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クラスãƒãƒ¼ãƒ€ãƒªãƒ¼ã‚¯ã¨ãƒ’ープダンプ - n-agetsumaã®æ—¥è¨˜
Java EE を使ã£ã¦ã„る人ãªã‚‰å¤šãã®äººãŒéé‡ã™ã‚‹ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒªãƒ¼ã‚¯ã€‚Eclipseãªã©ã®IDEã§ãƒ›ãƒƒãƒˆãƒ‡ãƒ—ãƒã‚¤ã—ãªãŒã‚‰é–‹ç™ºã—ã¦ã„ã‚‹ã¨ã€çªç„¶APサーãƒã‹ã‚‰å¿œç”ãŒãªããªã£ãŸã‚Šã€java.lang.OutOfMemory : PermGenãŒå‡ºåŠ›ã•ã‚ŒãŸã‚Šã™ã‚‹ã€‚ åŽŸå› ã«ã¤ã„ã¦ã¯nekopã•ã‚“ã®ã‚¹ãƒ©ã‚¤ãƒ‰ã‚„yamadanã•ã‚“ã®ãƒ–ãƒã‚°ã«ç´¹ä»‹ã•ã‚Œã¦ã„ã‚‹ã®ã§ã€ã“ã“ã§ã¯ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒªãƒ¼ã‚¯ã‚’手元ã§å†ç¾ã•ã›ã¦ã¿ã¦ã€ã©ã®ã‚ˆã†ãªãƒ’ープダンプã«ãªã‚‹ã‹ç´¹ä»‹ã™ã‚‹ã€‚ ヒープダンプã®è§£æžã«ã¯EclipseMemoryAnalyzer(MAT)を使ã†ã€‚ 1. Duplicate Classes を確èªã™ã‚‹ クラスãƒãƒ¼ãƒ€ãƒªãƒ¼ã‚¯ãŒç™ºç”Ÿã—ã¦ã„る状æ³ã§ã¯ã€åŒä¸€ã®ã‚¯ãƒ©ã‚¹ãŒç•°ãªã‚‹ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã‚ˆã‚Šãƒãƒ¼ãƒ‰ã•ã‚Œã¦ã„る事象ãŒèµ·ã“ã£ã¦ã„る。MATã§ã¯é‡è¤‡ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ‰ã®ä¸€è¦§ã‚’表示ã™ã‚‹æ©Ÿèƒ½ãŒã‚ã‚‹ãŸã‚ã€1クリックã§ç¢ºèªã§ãる。 Tomcatã®å ´åˆ To
第7回　HotSpot JVMã§ã¯ã©ã®ã‚ˆã†ã«ã‚ªãƒ–ジェクトãŒç§»å‹•ã™ã‚‹ã®ã‹ | gihyo.jp
1回目ã®ãƒžã‚¤ãƒŠãƒ¼GCã¾ã§ã®æµã‚Œã‚’把æ¡ã™ã‚‹ å‰å›žã¯ã€HotSpot JVM（以下HotSpot）ã®ãƒ’ãƒ¼ãƒ—æ§‹é€ ã‚’è§£èª¬ã—ã¾ã—ãŸã€‚今回ã¯ã€HotSpot JVMã®4ã¤ã®ãƒ’ãƒ¼ãƒ—é ˜åŸŸãŒã©ã®ã‚ˆã†ã«ä½¿ç”¨ã•ã‚Œã¦ã„ãã®ã‹ã‚’見ã¦ã„ãã¾ã—ょã†ã€‚ ã¾ãšã€ã‚¢ãƒ—リケーションãŒã‚ªãƒ–ジェクトを作æˆã™ã‚‹ã¨ã€HotSpotã¯ãã®ã‚ªãƒ–ジェクトã«Edené ˜åŸŸã‚’å‰²ã‚Šå½“ã¦ã¾ã™ã€‚ 図1　オブジェクトãŒç”Ÿæˆã•ã‚Œã‚‹ã¨Edené ˜åŸŸãŒå‰²ã‚Šå½“ã¦ã‚‰ã‚Œã‚‹ アプリケーションãŒå‡¦ç†ã‚’実行ã—ã¦ã„ãã¨ã€ã‚ªãƒ–ジェクトãŒã©ã‚“ã©ã‚“作æˆã•ã‚Œã¦ã„ãã¾ã™ã€‚ãã®çµæžœã€Edené ˜åŸŸãŒæ¬¡ã€…ã¨ä½¿ç”¨ã•ã‚Œã¦ã„ãã¾ã™ã€‚ Edené ˜åŸŸãŒã„ã£ã±ã„ã«ãªã‚Šã€ç©ºãé ˜åŸŸãŒãªããªã‚‹ã¨ã€HotSpotã¯Newé ˜åŸŸã‚’å¯¾è±¡ã«GCã‚’è¡Œã„ã¾ã™ã€‚ã“ã®GCã¯ã€Œãƒžã‚¤ãƒŠãƒ¼GCã€ã¨å‘¼ã°ã‚Œã€ä¸–代別GCã§è¨€ã†ã€Œè‹¥ã„世代ã®GCã€ã«ãªã‚Šã¾ã™ã€‚ ã“ã®ã‚ˆã†ã«ã€Edené ˜åŸŸã§çŸå‘½ãªã‚ªãƒ–ジェクトを回åŽã™ã‚‹ã“ã¨ã§ã€ãƒ’ープをå†åˆ©ç”¨ã§ãã‚‹
Java 入門 | JVM ã®ãƒ¡ãƒ¢ãƒªæ§‹é€
Revised: 2nd/Nov./2003; Since: 26th/Jan./2003 データ・エリア JVM ã®ãƒ¡ãƒ¢ãƒªæ§‹é€ ã¯ã€ã‚¹ã‚¿ãƒƒã‚¯ã¨ãƒ’ープã«å¤§åˆ¥ã•ã‚Œã¾ã™ã€‚ヒープ (Heap) 㯠GC ã®å¯¾è±¡ã§ã€JVM 起動時ã«å‰²ã‚Šå½“ã¦ã‚‰ã‚Œã‚‹åºƒå¤§ãªé ˜åŸŸã§ã™ã€‚Java 仮想マシン・スタック (Java Virtual MAchine Stack) ã¯ã‚¹ãƒ¬ãƒƒãƒ‰ã”ã¨ã«å‰²ã‚Šå½“ã¦ã‚‰ã‚Œã‚‹ã€ãƒ¡ã‚½ãƒƒãƒ‰èµ·å‹•ã”ã¨ã«ãƒ•ãƒ¬ãƒ¼ãƒ (Frame) ã¨å‘¼ã°ã‚Œã‚‹ãƒ‡ãƒ¼ã‚¿ã‚’出ã—入れã™ã‚‹ç·šå½¢ã®ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã§ã™ã€‚クラスã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ãªã©ã¯ãƒ’ープã«æ ¼ç´ã—ã¾ã™ãŒã€ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã®ã‚ˆã†ãª GC 対象ã¨ãªã‚‹å‹•çš„ãªãƒ‡ãƒ¼ã‚¿ã¨ã€ã‚¯ãƒ©ã‚¹æ§‹é€ ãªã©ã®é™çš„ãªãƒ‡ãƒ¼ã‚¿ã¯ã€åˆ¥ã®é ˜åŸŸã«ä¿æŒã—ã€é™çš„ãªæ§‹é€ ã‚’ä¿æŒã™ã‚‹é ˜åŸŸã‚’メソッド・エリア (Method Area) ã¨å‘¼ã³ã¾ã™ã€‚ 図：JVM ã®ãƒ¡ãƒ¢ãƒªæ§‹é€ Java 仮想マシン・スタック JVM ã¯ãƒ—ãƒã‚»ã‚¹ã®ä¸€ã¤ã¨ã—ã¦ã€O
GC ãƒã‚°ã«é–¢ã‚ã‚‹ JVM コマンドラインオプションã¾ã¨ã‚ - ç†ç³»å¦ç”Ÿæ—¥è¨˜
Full GC ã«ã‚ˆã‚‹ Stop the World ã§ã‚µãƒ¼ãƒãŒåœæ¢çŠ¶æ…‹ã«â€¦ã€ãã‚“ãªã¨ãã«èª¿æŸ»ã®åŠ©ã‘ã«ãªã‚‹ã®ãŒ GC ã®ãƒã‚°ã€‚Permanent é ˜åŸŸãŒæº¢ã‚Œã¦ã„ã‚‹ã®ã‹ã€Java Heap ãŒæº¢ã‚Œã¦ã„ã‚‹ã®ã‹ã€Heap ãŒæº¢ã‚Œã¦ã„ã‚‹ã®ãªã‚‰ä½•ã®ã‚ªãƒ–ジェクトãŒæº¢ã‚Œã¦ã„ã‚‹ã®ã‹ã€ãƒ¡ãƒ¢ãƒªãƒªãƒ¼ã‚¯ãŒç™ºç”Ÿã—ã¦ã„ã‚‹ã®ã‹ã€‚ãã‚ŒãŒåˆ†ã‹ã‚‰ãªã„ã¨ä½•æ°—ã«å¯¾å‡¦ã®ã—よã†ãŒãªã„。 ãŸã ã€ã“ã® GC ã®ãƒã‚°ã€ãã‚Œãªã‚Šã®è¨å®šã‚’ã—ã¦ãŠã‹ãªã„ã¨è§£æžã«è€ãˆãªã„ã—å½¹ã«ç«‹ãŸãªã„。役ã«ç«‹ãŸãªã„ãƒã‚°å‡ºåŠ›ã¯ãƒ‡ã‚£ã‚¹ã‚¯å®¹é‡ã‚’圧迫ã™ã‚‹ã‚´ãƒŸã«ãªã‚‹ã€‚ãã†ã„ã†æ„Ÿã˜ã®ãƒã‚°ã‚’ç›®ã«ã—ã¦ã€ãªã‚“ã¨ã‹ãªã‚‰ã‚“ã‚‚ã‚“ã‹ãªãƒ¼ã€ãªã‚“ã¨ã‹ã›ãã°ãªãƒ¼ã¨æ¤œè¨Žã—ã¦ãŠã‚Šã€Oracle ã®ãƒšãƒ¼ã‚¸ã‹ã‚‰ãã‚Œã£ã½ã„オプションを調ã¹ã¦ã¿ã¦ã‚‹ã€‚ Java HotSpot VM Options 当然ãªãŒã‚‰ã€ŒOracle ã®ãƒšãƒ¼ã‚¸ã€ã¨æ›¸ã„ã¦ã‚るよã†ã«ã€Oracle ã® JVM ãŒå¯¾è±¡ã§ã‚ã£ã¦ã€ä»–ã® JVM
java memory management & gc
The document discusses Java memory management and garbage collection. It describes the responsibilities of garbage collection as allocating memory, ensuring referenced objects remain in memory, and recovering memory from unreachable objects. It discusses generation collection and the Hotspot memory model with young and old generations. The major garbage collectors are described as serial, parallel
JavaVMã®ãƒ¡ãƒ¢ãƒªç®¡ç†ã«é–¢ã™ã‚‹ã¾ã¨ã‚（Javaヒープã€GCã€ãƒ€ãƒ³ãƒ—ç‰ï¼‰ - ãºãƒ¼ãºãƒ¼SEã®ãƒ–ãƒã‚°
本ブãƒã‚°ã¯Java8（特ã«Metaspace）ã«å¯¾å¿œã—ã¦ã„ãªã„。 下記ã«Java8以é™ã«å¯¾å¿œã—ãŸè¨˜äº‹ã‚’記載ã™ã‚‹ï¼ˆäºˆå®šï¼‰ã€‚ blog.pepese.com JavaVMã®ãƒ¡ãƒ¢ãƒªé ˜åŸŸã«ã¤ã„㦠JavaVMãŒç®¡ç†ã™ã‚‹ãƒ¡ãƒ¢ãƒªé ˜åŸŸã«ã¤ã„㦠階層1 階層2 階層3 説明 Javaヒープ JavaVM上ã§èµ·å‹•ã™ã‚‹Javaプãƒã‚°ãƒ©ãƒ ã®ãƒªã‚½ãƒ¼ã‚¹ã‚’管ç†ã™ã‚‹é ˜åŸŸã€‚Newé ˜åŸŸã¨Oldé ˜åŸŸã§æ§‹æˆã•ã‚Œã‚‹ã€‚ ｌ" Newé ˜åŸŸ æ–°è¦ã‚ªãƒ–ジェクトã¨é–¾å€¤ï¼ˆ-XX:MaxTenuringThreshold）未満ã®ã‚ªãƒ–ジェクトãŒé…ç½®ã•ã‚Œã‚‹ã€‚（Youngé ˜åŸŸã¨ã‚‚呼ã°ã‚Œã‚‹ï¼‰ ｌ ｌ" Edené ˜åŸŸ æ–°è¦ã®ã‚ªãƒ–ジェクトãŒé…ç½®ã•ã‚Œã‚‹ã€‚ ｌ ｌ" Fromé ˜åŸŸ CopyGC(ScavengeGCã€ãƒžã‚¤ãƒŠãƒ¼GC)ãŒå®Ÿè¡Œã•ã‚ŒãŸéš›ã«ã€ä½¿ç”¨ä¸ã®ã‚ªãƒ–ジェクトã¯ã“ã“ã¸ã‚³ãƒ”ーã•ã‚Œã‚‹ã€‚（S0ã‚„S1ã¨ã‚‚呼ã°ã‚Œã‚‹ï¼‰ ｌ ｌー Toé ˜åŸŸ CopyGC(Scav
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?
Memory usage comparison of Java Application Servers and Applications
Memory usage comparison of Java Application Servers and Applications How much memory related resources you will need to run a Java application server or a Java application within Java Virtual Machine? To give you an estimate we tested some popular ones and are publishing results below. The survey will be updated as needed. As you start to access your application the memory usage will grow as dynam
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GitHub - jbellis/jamm: Java Agent for Memory Measurements
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