Norikraã®JVMãƒãƒ¥ãƒ¼ãƒ³ã§è‹¦åŠ´ã—ã¦ã„る話1. Norikraã®JVMãƒãƒ¥ãƒ¼ãƒ³ã§ 苦労ã—ã¦ã„る話 #jvmcasual JVM Operation Casual Talks 2014/04/07 at LINE @tagomoris (TAGOMORI Satoshi) 14å¹´4月7日月曜日
Garbage Collection Optimization for High-Throughput and Low-Latency Java Applications
Garbage Collection Optimization for High-Throughput and Low-Latency Java Applications High-performance applications form the backbone of the modern web. At LinkedIn, a number of internal high-throughput services cater to thousands of user requests per second. For optimal user experience, it is very important to serve these requests with low latency. For example, a product our members use regularly
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4/7ã«ã€LINEã•ã‚“ã®ã‚ªãƒ•ã‚£ã‚¹ã§é–‹å‚¬ã•ã‚ŒãŸã€ŒJVM Operation Casual Talksã€ã€‚ 一部ã§ã€Cassandra Casualã ã£ãŸã®ã§ã¯ãªã„ã‹ã¨ã„ã†ç–‘惑もã‚ã‚Šã¾ã—ãŸãŒã€ãªã‹ãªã‹ãŸã‚ã«ãªã‚‹è©±ãŒå¤šãã¦ã€ã‚ã¨ã§ãã£ã¨è³‡æ–™ã‚’見ãŸããªã‚‹æ—¥ãŒæ¥ãã†ãªã®ã§ã€ã¡ã‚‡ã£ã¨ã¾ã¨ã‚ã¦ãŠã“ã†ã¨æ€ã†ã€‚ ã“ã¡ã‚‰ã‚‚ã‚ã‚ã›ã¦èªã¿ãŸã„ JVM Operation Casual Talks #jvmcasual - Togetter Understanding Memory Management of JavaVM
 in 15 minutes (@stanakaã•ã‚“) https://speakerdeck.com/stanaka/understanding-memory-management-of-javavm-in-15-minutes @stanakaã•ã‚“ã€ã©ã“ã§JVM使ã£ã¦ã‚‹ã®ã‹ã¨æ€ã£ãŸã‚‰ã€ä»Šæ—¥ã¯
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先日ã®JVM Operations Casual Talksã€GCやメモリ管ç†ã«ã¤ã„ã¦ã¾ã¨ã¾ã£ãŸç™ºè¡¨ã‚„ã€ãƒ¢ãƒ‹ã‚¿ãƒªãƒ³ã‚°ã®æ‰‹æ³•ãªã©ã®è©±ãŒèžã‘ã¦ã‚ˆã„会ã§ã—ãŸã€‚ 微妙ã«æ„è˜ãŒé«˜ã¾ã£ã¦ã„ã‚‹ã¨ã“ã‚ã§ã€ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ã‚„GCã®çµ±è¨ˆæƒ…å ±ã‚’å–å¾—ã—ã¦ã€GrowthForecastã§ã‚°ãƒ©ãƒ•ã‚’作ã£ã¦ãれるスクリプトを書ãã¾ã—ãŸã€‚ãã‚ŒPlaã€ãã‚ŒFluentdç³»ã®ã‚„ã¤ã§ã™ https://github.com/kazeburo/jstat2gf ã“ã®å…ƒãƒã‚¿ã¯ JVM Operation Casual Talksã§ã®ãƒ¢ãƒªã‚¹ã•ã‚“ã®ç™ºè¡¨ã«ã§ã¦ããŸã‚°ãƒ©ãƒ•ã§ã™ã€‚ã‚れを簡å˜ã«ä½œã‚Œã‚‹ãƒ„ールã«ãªã‚Šã¾ã™ã€‚ æŸJVMã®ãƒ—ãƒã‚»ã‚¹ã«å¯¾ã—ã¦å®Ÿè¡Œã™ã‚‹ã¨ã€ã“ã‚“ãªæ„Ÿã˜ã®ã‚°ãƒ©ãƒ•ã«ãªã‚Šã¾ã™ã€‚上ã‹ã‚‰ã€ŒNEWé ˜åŸŸã€ã€ŒOLDé ˜åŸŸã€ã€ŒPermamenté ˜åŸŸã€ã€Œ1秒ã‚ãŸã‚Šã®Full GCã®å›žæ•°ã€ã€Œ1秒ã‚ãŸã‚Šã®Full GCã«ã‹ã‹ã£ãŸæ™‚é–“ã€ã¨ãªã£ã¦ã„ã¾ã™ã€‚ ãªã‚“ã‹F
JJUG CCC 2013 Fall「JVMコードリーディング入門ã€è³‡æ–™å…¬é–‹ - 虎塚
土曜ã«JJUG CCC 2013 Fall（http://www.java-users.jp/?page_id=695）ã¸è¡Œã£ã¦ãã¾ã—ãŸã€‚ 事å‰ã«ãŠçŸ¥ã‚‰ã›ã™ã‚‹ã®ã‚’忘れã¦ã„ã¾ã—ãŸãŒã€17:15〜18:05ã®ã‚»ãƒƒã‚·ãƒ§ãƒ³ã§JVMã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ãƒªãƒ¼ãƒ‡ã‚£ãƒ³ã‚°ã«ã¤ã„ã¦ãŠè©±ã—ã—ã¾ã—ãŸã®ã§ã€ç™ºè¡¨è³‡æ–™ã‚’公開ã—ã¾ã™ã€‚ R5-5 JVMコードリーディング入門 〜JVMã®OS抽象化レイヤーã«ã¤ã„ã¦ã€œ JVMã®ã‚³ãƒ¼ãƒ‰ã‚’èªã¿ã¯ã˜ã‚ãŸã°ã‹ã‚Šã®æ–¹ã‚’対象ã«ã€JVMã¨OSã®ãƒ¡ãƒ¢ãƒªã‚’ä¸å¿ƒã¨ã—ãŸé–¢ä¿‚性ã«ã¤ã„ã¦ãŠè©±ã—ã—ã¾ã™ã€‚JVMã¯OSã‹ã‚‰ã©ã®ã‚ˆã†ã«ãƒ¡ãƒ¢ãƒªã‚’確ä¿ã—ã¦ã„ã‚‹ã®ã§ã—ょã†ã‹ï¼Ÿ ãã‚“ãªç´ 朴ãªç–‘å•ã‚’ã‚‚ã¨ã«ã€JVMã®ã‚³ãƒ¼ãƒ‰ã‚’楽ã—ã追ã„ã‹ã‘ã¦ã¿ã¾ã—ょã†ã€‚※ã“ã®ã‚»ãƒƒã‚·ãƒ§ãƒ³ã¯å…¥é–€è€…å‘ã‘ã§ã™ã€‚ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã‚„GCã«ã¤ã„ã¦ã¯æ‰±ã„ã¾ã›ã‚“。 虎塚 (ã•ãらã°çµ„) http://www.java-users.jp/?page_id=709#r5-
InvokeDynamic 㨠Javascript - 新コンパイラ Dyn.js 㨠Oracle Nashorn，Rhino
Spring Bootã«ã‚ˆã‚‹APIãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰æ§‹ç¯‰å®Ÿè·µã‚¬ã‚¤ãƒ‰ 第2版 何åƒäººã‚‚ã®é–‹ç™ºè€…ãŒã€InfoQã®ãƒŸãƒ‹ãƒ–ック「Practical Guide to Building an API Back End with Spring Bootã€ã‹ã‚‰ã€Spring Bootを使ã£ãŸREST API構築ã®åŸºç¤Žã‚’å¦ã‚“ã 。ã“ã®æœ¬ã§ã¯ã€å‡ºç‰ˆæ™‚ã«æ–°ã—ãリリースã•ã‚ŒãŸãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã‚ã‚‹ Spring Boot 2 を使用ã—ã¦ã„る。ã—ã‹ã—ã€Spring Boot3ãŒæœ€è¿‘リリースã•ã‚Œã€é‡è¦ãªå¤‰...
CMSPermGenSweepingEnabled vs CMSClassUnloadingEnabled
I've kind of asked this question before - What does JVM flag CMSClassUnloadingEnabled actually do?, but this time it's slightly different! If I start a Java VM with the -XX:+CMSPermGenSweepingEnabled flag set, the following message is printed: Please use CMSClassUnloadingEnabled in place of CMSPermGenSweepingEnabled in the future The -XX:+CMSPermGenSweepingEnabled flag is often used to mitigate ag
What does JVM flag CMSClassUnloadingEnabled actually do?
I cannot for the life of me find a definition of what the Java VM flag CMSClassUnloadingEnabled actually does, other than some very fuzzy high-level definitions such as "gets rid of your PermGen problems" (which it doesn't, btw). I have looked on Sun's/Oracle's site, and even the options list doesn't actually say what it does. Based upon the name of the flag, I'm guessing that the CMS Garbage Coll
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Azul Systems Launches Open Initiative for Improving Managed Runtimes | Azul Systems: Run, Scale, Simplify Your Java Application Platform
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