition of The Jav
Microsoft PowerPoint - memory-efficient java with notes.ppt
Building Memory-efficient Java Applications Nick Mitchell, Gary Sevitsky (presenter) IBM TJ Watson Research Center Hawthorne, NY USA Copyright is held by the author/owner(s). OOPSLA 2008, October 19–23, 2008, Nashville, Tennessee, USA. ACM 978-1-60558-220-7/08/10. Quiz Small boxes? Q: What is the size ratio of Integer to int? a. 1 : 1 b. 1.33 : 1 c. 2 : 1 d. ? Assume 32-bit platform Small boxes?
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Adaptive optimization of JIT compiler
Welcome to OpenJDK Internals’s documentation! — OpenJDK Internals 1.0 documentation
Azulがオープンソースコミュニティプロジェクトに無料で、Zing JVM を提供。
Frequently Asked Questions About the Java HotSpot VM