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Defeating the out of memory in Tomcat
I’m working in a project dealing with a Flex client mapping application that uses remoting to communicate to a Tomcat 6.0.26 server using Blazeds + Spring 3.0.1 + iBatis + ActiveMQ 5.3.1, and jDK 1.6.0_20 . This application has the characteristic of producing a high amount of short live objects (roads, bridges, symbols) and a few long live objects. If I run Tomcat with the default JVM configurat
JMeter - User - Error on Java.lang.Out of memory Error: java heap space
Hi, Recently started using JMeter. when i run the script for 500 users it shows an error "Error on Java.lang.Out of memory Error: java heap space"... so please help me how can i solve this problem.... and can i get a information regarding What is the maximum users we can run in Jmeter???????????? Please Help meeeeeeee........ Advance thanks Regards, gautt
Cassandra Garbage Collection Tuning
Tweet Last week, I discussed our experiences with configuring Cassandra. As some of the commenters pointed out, my conclusions about the garbage collection were not fully accurate. I did some more experiments with different kinds of GC settings, which I will discuss in this post. On the bottom line, it is not that hard to get Cassandra run in a stable manner, but you still need a lot more heap spa
Jvm goes big_data_sfjava
SF Java presentation of jvm goes to big data. “Slowly yet surely the JVM is going to Big Data! In this fun filled presentation we see what pieces of Java & JVM triumph or unravel in the battle for performance at high scale!” Concurrency is the currency of scale on multi-core & the new generation of collections and non-blocking hashmaps are well worth the time taking a deep dive into. We take a qui
Nerds Central: Tuning The JVM For Unusual Uses - Have Some Tricks Under Your Hat
Tuning The JVM For Unusual Uses - Have Some Tricks Under Your Hat Knowing a little more about the guts of the JVM can make a huge difference, especially if you are coding off the beaten track. I have been working with Java all the way from Java 1.0 whilst I was as post doc' at Zurich University. Back then I used Java to create simple molecular visualisation applet for web-browsers. Apart from bei
Garbage Collector Performance Issues | Confluence Data Center 9.1 | Atlassian Documentation
Still need help? The Atlassian Community is here for you. Ask the community The information on this page relates to memory management with Oracle's Hotspot JVM. These recommendations are based on our support team's successful experiences with customers with large Confluence instances. Which garbage collector?Confluence uses the garbage first garbage collector (G1GC) by default. This is the garbage
PerformanceTechniques - HotSpot Internals for OpenJDK - wikis.sun.com
Performance techniques used in the Hotspot JVM What code shapes does the JVM optimize best? Here is a list. Knowing these optimizations may help language implementors generate bytecodes that run faster. Basic information about bytecodes is in Chapter 7 of the JVM Spec.. In the context of this discussion, "compiler" = "JIT", and usually more specifically refers to the server (or final tier) JIT. Ge
Video & Slides: Concurrency & Garbage Collection - Considerations as the JVM Goes to Big Data - Marakana
In this in-depth presentation, SriSatish Ambati, chief tinkerer of Java and Enterprise stacks at DataStax is going to dive deep into concurrency and garbage collection. SriSatish will start with a quick look at the next generation of serialization techniques, as well as implementation pitfalls around UUID. He'll also spend some time covering the internals of the memory model, and common GC algorit
The Java HotSpot Performance Engine Architecture
The Java HotSpot™ virtual machine implementation (Java HotSpot™ VM) is Sun Microsystems, Inc.'s high-performance VM for the Java platform. Java HotSpot technology provides the foundation for the Java SE platform, the premier solution for rapidly developing and deploying business-critical desktop and enterprise applications. Java SE technology is available for the Solaris Operating Environment (OE)
How Garbage Collection differs in the three big JVMs
Published May 11, 2011 Updated November 7, 2022 10 min read Most articles about Garbage Collection ignore the fact that the Sun Hotspot JVM is not the only game in town. In fact whenever you have to work with either IBM WebSphere or Oracle WebLogic you will run on a different runtime. While the concept of Garbage Collection is the same, the implementation is not and neither are the default setting
JavaのHeapDumpBeforeFullGCオプション
SunのJVMにはHeapDumpBeforeFullGCっていうオプションがあります。知ってました？このキーワードでぐぐっても200件程度しかひっかからないので知らない人も多いんじゃないかと思います。 あまり知られてなさそうなこのオプション。実はすごいできる子です。なんと、名前のとおりFullGC直前にヒープダンプだしてくれます。たとえばYoung領域使いすぎで昇格してしまうようなオブジェクトを探すときにこのオプション使うと大活躍してくれます。 このオプションは普通のオプションと違うので例によって-XX:+...で使います。こんな感じです。
Inspecting HotSpot JVM Options
Introduction A method for inspecting the comprehensive set of HotSpot JVM options and some examples comparing different outputs. Background The Oracle JVM provides an enormous spectrum of options to control the runtime JVM. These options are given a criminally short and non-comprehensive discussion at the OTN here. OTN divides these options into three categories: Behavioural, Performance and Debug
HotspotVMの圧縮oops
原文 翻訳：中村 成洋 更新 2010/09/19 るとさんからのご指摘で誤訳を修正 更新 2010/09/18 nminoruさんと、Dominion525さんのご指摘で誤訳を修正 oopってなに？ なんで圧縮する必要があるの？ Hotspotの専門用語である「oop（ordinary object pointer:通常のオブジェクトポインタ）」はオブジェクトへの管理ポインタのことだ。 通常はネイティブなポインタサイズと同じになる。つまり、LP64の環境であれば64ビットになるということだ。 ILP32の環境では、最大ヒープサイズは4GBより幾分か少なくなる。これは多くのアプリケーションにとって不十分だ。 じゃあ、LP64の環境ではというと、ほとんどの場合のヒープは、対応するIPL32の環境と比べて約1.5倍になってしまう（どちらも同じ状況と仮定）。 管理ポインタのサイズが増大してしまう
Cloudera Blog
Enterprises see embracing AI as a strategic imperative that will enable them to stay relevant in increasingly competitive markets. However, it remains difficult to quickly build these capabilities given the challenges with finding readily available talent and resources to get started rapidly on the AI journey. Cloudera recently signed a strategic collaboration agreement with Amazon […] Read blog p
Nerds Central: Java, JVM, JNI and Signal Handling Explained In Simple Terms
Java, JVM, JNI and Signal Handling Explained In Simple Terms Be a home with signals The Simple Guide To Why JVM's Raise Signals (deliberately) And What To Do About It! It is time I wrote this up because it is getting boring needing to work this out and explain it over and over again for myself and I am guessing anyone else! If you are using JNI on Linux, Solaris or AIX and get intermittent crashe
OTN Japan マニュアル
お探しのものを見つけるために、以下の項目を試してみてください。 キーワード検索のスペルを確認してください。 入力したキーワードの同義語を使用してください。たとえば、「ソフトウェア」の代わりに「アプリケーション」を試してみてください。 新しい検索を開始してください。
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Arnold Schwaighofer - Tail Call Optimization in the Java HotSpot(TM) VM
http://www.austinjug.org/presentations/JDK6PerfUpdate_Dec2009.pdf