[B! JVM] akira1908jpã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

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akira1908jp 2020/09/03
java

JVM

API

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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
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akira1908jp 2019/11/18
ã‚³ãƒ³ãƒ†ãƒŠ

ãƒ¡ãƒ¢ãƒª

JVM
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ãƒ©ãƒ ãƒ€ã¯åŒ¿åã‚¯ãƒ©ã‚¹ã®ã‚·ãƒ³ã‚¿ãƒƒã‚¯ã‚¹ã‚·ãƒ¥ã‚¬ãƒ¼ã ã¨ã‹è¨€ã‚ã‚Œã¾ã™ã‘ã©ã€ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã®ä½œã‚‰ã‚Œæ–¹ãŒé•ã„ã¾ã™ãã€‚ ã¨ã„ã†ã®ã‚’æ¤œè¨¼ã—ã¦ã¿ã¾ã™ã€‚ (jdk1.8.0_112ã§å‹•ã‹ã—ã¦ã„ã¾ã™) ãƒ«ãƒ¼ãƒ—ã®ä¸ã§hogeã«ãƒ©ãƒ ãƒ€ã‚’æ¸¡ã—ã¦ã€hogeã§ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’è¡¨ç¤ºã—ã¾ã™ã€‚ ã¾ãšåŒ¿åã‚¯ãƒ©ã‚¹ã‚’ä½¿ã£ãŸã‚³ãƒ¼ãƒ‰ã€‚ public class LambdaObj { public static void main(String[] args) { for (int i = 0; i < 2; ++i) { hoge(new Runnable() { @Override public void run() { } }); } } static void hoge(Runnable r) { System.out.println(r); } } å®Ÿè¡Œã™ã‚‹ã¨ã“ã†ã€‚ myproject.LambdaObj$1@15db9742 myp
akira1908jp 2017/06/09
ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆ

java

jvm

lambda
ãƒªãƒ³ã‚¯
JVM ã«ãŠã‘ã‚‹ãƒ¡ãƒ¢ãƒªåŠ¹çŽ‡ã®è‰¯ã„æœ«å°¾å†å¸°æœ€é©åŒ–ã®å®Ÿè£…ã®ç´¹ä»‹ - ã‚ã˜ã‹ã‚‹ã‚“ã‚‹ã‚“ã‚‚ã®ãŒãŸã‚Š
ã‚„ã‚ã‚„ã‚ç—…äººã§ã™ã€‚ä»Šæ—¥ã¯ç‰¹ã«äºˆå®šã‚‚ãªã„ã®ã§ã€æœ€è¿‘èªã‚“ã è«–æ–‡ã®ä¸ã‹ã‚‰ã€é©å½“ã«ã„ãã¤ã‹ãƒ”ãƒƒã‚¯ã‚¢ãƒƒãƒ—ã—ã¦ç´¹ä»‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ Memory-efficient Tail Calls in the JVM with Imperative Functional Objects JVM ã«ãŠã‘ã‚‹ TCE(Tail Call Elimination) ã«ã¤ã„ã¦ã¯ã€é•·ã„é–“ç ”ç©¶ã•ã‚Œã¦ãã¦ã„ã¾ã™ã€‚å…å¹´å‰ã« JVM ã§ã® TCE ã«ã¤ã„ã¦ã® Odersky å…ˆç”Ÿã®è«–æ–‡ã‚’ç´¹ä»‹ã™ã‚‹è¨˜äº‹ã‚’æ›¸ã„ãŸã‚Šã‚‚ã—ã¾ã—ãŸã€‚ã‚‚ã†å…å¹´å‰â€¦ã“ã¡ã‚‰ã®è«–æ–‡ã¯ TCE ã®å®Ÿç¾ã«ãŠã‘ã‚‹å¸¸å¥—æ‰‹æ®µãŒ JVM ã§ã¯é€šç”¨ã—ãªã„ã‚ˆã¨ã„ã†è©±ã‚„ã€historical ãªè©±ãŒé¢ç™½ãã¦ã€å®Ÿéš›ã®ææ¡ˆæ‰‹æ³•ã¯ã€ã¾ã‚ãƒ€ãƒ¡ã§ã—ã‚‡â€¦ã¿ãŸã„ãªã‚‚ã®ã ã£ãŸã®ã§ã™ãŒã€ä»Šå›žã®è«–æ–‡ã®æ‰‹æ³•ã¯ã‹ãªã‚Šè‰¯ã„ã¨æ€ã„ã¾ã™ã€‚ JVM ã§ TCE ã¨ã„ã†ã¨ã€çŸ¢å¼µã‚Š Trampoline ã§ã™ã€‚Tra
akira1908jp 2016/10/22
JVM

Java

ãƒ¡ãƒ¢ãƒª

OOM
ãƒªãƒ³ã‚¯
JavaPoly.js â€” Java(script) in the Browser
Introduction JavaPoly.js is a library that polyfills native JVM support in the browser. It allows you to import your existing Java code, and invoke the code directly from Javascript. JavaPoly works even if the user does not have Java installed on their computer. It finally allows Java to become a first class citizen by running directly in the browser's script tags (and interacting directly with th
akira1908jp 2016/05/09
Javaã®æ¥ã¯æ·±ã„

javascript

java

JVM
ãƒªãƒ³ã‚¯
JVM! JVM! JVM!
10. jmc Java Mission Control â— ãƒ¡ãƒ¢ãƒªçµ±è¨ˆã€ã‚¹ãƒ¬ãƒƒãƒ‰æ•°ã€ã‚¯ãƒ©ã‚¹æ•°ã‚’ã‚°ãƒ©ãƒ•ã‚£ã‚«ãƒ«ã«è¡¨ ç¤º â— jconsoleã¨ä¼¼ãŸã‚ˆã†ãªæ„Ÿã˜ã ã‘ã©jmcã®æ–¹ãŒãªã†ã„ï¼Ÿ â— ãƒ€ãƒƒã‚·ãƒ¥ãƒœãƒ¼ãƒ‰ã®ã‚«ã‚¹ã‚¿ãƒžã‚¤ã‚ºï¼ˆã‚°ãƒ©ãƒ•ã®è¿½åŠ ï¼‰ãŒå¯èƒ½ â— Flight Recorderã¨ã„ã†ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒªãƒ³ã‚°ãƒ„ãƒ¼ãƒ«ãŒã‚ ã‚‹ã€‚ãŒå•†ç”¨ãƒ©ã‚¤ã‚»ãƒ³ã‚¹ãŒå¿…è¦ï¼ˆã‚‰ã—ã„ â— -XX:+UnlockCommercialFeatures -XX:+FlightRecorder â— Eclipseãƒ—ãƒ©ã‚°ã‚¤ãƒ³ã¨ã—ã¦ã‚‚åˆ©ç”¨ã§ãã‚‹ï¼ˆã‚‰ã—ã„
akira1908jp 2014/06/13
jvm
ãƒªãƒ³ã‚¯
Javaã§ãƒ’ãƒ¼ãƒ—é ˜åŸŸã‚’ä½™ã‚‰ã›ãŸã¾ã¾OutOfMemoryErrorã‚’å‡ºã™æ–¹æ³• - è¥¿å°¾æ³°å’Œã®ã¯ã¦ãªãƒ€ã‚¤ã‚¢ãƒªãƒ¼
å…ˆæ—¥ã€ã“ã‚“ãªå•é¡Œã‚’è¦‹ã‹ã‘ãŸã®ã ã‘ã©ã‚‚ã€Javaã®GCã«ã¯ã‚ã¾ã‚Šè©³ã—ããªã„ã®ã§ç”ãˆãŒã‚ã‹ã‚‰ãªã‹ã£ãŸã€‚ OutOfMemoryErrorãŒç™ºç”Ÿã—ã¾ã—ãŸã€‚(ä¸ç•¥)ãƒ’ãƒ¼ãƒ—ãƒ¡ãƒ¢ãƒªã¯è¶³ã‚Šã¦ã„ã‚‹ã‚ˆã†ã§ã™ã€‚åŽŸå› ã¨ã—ã¦ä½•ãŒè€ƒãˆã‚‰ã‚Œã¾ã™ã‹ï¼Ÿ http://d.hatena.ne.jp/iad_otomamay/20130318/1363596244 ãªã‚“ã§ã ã‚ã†ãªãã¨æ€ã£ã¦ã„ãŸã¨ã“ã‚id:moriyoshiãŒã€ŒPermanenté ˜åŸŸãŒã‚ãµã‚ŒãŸã‚“ã˜ã‚ƒãªã„ã®ã€ã¨ä¸€è¨€ã€‚ã€ŒPermanenté ˜åŸŸã€ã§æ¤œç´¢ã—ã¦ã¿ã‚‹ã¨ã€ãªã‚‹ã»ã©ã€ãã†ã„ã†ã“ã¨ãªã®ã‹ãƒ¼ã€‚ ã¨ã„ã†ã‚ã‘ã§æ—©é€Ÿãã‚Œã‚’å†ç¾ã•ã›ã‚‹ã‚³ãƒ¼ãƒ‰ã‚’æ›¸ã„ã¦ã¿ãŸã€‚ãƒ’ãƒ¼ãƒ—ã®å¤§éƒ¨åˆ†ãŒãŒã‚‰ç©ºããªã®ã«Permanenté ˜åŸŸã ã‘99%ã«ãªã£ã¦ã„ã‚‹ã®ãŒã‚ã‹ã‚‹ã‹ã¨æ€ã†ã€‚ Exception in thread "main" [Full GC [Tenured: 515K->515K(56896K
akira1908jp 2013/03/19
JVM

GC
ãƒªãƒ³ã‚¯
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