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jvmã«é–¢ã™ã‚‹learnã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (87)

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Javaã®ã‚³ãƒ³ãƒ†ãƒŠã®ãƒ¡ãƒ¢ãƒªå‰²ã‚Šå½“ã¦ã®è€ƒãˆæ–¹ã‚’ã¾ãã•ã‚“ã«æ•™ãˆã¦ã„ãŸã ã„ãŸã®ã§è¨˜éŒ² - Mitsuyuki.Shiiba
ä½•åº¦ã‹æ•™ãˆã¦ã„ãŸã ã„ã¦ã„ã‚‹ã®ã§ã€ä»Šåº¦ã“ãã—ã£ã‹ã‚Šè¦šãˆã¦ãŠããŸãã¦ã€ã¾ãã•ã‚“ã‹ã‚‰ã®ã‚³ãƒ¡ãƒ³ãƒˆã‚’è¨˜éŒ²ã€‚ ## ãƒ¡ãƒ¢ãƒªã‚µã‚¤ã‚ºã®è€ƒãˆæ–¹ SpringBootã®ã‚¢ãƒ—ãƒªã‚’ã‚³ãƒ³ãƒ†ãƒŠã¨ã—ã¦å‹•ã‹ã™å ´åˆã«ã¯768MBä»¥ä¸Šå¿…è¦ã§ã€1GBãã‚‰ã„ã¯å‰²ã‚Šå½“ã¦ã‚‹å¿…è¦ãŒã‚ã‚‹ã®ã§ã¯ãªã„ã‹ã¨ã„ã†åƒ•ã®ã‚³ãƒ¡ãƒ³ãƒˆã«å¯¾ã—ã¦ã„ãŸã ã„ãŸã‚³ãƒ¡ãƒ³ãƒˆã€‚ ãã‚Œã¯ä¸æ£ç¢º..Tomcatã‚’ä½¿ã†å ´åˆã¯æœ€å¤§ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³(ã‚¹ãƒ¬ãƒƒãƒ‰)ãŒãƒ‡ãƒ•ã‚©ãƒ«ãƒˆ200ã§+50ã‚¹ãƒ¬ãƒƒãƒ‰ãã‚‰ã„ä½™è£•ã‚’è¦‹ã‚‹ã¨250M (-Xss1Mï¼‰ã§ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã®ReservervedCodeCacheSize 240Mã¨DirectMemorySize 10MåŠ ãˆãŸä¸Šã«MaxMetaSpaceSizeãŒã–ã£ãã‚Š50Mãã‚‰ã„è¶³ã™ã¨550Mãã‚‰ã„ä½¿ã£ã¦ã“ã‚ŒHeapã‚’è¶³ã™ã¨ã‚³ãƒ³ãƒ†ãƒŠã‚µã‚¤ã‚ºâ€” Toshiaki Maki (@making) November 16, 2019 ãã®å‰æã§ã‚ã‚Œã°Heap 2
learn 2019/11/19
JVM

ãƒ¡ãƒ¢ãƒª

Docker
ãƒªãƒ³ã‚¯
Unified JVM Logging
3. ãŠã‚„ããã! â€¢â€¯æœ¬ã‚»ãƒƒã‚·ãƒ§ãƒ³ (ã‚¹ãƒ©ã‚¤ãƒ‰) ã¯ã€ ä»¥ä¸‹ã® JVM å®Ÿè£…ã«åŸºã¥ãã¾ã™ â€“â€¯OpenJDK 9 EA b170 (HotSpot VM) â€“â€¯jdk9/jdk9/hotspot 12762:b3ee8ab233ed EA = Early Accessã€‚æ£å¼ãƒªãƒªãƒ¼ã‚¹å‰ã®ãƒã‚¤ãƒŠãƒª CopyrightÂ©2017 NTT corp. All Rights Reserved.+ 3! $ java -version java version "9-ea" Java(TM) SE Runtime Environment (build 9-ea+170) Java HotSpot(TM) 64-Bit Server VM (build 9-ea+170, mixed mode)+
learn 2019/06/12
jvm

GC
ãƒªãƒ³ã‚¯
43 GC LOGGING FLAGS REMOVED IN JAVA 9
In Java 9, GC logging has been re-implemented with Unified GC logging framework (JEP 271).Â This initiative is targeted to introduce a common logging systemÂ for all components of JVM (compiler, gc, classload, metaspace, svc, jfr, â€¦). As a part of this re-implementation, 43 GC logging flags have been removed. Yes, they are removed, not even deprecated. JVM will not start if old GC flags are passed.
learn 2019/06/12
jvm

GC
ãƒªãƒ³ã‚¯
VM Options Explorer - OpenJDK11 HotSpot
Hey Reader! If these notes float your boat you'll find more great JVM info in this book I co-wrote! Optimizing Java: Practical techniques for improving JVM application performance NameSinceDeprecatedTypeOSCPUComponentDefaultAvailabilityDescriptionDefined in SinceDeprecatedTypeOSCPUComponentAvailability
learn 2019/06/09
jvm
ãƒªãƒ³ã‚¯
Sparkã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®ãŸã‚ã®Javaã‚¬ãƒ™ãƒ¼ã‚¸ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«ã¤ã„ã¦ - TEPPEI STUDIO
ã“ã®è¨˜äº‹ã¯ã€ã‚¤ãƒ³ãƒ†ãƒ«ã® SSG STOãƒ“ãƒƒã‚°ãƒ‡ãƒ¼ã‚¿ãƒ†ã‚¯ãƒŽãƒã‚¸ãƒ¼ã‚°ãƒ«ãƒ¼ãƒ—ã®ãƒ¡ãƒ³ãƒãƒ¼ã‹ã‚‰DataBricksã«å¯„ç¨¿ã•ã‚ŒãŸãƒ–ãƒã‚°ã‚’ç¿»è¨³ã—ãŸã‚‚ã®ã§ã™ã€‚èª¤è¨³ãŒã‚ã‚Šã¾ã—ãŸã‚‰ã€@teppei_tosaã«å¾¡é€£çµ¡ãã ã•ã„ã€‚ Sparkã¯ã€ãã®å„ªã‚ŒãŸæ€§èƒ½ã€ã‚·ãƒ³ãƒ—ãƒ«ãªã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ã‚¤ã‚¹ã€ãŠã‚ˆã³åˆ†æžã‚„è¨ˆç®—ã®ãŸã‚ã®è±Šå¯Œãªãƒ©ã‚¤ãƒ–ãƒ©ãƒªã«ã‚ˆã£ã¦ã€å¹…åºƒã„æ¥ç•Œã§æŽ¡ç”¨ã•ã‚Œã¦ãã¦ã„ã¾ã™ã€‚ãƒ“ãƒƒã‚°ãƒ‡ãƒ¼ã‚¿ã‚¨ã‚³ã‚·ã‚¹ãƒ†ãƒ ã«ãŠã‘ã‚‹å¤šãã®ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã¨åŒæ§˜ã«ã€Sparkã¯ã€Javaä»®æƒ³ãƒžã‚·ãƒ³ï¼ˆJVMï¼‰ä¸Šã§å®Ÿè¡Œã•ã‚Œã¾ã™ã€‚Sparkã¯ãƒ¡ãƒ¢ãƒªã«å¤§é‡ã®ãƒ‡ãƒ¼ã‚¿ã‚’æ ¼ç´ã™ã‚‹ã“ã¨ã«ãŠã„ã¦ã€Javaã®ãƒ¡ãƒ¢ãƒªç®¡ç†ã¨ã‚¬ãƒ™ãƒ¼ã‚¸ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ï¼ˆGCï¼‰ã«å¤§ããé ¼ã£ã¦ã„ã¾ã™ã€‚ã¾ãŸã€ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆTungstenãªã©ã®æ–°ãŸãªå–ã‚Šçµ„ã¿ã¯ã€å°†æ¥ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã€ãƒ¡ãƒ¢ãƒªç®¡ç†ã®ã•ã‚‰ãªã‚‹ç°¡ç´ åŒ–ã¨æœ€é©åŒ–ã‚’ç›®æŒ‡ã—ã¦ã„ã¾ã™ã€‚ã—ã‹ã—ã€ä»Šæ—¥æ™‚ç‚¹ã§ã‚‚ã€Javaã®GCã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¨ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã‚’ç†è§£ã—ã¦ã„ã‚‹ãƒ¦
learn 2019/06/09
jvm

GC

G1GC

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ãƒªãƒ³ã‚¯
JVMã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚’é‹ç”¨ã™ã‚‹éš›ã®ãƒ¡ã‚¸ãƒ£ãƒ¼ã©ã“ã‚ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ãƒã‚¤ãƒ³ãƒˆãƒ¡ãƒ¢ - yoskhdiaâ€™s diary
JVMã«ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°é …ç›®ã¯å¤šã€…ã‚ã‚Œã©ã€ãƒ—ãƒãƒ€ã‚¯ã‚·ãƒ§ãƒ³ã§é‹ç”¨ã™ã‚‹éš›ã«äºˆã‚ãŠã•ãˆã¦ãŠããŸã„é …ç›®ã‚’ã¾ã¨ã‚ã¦ã¿ã‚‹ã‚¨ãƒ³ãƒˆãƒªã§ã™ã€‚*1 å‹¿è«–ã€OSã‚‚JVMã‚‚ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã§ã‚ã‚‹ç¨‹åº¦ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã¯ç™ºæ®ã§ãã€è¨ˆæ¸¬ã‚’ä¼´ã‚ãªã„ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¯æ‚ªæ‰‹ã§ã‚ã‚‹ã“ã¨ã¯ã‚ˆãçŸ¥ã‚‰ã‚Œã¦ã„ã¾ã™ã€‚ ã—ã‹ã—ã€è¨å®šã—ã¦ãŠã‹ãªã„ã¨ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã«ãã®ã¾ã¾å½±éŸ¿ã™ã‚‹ã¨åˆ†ã‹ã‚‹ã‚‚ã®ã‚’èª¿ã¹ãªã„ã®ã¯è£¸ã§æˆ¦å ´ã«èµ´ãã‚ˆã†ãªã‚‚ã®ã§ã™ã€‚*2 ã©ã‚“ãªé …ç›®ã‚’ã©ã†å¤‰æ›´ã™ã‚Œã°è‰¯ã„ã®ã‹çŸ¥ã£ã¦ã„ã‚‹ã“ã¨ã¯é‡è¦ãªæ¦å™¨ãªã®ã§ã™ã€‚ ãªãœèª¿ã¹ã‚‹ã®ã‹ ä»Šå›žã€ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ãƒã‚¤ãƒ³ãƒˆã‚’èª¿ã¹ã‚‹ã«ã‚ãŸã£ã¦ã€ç§ã®ãƒ¢ãƒãƒ™ãƒ¼ã‚·ãƒ§ãƒ³ã¯ã©ã“ã«ã‚ã‚‹ã®ã‹ã‚’è€ƒãˆã‚‹ã¨ã€ä»¥ä¸‹ã®è¦ä»¶ã‚’æº€ãŸã—ãŸã„ã¨ã„ã†ã“ã¨ãŒã‚ã’ã‚‰ã‚Œã¾ã™ã€‚ ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¨ã—ã¦æ±‚ã‚ã‚‰ã‚Œã‚‹å“è³ªæ°´æº–ã¨ã—ã¦å‹•ä½œã™ã‚‹ â†’ æ€§èƒ½ç›®æ¨™ ç•°å¸¸æ™‚ã«äº‹è±¡ã‚’è¿½ã†ã“ã¨ãŒã§ãã‚‹ ã“ã“ã§ã„ã†å“è³ªæ°´æº–ãƒ»ç•°å¸¸ã¨ã¯ã€ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãŒæ˜Žã‚‰ã‹ã«ä½Žã„ã€ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãŒã‚¯ãƒ©ãƒƒã‚·ãƒ¥ã™
learn 2019/06/09
jvm

linux

ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãƒãƒ¥ãƒ¼

GC
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å…ƒè¨˜äº‹æœ€çµ‚æ›´æ–°ï¼š2007/04/19 æ¦‚è¦ Sun Java VMã«å«ã¾ã‚Œã‚‹ã€HotSpot Servet VMã§ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚’å®Ÿè¡Œã™ã‚‹éš›ã€ãŸã¾ã«ä¾‹å¤–ã®ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ãŒçœç•¥ã•ã‚Œã¦ã—ã¾ã†ä»¶ã«é–¢ã—ã¦è¨˜è¿°ã€‚ ç¾è±¡ Sun Java SE 1.4.1_08 ã®HostSpot Server VMã§ç¢ºèªã€‚ åŒã˜ç®‡æ‰€ç¹°ã‚Šè¿”ã—NullPointerExceptionã‚’ç™ºç”Ÿã™ã‚‹ã‚³ãƒ¼ãƒ‰ãŒã‚ã£ãŸéš›ã€ä½•åº¦ç›®ã‹ã®ä¾‹å¤–ç™ºç”Ÿå¾Œã€NullPointerExcetpionã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ãŒå«ã¾ã‚Œãªããªã£ãŸã€‚ ã“ã®ãŸã‚ã€ä¾‹å¤–ç™ºç”Ÿæ™‚ã®åŽŸå› ç‰¹å®šãŒå›°é›£ã¨ãªã£ã¦ã—ã¾ã£ãŸã€‚ åŽŸå› HotSpotVMã¯ã€å®Ÿè¡Œæ™‚æœ€é©åŒ–ã®ä¸€ç’°ã¨ã—ã¦ã€ç¹°ã‚Šè¿”ã—å‡ºåŠ›ã•ã‚Œã‚‹ä¸€éƒ¨ã®çµ„ã¿è¾¼ã¿ä¾‹å¤–ã«ã¤ã„ã¦ã¯ã€éƒ½åº¦ä¾‹å¤–ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚’ç”Ÿæˆã›ãšã€åŒã˜ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚’ä½¿ã„å›žã™ã“ã¨ã«ã‚ˆã£ã¦ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ç”Ÿæˆã‚³ã‚¹ãƒˆã‚’æŠ‘ãˆã‚‹ã¨ã„ã†å‡¦ç†ã‚’è¡Œã£ã¦ã„ã‚‹ã€‚ ã“ã®ä½¿ã„ã¾ã‚ã•
learn 2019/06/08
jvm

ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°
ãƒªãƒ³ã‚¯
Web Application Server ã‚’å‹•ã‹ã™æ™‚ã® Java8 èµ·å‹•ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã®ãƒ¡ãƒ¢ - ãã®æ‰‹ã®å¹³ã¯å°»ã‚‚ã¤ã‹ã‚ã‚‹ã•
ä¸€èˆ¬çš„ãª Web Application Server *1 ã‚’ Java8 ã§å‹•ã‹ã™ã«ã‚ãŸã£ã¦ï¼Œæœ€è¿‘æœ‰åŠ¹ã«ã—ã¦ã„ã‚‹èµ·å‹•ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã«ã¤ã„ã¦ãƒ¡ãƒ¢ï¼Ž ä½•ã‹é–“é•ã£ã¦ã„ãŸã‚Šï¼Œã‚ã‚‹ã„ã¯ã€Œã“ã£ã¡ã®æ–¹ãŒè‰¯ã„ã€ã¿ãŸã„ãªã®ãŒã‚ã‚Œã°æ•™ãˆã¦ä¸‹ã•ã„ï¼Ž -server server mode ã§èµ·å‹•ã•ã›ã‚‹ (æŒ‡å®šã—ãªã„ã¨ client mode ã«ãªã‚‹å¯èƒ½æ€§ãŒã‚ã‚‹ï¼Œãƒžã‚·ãƒ³ã‚¹ãƒšãƒƒã‚¯ã«ã‚ˆã£ã¦ã‚¹ã‚¤ãƒƒãƒã™ã‚‹ï¼Ÿ)ï¼Ž -Djava.net.preferIPv4Stack=true If IPv6 is available on the operating system the underlying native socket will be an IPv6 socket. This allows Java(tm) applications to connect too, and accept connections from,
learn 2017/02/26
jvm

java8

GC

ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°
ãƒªãƒ³ã‚¯
Javaã®è¬Žã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹åŠ£åŒ–ç¾è±¡ã¨ã®æˆ¦ã„ - Cybozu Inside Out | ã‚µã‚¤ãƒœã‚¦ã‚ºã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®ãƒ–ãƒã‚°
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learn 2016/04/14
jvm

ãƒˆãƒ©ãƒ–ãƒ«ã‚·ãƒ¥ãƒ¼ãƒ†ã‚£ãƒ³

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JDK8(Linux 64bit)ã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚º - n-agetsumaã®æ—¥è¨˜
Oracleã®å…¬å¼ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆã«ã¯ã€-XmxãŒæœªæŒ‡å®šã§ã‚ã£ãŸå ´åˆã®ã‚¨ãƒ«ã‚´ãƒŽãƒŸã‚¯ã‚¹ã«ã‚ˆã‚‹æœ€å¤§ãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚ºã¯ã€Ž32GBã‚’ä¸Šé™ã¨ã—ã¦ã€ç‰©ç†ãƒ¡ãƒ¢ãƒªã®4åˆ†ã®1ã€æ›¸ã‹ã‚Œã¦ã„ã‚‹ã€‚32GBã¯-XX:-UseCompressedOopsã«ã‚ˆã‚Šåœ§ç¸®Oopã‚’æ˜Žç¤ºçš„ã«ç„¡åŠ¹ã«ã—ãŸå ´åˆã®æœ€å¤§ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚ºã§ã€ä½•ã‚‚ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’ä»˜ã‘ãšã«èµ·å‹•ã—ãŸå ´åˆã¯29GBãŒä¸Šé™ã€‚ ãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚ºã®æ±ºå®šã¯arguments.cppã®Arguments::set_heap_size()ã§è¨ˆç®—ã•ã‚Œã¦ã„ã‚‹ã€‚ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã®æœ€å¤§ãŠã‚ˆã³åˆæœŸãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚ºã¯ã€ç‰©ç†ãƒ¡ãƒ¢ãƒªé‡ã«ã‚ˆã‚Šç•°ãªã‚‹ã€‚ ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆæœ€å¤§ãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚º(-Xmx) ç‰©ç†ãƒ¡ãƒ¢ãƒªãŒ248MBä»¥ä¸‹ã®å ´åˆ ç‰©ç†ãƒ¡ãƒ¢ãƒªã®2åˆ†ã®1ã€‚ 248MBã¯-XX:MaxHeapSize(ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆ124MB) x -XX:MinRAMFraction(ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆ2)ã®å€¤ã€‚ ç‰©ç†ãƒ¡ãƒ¢ãƒªãŒ248MBã‚ˆã‚Šå¤§ãã„å ´åˆ
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GitHub - LinkedInAttic/JTune: A high precision Java CMS optimizer
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learn 2015/07/03
jvm

GC

ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãƒãƒ¥ãƒ¼

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Javaãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚¢ãƒƒãƒ—æ™‚ã®éžäº’æ›ã«ã‚ˆã‚‹ãƒˆãƒ©ãƒ–ãƒ«äº‹ä¾‹ã‚„Metaspaceã®è§£æž

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java8

jvm

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ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚¢ãƒƒãƒ—

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learn 2015/02/04
Cãƒ’ãƒ¼ãƒ—ã®ãƒªãƒ¼ã‚¯ã‚’gcoreã¨stringsã§è§£æž

jvm

ãƒ¡ãƒ¢ãƒª

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Java: æœ¬ç•ªç’°å¢ƒã§ã®ãƒ‡ãƒãƒƒã‚°ã‚¹ã‚ãƒ«ã‚’ç£¨ã - ãƒ¯ã‚¶ãƒŽãƒ | wazanova
https://www.youtube.com/watch?v=7KS4L-mA_-c 1 comment | 0 points | by WazanovaNews â– comment by Jshiike | ç´„1æ™‚é–“å‰ Takipi ã®Founderã§ã‚ã‚‹TalWeissã®San Francisco Java User GroupãƒŸãƒ¼ãƒˆã‚¢ãƒƒãƒ—ã§ã®è¬›æ¼”ã€‚æœ¬ç•ªç’°å¢ƒã§å½¹ã«ç«‹ã¤ãƒ‡ãƒãƒƒã‚°ãƒ†ã‚¯ãƒ‹ãƒƒã‚¯ã®ç´¹ä»‹ã§ã™ã€‚ 1. ã‚¹ãƒ¬ãƒƒãƒ‰åã®æ´»ç”¨ ã‚¹ãƒ¬ãƒƒãƒ‰åã¯mutableï¼ˆEJBé™¤ãï¼‰ã§ã‚ã‚‹ã€‚ã‚³ãƒ¼ãƒ‰ã®ã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆã«ã‚ã‚ã›ã¦ã€Thread.currentThread().setName(Context, TID, Params, Time,...);ã®ã‚ˆã†ã«ã™ã‚Œã°ã€ãƒˆãƒ©ãƒ³ã‚¶ã‚¯ã‚·ãƒ§ãƒ³IDã€Serveletãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã€ã‚ãƒ¥ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸IDã€èµ·å‹•æ™‚é–“ãªã©ã€ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã«å½¹ã«ç«‹ã¤æƒ…å ±ã‚’è¡¨ç¤ºã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ã€‚ J
learn 2015/01/20
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â€»ï¼šã“ã®è¨˜äº‹ã¯ä¸‹æ›¸ãä¸ã«æœ¬æ–‡ãŒãŒã£ã¤ã‚Šæ¶ˆãˆãŸãŸã‚ã€çŸ¥ã‚‰ãšã«éƒ¨åˆ†çš„ã«ç«¯æŠ˜ã£ã¦ã‚‹ã¨ã“ã‚ãŒã‚ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ã€‚(Â´ï¼›Ï‰ï¼›`) Javaã€ã™ãªã‚ã¡ JVM (HotSpot) ã‚’ç«‹ã¡ä¸Šã’ãŸæ™‚ã€ã©ã†ã„ã£ãŸå‡¦ç†ãŒè¡Œã‚ã‚Œã¦ã„ã‚‹ã®ã§ã—ã‚‡ã†ã‹ã€‚æ£ç¢ºã«çŸ¥ã‚ŠãŸã„å ´åˆã¯ OpenJDK ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’èªã‚€ã®ãŒæœ€ã‚‚ç¢ºå®Ÿã§ã™ãŒã€æ¦‚è¦ãƒ¬ãƒ™ãƒ«ã§ã©ã®ã‚ˆã†ãªå‡¦ç†ãŒè¡Œã‚ã‚Œã¦ã„ã¦ã€ãã‚ŒãŒã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã®ã©ã®ã‚ãŸã‚Šã«æ›¸ã‹ã‚Œã¦ã„ã‚‹ã®ã‹æ¡ˆå†…ãŒã‚ã£ãŸæ–¹ãŒã™ã‚“ãªã‚Šã¨ç†è§£ã§ãã¾ã™ã€‚ã¨è¨€ã†ã‚ã‘ã§ã€è‡ªåˆ†ç”¨ã®ãƒ¡ãƒ¢æ›¸ãã‚’ã¡ã‚‡ã£ã¨ã ã‘æ•´ç†ã—ã¦ã“ã“ã§å…¬é–‹ã—ã¦ã¿ã¾ã™ã€‚ ãªãŠã€è‡ªåˆ†ã®ç†è§£ã‚’ãƒ™ãƒ¼ã‚¹ã«è¨˜è¿°ã—ã¦ã„ã‚‹ã®ã§é–“é•ã„ãŒå«ã¾ã‚Œã¦ã„ã‚‹å¯èƒ½æ€§ãŒã‚ã‚Šã¾ã™ã€‚è¦‹ã¤ã‘ãŸå ´åˆã¯ãã£ã¨ã‚³ãƒ¡ãƒ³ãƒˆã‹ @sugarlife ã«ãŠæ•™ãˆé ‚ã‘ã‚‹ã¨å¤§å¤‰å–œã³ã¾ã™ã€‚ Java ã®å‹•ä½œæ¦‚è¦ã«ã¤ã„ã¦ Javaã€ç‰¹ã« HotSpot ã®å‹•ä½œæ¦‚è¦ã«ã¤ã„ã¦ã¯ã€OpenJDK ã‚³ãƒŸãƒ¥ãƒ‹ãƒ†ã‚£ã«ã‚ˆã£ã¦ã€ŒH
learn 2014/11/09
jvm
ãƒªãƒ³ã‚¯
hotspot-runtime-overview_translated
ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³å¼•æ•°ã®å‡¦ç† VMã®ãƒ©ã‚¤ãƒ•ã‚µã‚¤ã‚¯ãƒ« VMã®ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ‡ã‚£ãƒ³ã‚° ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã®æ¤œè¨¼ã¨ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆãƒã‚§ãƒƒã‚¯ ã‚¯ãƒ©ã‚¹ãƒ‡ãƒ¼ã‚¿ã‚·ã‚§ã‚¢ãƒªãƒ³ã‚° (æœªç¿»è¨³) ã‚¤ãƒ³ã‚¿ãƒ—ãƒªã‚¿ (æœªç¿»è¨³) Javaã®ä¾‹å¤–å‡¦ç† (æœªç¿»è¨³) åŒæœŸåŒ–(Synchronization) (æœªç¿»è¨³) ã‚¹ãƒ¬ãƒƒãƒ‰ç®¡ç† (æœªç¿»è¨³) C++ãƒ’ãƒ¼ãƒ—ç®¡ç† (æœªç¿»è¨³) Java Native Interface (JNI) (æœªç¿»è¨³) VMã®è‡´å‘½çš„ãªä¾‹å¤–å‡¦ç† (æœªç¿»è¨³) å‚è€ƒ (æœªç¿»è¨³) ã•ã‚‰ã«èªã¿é€²ã‚ã‚‹ãŸã‚ã« (æœªç¿»è¨³) Java HotSpotä»®æƒ³ãƒžã‚·ãƒ³ã®æ€§èƒ½ã«å½±éŸ¿ã‚’ä¸Žãˆã‚‹ãŸãã•ã‚“ã®ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³å¼•æ•°ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚„ç’°å¢ƒå¤‰æ•°ãŒã‚ã‚Šã¾ã™ã€‚ã“ã‚Œã‚‰ã®ä¸ã®ã„ãã¤ã‹ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯ãƒ©ãƒ³ãƒãƒ£ã«ã‚ˆã£ã¦ä½¿ç”¨ã•ã‚Œã‚‹ã‚‚ã® (ä¾‹ãˆã° `-server` ã‚„ `-client`) ã‚„ã€ã„ãã¤ã‹ã¯ãƒ©ãƒ³ãƒãƒ£ã«ã‚ˆã£ã¦å‡¦ç†ã•ã‚ŒJVMã«æ¸¡ã•ã‚Œã¾ã™ãŒã€ã»ã¨ã‚“ã©ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯ç›´
learn 2014/11/09
jvm
ãƒªãƒ³ã‚¯
Jvm internal
2. Java 8 HotSpotMeeting è‡ªå·±ç´¹ä»‹ COPYRIGHT 2014 PLUGRAM, INC. @tan_go238 PLUGRAM, Inc. 14å¹´10æœˆ23æ—¥æœ¨æ›œæ—¥2 3. Java 8 HotSpotMeeting ã‚‚ãã˜ ãƒ»ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³å¼•æ•° ãƒ»OOPã¨ã‹ ãƒ»Object Locking ãƒ»Compressed OOP ãƒ»Java8ã§ã®å¤‰æ›´ç‚¹ COPYRIGHT 2014 PLUGRAM, INC. 14å¹´10æœˆ23æ—¥æœ¨æ›œæ—¥3
learn 2014/10/25
jvm

java8
ãƒªãƒ³ã‚¯
Java 8 ã®ãƒ’ãƒ¼ãƒ—ãƒ¢ãƒ‹ã‚¿ãƒªãƒ³ã‚°
Presentation Slides at Java 8 HotSpot meeting http://kanjava.connpass.com/event/8860/
learn 2014/10/25
jvm

java8

ãƒ¡ãƒ¢ãƒª

jolokia
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JDK8ã‹ã‚‰ã‚ã‚‹ã¡ã‚‡ã£ã¨å¬‰ã—ã„GCãƒã‚°ã‚ªãƒ—ã‚·ãƒ§ãƒ³ - n-agetsumaã®æ—¥è¨˜
JDK8ãŠã‚ˆã³JDK8u20ã§ã¯ã€GCãƒã‚°ã«é–¢é€£ã™ã‚‹2ã¤ã®ä¾¿åˆ©ãªæ©Ÿèƒ½ãŒè¿½åŠ ã•ã‚Œã¦ã„ã‚‹ã€‚ã„ãšã‚Œã®æ©Ÿèƒ½ã‚‚2014/8ç¾åœ¨æœ€æ–°ã®JDK7 update 67 ã«ã¯å«ã¾ã‚Œã¦ã„ãªã„ãŒã€JDK7u80ã«ã¦ãƒãƒƒã‚¯ãƒãƒ¼ãƒˆã•ã‚Œã‚‹äºˆå®šã€‚ GCãƒã‚°ã«pidã¨æ—¥ä»˜ã‚’å«ã‚ã‚‹ (JDK8ã‚ˆã‚Š) JAVA_OPTS="$JAVA_OPTS -Xloggc:/var/log/wildfly/gc_%p_%t.log" => å®Ÿéš›ã®ãƒ•ã‚¡ã‚¤ãƒ«åä¾‹ : gc_pid31455_2014-08-31_14-20-16.log.0GCãƒã‚°ã®ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã«%pã‚’å…¥ã‚Œã‚‹ã¨pidå½¢å¼ã®ãƒ—ãƒã‚»ã‚¹IDãŒä»˜ä¸Žã•ã‚Œã‚‹ã€‚ã¾ãŸ%tã‚’ä»˜ä¸Žã™ã‚‹ã¨"_2014-08-31_14-20-16"ã®ã‚ˆã†ã«GCãƒã‚°ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ä½œæˆã—ãŸæ—¥ä»˜æ™‚åˆ†ç§’ãŒè¿½åŠ ã•ã‚Œã‚‹ã€‚ã‹ã¤ã¦GCãƒã‚°ã¯Javaã‚’å†èµ·å‹•ã™ã‚‹ã¨åŒã˜ãƒ•ã‚¡ã‚¤ãƒ«ãŒä¸Šæ›¸ãã•ã‚Œã¦æ¶ˆãˆã¦ã—ã¾ã†ãŸã‚ã€å‡ºåŠ›å…ˆã‚’-Xloggc:g
learn 2014/09/01
jvm

jcmd

GC

ãƒã‚°

é‹ç”¨
ãƒªãƒ³ã‚¯
https://blogs.oracle.com/poonam/understanding-g1-gc-logs
learn 2014/08/31
jvm

GC

G1GC
ãƒªãƒ³ã‚¯
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