Shenandoah GC: Java Without The Garbage Collection Hiccups (Christine Flood)
Apache Spark is a fast and flexible compute engine for a variety of diverse workloads. Optimizing performance for different applications often requires an understanding of Spark internals and can be challenging for Spark application developers. In this session, learn how Facebook tunes Spark to run large-scale workloads reliably and efficiently. The speakers will begin by explaining the various to
Cassandra: tuning the JVM for read heavy workloads : Developers @ SHIFT
We recently completed a very successful round of Cassandra tuning here at SHIFT. This post will cover one of the most impactful adjustments we made, which was to the JVM garbage collection settings. I’ll be discussing how the JVM garbage collector works, how it was affecting our cluster performance, the adjustments we made, their effects, the reasoning behind them, and share the tools and techniqu
Garbage First Garbage Collector Tuning
Learn about how to adapt and tune the G1 GC for evaluation, analysis and performance. The Garbage First Garbage Collector (G1 GC) is the low-pause, server-style generational garbage collector for Java HotSpot VM. The G1 GC uses concurrent and parallel phases to achieve its target pause time and to maintain good throughput. When G1 GC determines that a garbage collection is necessary, it collects t
http://www.parleys.com/play/517f2503e4b0c6dcd95464ad/chapter0/about
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The Principles of Java Application Performance Tuning | CUBRID blog
This is the fifth article in the series of "Become a Java GC Expert". In the first issue Understanding Java Garbage Collection we have learned about the processes for different GC algorithms, about how GC works, what Young and Old Generation is, what you should know about the 5 types of GC in the new JDK 7, and what the performance implications are for each of these GC types. In the second article
AndroidのListViewを速くするためにやったこと
先日公開した、電話帳アプリ「OneHand Dialer」ですが、品質、性能面で問題ありとのご指摘を受けました。 今回は、備忘録も兼ねて、対策内容をまとめておきます。 Android ListViewを速くするためにやったこと 現象と原因 正規表現の使用は極力避ける Bitmapはキャッシュする BitmapはBitmapFactory.Optionsを使って縮小する おまけ：GC発生箇所の調査環境構築 1. 現象と原因 以下の現象が発生するとのことで、調査を行いました。 ・端末：GALAXYNexus（Android 4.0） ・起動時の読み込みに５秒ほどかかる ・データ件数は300〜400件程度 ・その他、よく落ちるとのこと（詳細不明） うーん…。 自分の端末での動作確認のときは、そんなに連絡先の件数が多くなかったこともあり、再現できてなかったのですが、 同等件数のデータと顔写真データ
「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
Ruby Garbage Collector Performance Tuning | Carpe Diem
Ruby のガベレージコレクションのパフォーマンスチューニングをする方法に環境変数を指定する方法があります。Ruby Enterprise Edition でも同様の設定が可能なので、パフォーマンスチューニングできるか試してみました。 以下、それぞれの環境変数の意訳です。 RUBY_HEAP_MIN_SLOTS: 最初のヒープスロット数です。デフォルトは、10000 です。 RUBY_HEAP_SLOTS_INCREMENT: Ruby が最初に新しいヒープを確保するときに必要な確保するために追加するヒープスロットの数です。デフォルトは、10000 です。例えば、デフォルトの GC 設定のとき、ヒープ上に 10000 の Ruby オブジェクトが存在しています。プログラムは他のオブジェクトを生成するとき、Ruby はそこに 10000 ヒープスロットで新しいヒープを確保するでしょう。合計で
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
Go: Severe memory problems on 32bit Linux | Hacker News
Wow. That third message, with suggestions for avoiding the bug, reads like a twisted joke. Highlights:"avoid struct types which contain both integer and pointer fields" "avoid data structures which form densely interconnected graphs at run-time" "avoid integer values which may alias at run-time to an address; make sure most integer values are fairly low (such as: below 10000)" I understand that th
DebuggingJavaPerformance.ppt
Debugging Java performance problems Ryan Matteson matty91@gmail.com http://prefetch.net Overview • Tonight I am going to discuss Java performance, and how opensource tools can be used to debug performance problems on production servers • I plan to split my 60-minutes into three parts: – Part 1 will provide an overview of the tools – Part 2 will show these tools in action – Part 3 will be a Q&A per
Solr & Lucene @ Etsy by Gregg Donovan
Solr & Lucene at Etsy provides concise summaries of Gregg Donovan's experience using Solr and Lucene at Etsy and TheLadders, including optimizations made to maximize performance out of the box, techniques for low-level hacking, and when each approach is best applied. Key points covered are maximizing Solr functionality, continuous deployment, cheap performance wins, and tools for low-level hacking
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Am I Reading Garbage Collection Logs Correctly?
GitHub - chewiebug/GCViewer: Fork of tagtraum industries' GCViewer. Tagtraum stopped development in 2008, I aim to improve support for Sun's / Oracle's java 1.6+ garbage collector logs (including G1 collector)
Understanding Java Garbage Collection and What You Can Do about It
Oracle Blogs
Netflix TechBlog
GitHub - twitter-archive/jvmgcprof: A simple utility for profile allocation and garbage collection activity in the JVM
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