Garbage First Garbage Collection (G1 GC) #jjug_ccc #ccc_cd6
* 2015/12/01 12:40 ä¿®æ£ * P.65 ã®1段è½ç›®ã®è¡¨ç¾ã‚’ä¿®æ£ã—ã¾ã—ãŸã€‚(ä¸è¦ã‚ªãƒ–ジェクトãŒé–¾å€¤ã‚’上回る -> 生å˜ã‚ªãƒ–ジェクトãŒé–¾å€¤ã‚’下回る) 表ç¾ã ã‘見るã¨å†…容ã¯ä¸€ç·’ãªã®ã§ã™ãŒã€ã‚ªãƒ—ションã§æŒ‡å®šå¯èƒ½ãªé–¾å€¤ã®æ„味を考慮ã™ã‚‹ã¨ä¿®æ£å‰ã®æ–‡ç« ã¯èª¤ã‚Šã§ã—ãŸã€‚ Introduction of G1 GC at JJUG CCC 2015 Fall. http://www.java-users.jp/?page_id=2056Read less
Hotspot VMã®åŸºæœ¬æ§‹é€ ã‚’ç†è§£ã™ã‚‹
J2EEãŒãƒŸãƒƒã‚·ãƒ§ãƒ³ã‚¯ãƒªãƒ†ã‚£ã‚«ãƒ«ãªåˆ†é‡Žã«é©ç”¨ã•ã‚Œã‚‹ã‚ˆã†ã«ãªã‚Šã€Javaã®ãƒ‘フォーマンスãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã®é‡è¦æ€§ã¯ã•ã‚‰ã«é«˜ã¾ã£ã¦ã„ã¾ã™ã€‚パフォーマンスãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«ã¯ã•ã¾ã–ã¾ãªãƒ‘ラメータãŒã‚ã‚Šã¾ã™ãŒã€ä¸ã§ã‚‚Java VMã«é–¢é€£ã™ã‚‹ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã®åŠ¹æžœã¯å¤§ãã„ã¨ã„ã‚ã‚Œã¦ã„ã¾ã™ã€‚本稿ã¯ã€Java VMã«é–¢é€£ã™ã‚‹ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°æ‰‹æ³•ã‚’å¦ã¶ãŸã‚ã®å‰æ知è˜ã‚’æä¾›ã™ã‚‹ã“ã¨ã‚’目的ã«ã—ã¦ã„ã¾ã™ï¼ˆç·¨é›†éƒ¨ï¼‰ã€‚ Java VMã«é–¢é€£ã™ã‚‹ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã‚’è¡Œã„ã€J2EEアプリケーションã®ãƒ‘フォーマンスを上ã’ã‚‹ãŸã‚ã«ã¯ã€Java VMã«ã¤ã„ã¦è©³ã—ã知る必è¦ãŒã‚ã‚Šã¾ã™ã€‚本稿ã¯2回ã«æ¸¡ã£ã¦Java VMã®åŸºæœ¬æ§‹é€ ã¨å‹•ä½œåŽŸç†ã‚’詳細ã«è§£èª¬ã—ã¾ã™ãŒã€å†…容をç†è§£ã™ã‚‹ãŸã‚ã«ã¯ãƒ—ãƒã‚°ãƒ©ãƒ ãŒã‚³ãƒ³ãƒ”ュータ上ã§å‹•ä½œã™ã‚‹åŸºæœ¬åŽŸç†ã¨Java VMã®åŸºæœ¬ç”¨èªžã‚’知ã£ã¦ã„ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚Java VMã®åŸºæœ¬ç”¨èªžã«é–¢ã—ã¦ã¯ã€ã€Œå®Ÿè¡Œã‚¹ãƒ”ードã«æŒ‘戦ã™ã‚‹Javaアーã‚
Javaã®è¬Žã®ãƒ‘フォーマンス劣化ç¾è±¡ã¨ã®æˆ¦ã„ - Cybozu Inside Out | サイボウズエンジニアã®ãƒ–ãƒã‚°
ã“ã‚“ã«ã¡ã¯ã€‚アプリケーション基盤ãƒãƒ¼ãƒ ã®æ¨ªç”°ã§ã™ã€‚ Javaã®è¬Žã®ãƒ‘フォーマンス劣化ã«ã¾ã¤ã‚る調査をã—ã¦ã„ãŸã®ã§ã™ãŒã€1ヶ月ã®è‹¦åŠ´ã®æœ«ã«åŽŸå› ãŒã‚ã‹ã‚Šã¾ã—ãŸã®ã§ã€å ±å‘Šã•ã›ã¦ã„ãŸã ãã¾ã™ï¼ 公開後ã«é ‚ã„ãŸã¯ã¦ãªãƒ–ックマークã§ã®ã”指摘・社内ã§ã®ã‚¿ã‚¤ãƒãƒ»èªã¿ã«ãã„ãªã©ã®æŒ‡æ‘˜ã‚’å—ã‘ã¦ãŸã®ã§ã€è¬¹ã‚“ã§ä¿®æ£ã•ã›ã„ãŸã ãã¾ã™ã€‚ ä¿®æ£ã—ãŸå†…容ã«ã¤ãã¾ã—ã¦ã¯ã€è¨˜äº‹ã®æœ€å¾Œã‚’å‚ç…§ã—ã¦ãã ã•ã„。 å¿™ã—ã„人ã®ãŸã‚ã®ã¾ã¨ã‚ jdk-7u4以é™ã®jdk-7 *1 ã§Javaã®ãƒ‘フォーマンスãŒåŠ£åŒ–ã™ã‚‹è¬Žã®ç¾è±¡ CodeCacheã®å®¹é‡é™ç•Œã«è¿‘ã¥ãã¨JITコンパイラをåœæ¢ã—ã¦ã‚³ãƒ³ãƒ‘イルã—ãŸã‚³ãƒ¼ãƒ‰ã‚’æ¨ã¦ã‚‹æ©Ÿèƒ½ãŒåŽŸå› ã ã£ãŸ 起動オプションã§å›žé¿ã§ãã‚‹ã®ã§ã€é•·æœŸé‹ç”¨ã™ã‚‹ã¨ã㯠-XX:-UseCodeCacheFlushing, -XX:ReservedCodeCacheSize=128m ã‚’ã¤ã‘ã‚‹ 上ã®ã‚ªãƒ—ションをè¨å®šã—ãŸæ™‚ã«ã€C
[調査]JVMã®ã‚¹ã‚¿ãƒƒã‚¯ã‚µã‚¤ã‚ºã«ã¤ã„㦠- Akira's Tech Notes
Table of Contents 1. 環境 2. JVMã®ã‚¹ã‚¿ãƒƒã‚¯é ˜åŸŸã«ã¤ã„㦠3. Javaスレッドã®ã‚¹ã‚¿ãƒƒã‚¯ãƒšãƒ¼ã‚¸æ§‹æˆ 4. HotSpotã®å®Ÿè£… 4.1. glibc guard page 4.2. HotSpot Guard Pages 4.3. Normal Stack 5. スタックサイズã®åˆ¶å¾¡ 6. ulimit -sã®å½±éŸ¿ç¯„囲 7. -Xssã¨-XX:ThreadStackSizeã®é•ã„ 8. å‚考 1 環境 本記事ã®å†…容ã¯ä»¥ä¸‹ç’°å¢ƒã‚’å‰æã¨ã—ã¦ã„ã¾ã™ã€‚ GNU/Linux x86_64 OpenJDK 64-Bit 1.7.0_xx 2 JVMã®ã‚¹ã‚¿ãƒƒã‚¯é ˜åŸŸã«ã¤ã„㦠-Xss 〠-XX:ThreadStackSize パラメータ値㨠ulimit -s リソースリミット制é™å€¤ã‚’æ·· ä¹±ã—ã¦ã„る記事を見å—ã‘ãŸãŸã‚ã€HotSpotã®ä¸èº«ã‚’調ã¹ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ çµè«–ã‚’å…ˆã«ã€
JVM Internals
This article explains the internal architecture of the Java Virtual Machine (JVM). The following diagram show the key internal components of a typical JVM that conforms to The Java Virtual Machine Specification Java SE 7 Edition. The components shown on this diagram are each explained below in two sections. First section covers the components that are created for each thread and the second section
Metaspace in Java 8
In this post, we'll see one of the JVM update i.e, removal of Permanent Generation. Here we'll see why there were need of removal of Permanent Generation and it alternative Metaspace. This is the continuation of previous post on memory management & Garbage collection. This is how Heap Structure look like in Java 6 Permanent Generation The pool containing all the reflective data of the virtual mach
Javaã¯ã©ã®ã‚ˆã†ã«å‹•ãã®ã‹ï½žå›³è§£ã§ã‚ã‹ã‚‹JVMã®ä»•çµ„㿠記事一覧 | gihyo.jp
é‹å–¶å…ƒã®ãƒã‚´ Copyright © 2007-2024 All Rights Reserved by Gijutsu-Hyoron Co., Ltd. ページ内容ã®å…¨éƒ¨ã‚ã‚‹ã„ã¯ä¸€éƒ¨ã‚’ç„¡æ–ã§åˆ©ç”¨ã™ã‚‹ã“ã¨ã‚’ç¦æ¢ã—ã¾ã™â 。個別ã«ãƒ©ã‚¤ã‚»ãƒ³ã‚¹ãŒè¨å®šã•ã‚Œã¦ã„る記事ç‰ã¯ãã®ãƒ©ã‚¤ã‚»ãƒ³ã‚¹ã«å¾“ã„ã¾ã™ã€‚
1
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
{{#tags}}- {{label}}
{{/tags}}