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JVMã®ãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚ºã¨ã‚³ãƒ³ãƒ†ãƒŠæ™‚ä»£ã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚° | Folioscope
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sheeplogh 2019/08/16
java

performance
ãƒªãƒ³ã‚¯
æ–°ã—ã„ãƒªãƒªãƒ¼ã‚¹ãƒ¢ãƒ‡ãƒ«ã¯Javaã‚’ä½¿ã†äºº å…¨å“¡è¦æ³¨ç›®ã ã£ãŸ - ãã—ã ã®Hatena
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sheeplogh 2017/10/07
java
ãƒªãƒ³ã‚¯
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sheeplogh 2017/06/27
java

thread dump
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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‚°
ã“ã‚“ã«ã¡ã¯ã€‚ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³åŸºç›¤ãƒãƒ¼ãƒ ã®æ¨ªç”°ã§ã™ã€‚ Javaã®è¬Žã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹åŠ£åŒ–ã«ã¾ã¤ã‚ã‚‹èª¿æŸ»ã‚’ã—ã¦ã„ãŸã®ã§ã™ãŒã€1ãƒ¶æœˆã®è‹¦åŠ´ã®æœ«ã«åŽŸå› ãŒã‚ã‹ã‚Šã¾ã—ãŸã®ã§ã€å ±å‘Šã•ã›ã¦ã„ãŸã ãã¾ã™ï¼ å…¬é–‹å¾Œã«é ‚ã„ãŸã¯ã¦ãªãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ã§ã®ã”æŒ‡æ‘˜ãƒ»ç¤¾å†…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†…å®¹ã«ã¤ãã¾ã—ã¦ã¯ã€è¨˜äº‹ã®æœ€å¾Œã‚’å‚ç…§ã—ã¦ãã ã•ã„ã€‚ å¿™ã—ã„äººã®ãŸã‚ã®ã¾ã¨ã‚ jdk-7u4ä»¥é™ã®jdk-7 *1 ã§Javaã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãŒåŠ£åŒ–ã™ã‚‹è¬Žã®ç¾è±¡ CodeCacheã®å®¹é‡é™ç•Œã«è¿‘ã¥ãã¨JITã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã‚’åœæ¢ã—ã¦ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã—ãŸã‚³ãƒ¼ãƒ‰ã‚’æ¨ã¦ã‚‹æ©Ÿèƒ½ãŒåŽŸå› ã ã£ãŸ èµ·å‹•ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã§å›žé¿ã§ãã‚‹ã®ã§ã€é•·æœŸé‹ç”¨ã™ã‚‹ã¨ãã¯ -XX:-UseCodeCacheFlushing, -XX:ReservedCodeCacheSize=128m ã‚’ã¤ã‘ã‚‹ ä¸Šã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’è¨å®šã—ãŸæ™‚ã«ã€C
sheeplogh 2016/04/13
java

performance
ãƒªãƒ³ã‚¯
Javaã®ãƒ—ãƒã‚°ãƒ©ãƒ ã¯ã©ã†ã‚„ã£ã¦å‹•ã„ã¦ã„ã‚‹ã®? GCç·¨
Mixture-of-Personas Language Models for Population Simulation
sheeplogh 2015/04/26
java
ãƒªãƒ³ã‚¯
Javaã®ãƒ—ãƒã‚°ãƒ©ãƒ ã¯ã©ã†ã‚„ã£ã¦å‹•ã„ã¦ã„ã‚‹ã®? JVMç·¨
Yahoo! JAPANã®IaaSã‚’æ”¯ãˆã‚‹Kubernetesã‚¯ãƒ©ã‚¹ã‚¿ã€ã‚¢ãƒƒãƒ—ãƒ‡ãƒ¼ãƒˆè‡ªå‹•åŒ–ã¸ã®æŒ‘æˆ¦ #yjtc
sheeplogh 2015/04/26
java
ãƒªãƒ³ã‚¯
jstat - Java ä»®æƒ³ãƒžã‚·ãƒ³çµ±è¨ˆãƒ‡ãƒ¼ã‚¿ç›£è¦–ãƒ„ãƒ¼ãƒ«
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sheeplogh 2015/04/23
jstat

java

monitoring

performance
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ææ€–ã® JVM å¤§é‡ãƒ¡ãƒ¢ãƒªæ¶ˆè²»ï¼ãƒ¡ãƒ¢ãƒªãƒªãƒ¼ã‚¯ã®è¬Žã‚’è¿½ãˆï¼ï¼ - Cybozu Inside Out | ã‚µã‚¤ãƒœã‚¦ã‚ºã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®ãƒ–ãƒã‚°
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sheeplogh 2015/02/03
java
ãƒªãƒ³ã‚¯
Java SE å†å…¥é–€
20190828 AWS Black Belt Online Seminar Amazon Aurora with PostgreSQL Compatib...
sheeplogh 2015/01/14
java
ãƒªãƒ³ã‚¯
Java8ã®HotSpotVMã‹ã‚‰Permanenté ˜åŸŸãŒæ¶ˆãˆãŸç†ç”±ã¨ãã®å½±éŸ¿ | ã‚®ãƒ¼ã‚¯ã‚’ç›®æŒ‡ã—ã¦
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sheeplogh 2014/12/26
java

performance
ãƒªãƒ³ã‚¯
Archive: Java[tm] Technology Products Download
WARNING: These older versions of the JRE and JDK are provided to help developers debug issues in older systems. They are not updated with the latest security patches and are not recommended for use in production. For production use Oracle recommends downloading the latest JDK and JRE versions and allowing auto-update. Only developers and enterprise administrators should download these releases. Do
sheeplogh 2014/12/17
å¤ã„JRE/JDKã‚’é…å¸ƒã€‚

java
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Javaã®æ–°ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯JDK1.9ã§ã¯ãªã„
ã‚ãªãŸã«ã¨ã£ã¦é‡è¦ãªãƒˆãƒ”ãƒƒã‚¯ã‚„åŒåƒšã®æœ€æ–°æƒ…å ±ã‚’å…¥æ‰‹ã—ã¾ã—ã‚‡ã†æœ€æ–°ã®æ´žå¯Ÿã¨ãƒˆãƒ¬ãƒ³ãƒ‰ã«é–¢ã™ã‚‹æœ€æ–°æƒ…å ±ã‚’å³åº§ã«å—ã‘å–ã‚Šã¾ã—ã‚‡ã†ã€‚ ç¶™ç¶šçš„ãªå¦ç¿’ã®ãŸã‚ã«ã€ç„¡æ–™ã®ãƒªã‚½ãƒ¼ã‚¹ã«æ‰‹è»½ã«ã‚¢ã‚¯ã‚»ã‚¹ã—ã¾ã—ã‚‡ã†ãƒŸãƒ‹ãƒ–ãƒƒã‚¯ã€ãƒˆãƒ©ãƒ³ã‚¹ã‚¯ãƒªãƒ—ãƒˆä»˜ãå‹•ç”»ã€ãŠã‚ˆã³ãƒˆãƒ¬ãƒ¼ãƒ‹ãƒ³ã‚°æ•™æã€‚ è¨˜äº‹ã‚’ä¿å˜ã—ã¦ã€ã„ã¤ã§ã‚‚èªã‚€ã“ã¨ãŒã§ãã¾ã™è¨˜äº‹ã‚’ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ã—ã¦ã€æº–å‚™ãŒã§ããŸã‚‰ã„ã¤ã§ã‚‚èªã‚ã¾ã™ã€‚
sheeplogh 2014/12/12
java
ãƒªãƒ³ã‚¯
ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«ä½¿ãˆã‚‹Javaæ€§èƒ½ç›£è¦–ãƒ„ãƒ¼ãƒ«
JavaVMã‚’ç›£è¦–ã™ã‚‹ãƒ„ãƒ¼ãƒ«ç¾¤ ä»Šå›žã¯ã€Java EEã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚’ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã™ã‚‹éš›ã«ä¾¿åˆ©ãªãƒ„ãƒ¼ãƒ«ã‚’ç´¹ä»‹ã—ã¾ã™ã€‚JavaVMã®çŠ¶æ…‹ã‚’ç›£è¦–ï¼ãƒ¬ãƒãƒ¼ãƒˆã™ã‚‹ãƒ„ãƒ¼ãƒ«ã¯ã€ãƒ•ãƒªãƒ¼ãƒ»ã‚½ãƒ•ãƒˆã‚¦ã‚¨ã‚¢ã‚„è£½å“ã‚’å«ã‚ã€ã„ãã¤ã‹æä¾›ã•ã‚Œã¦ã„ã¾ã™ã€‚ç±³Oracleï¼ˆç±³Sun Microsystemsï¼‰ã®Javaç’°å¢ƒã«ã‚‚ã€æ¨™æº–ã§ä¾¿åˆ©ãªãƒ„ãƒ¼ãƒ«ç¾¤ãŒä»˜ã„ã¦ã„ã¾ã™ã€‚æœ¬è¨˜äº‹ã§ã¯ã€æ¨™æº–ãƒ„ãƒ¼ãƒ«ã§ã‚ã‚‹jconsoleã¨jstatã®2ã¤ã‚’ç´¹ä»‹ã—ã¾ã™ã€‚ è¡¨1: ä¸»ãªJavaVMç›£è¦–ï¼ãƒ¬ãƒãƒ¼ãƒ†ã‚£ãƒ³ã‚°ãƒ»ãƒ„ãƒ¼ãƒ« è£½å“å ç‰¹å¾´
sheeplogh 2014/12/09
performance

java
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JVMã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚° - ITã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã¨ã—ã¦ç”Ÿãã‚‹
å‰å›žã€JVMã¨GCã®ã—ãã¿ - IT ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã¨ã—ã¦ç”Ÿãã‚‹ã§JVMã¨GCã®ã—ãã¿ã«ã¤ã„ã¦æ›¸ã„ãŸã€‚ ä»Šå›žã¯ãã®ç¶šãã¨ã„ã†ã“ã¨ã§JVMã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«ã¤ã„ã¦æ›¸ããŸã„ã¨æ€ã†ã€‚ JVMãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã£ã¦ -Xms ãƒ»ãƒ»ãƒ» ãƒ’ãƒ¼ãƒ—å…¨ä½“ï¼ˆNewé ˜åŸŸï¼‹Oldé ˜åŸŸï¼‰ã®åˆæœŸå€¤ -Xmx ãƒ»ãƒ»ãƒ» ãƒ’ãƒ¼ãƒ—å…¨ä½“ï¼ˆNewé ˜åŸŸï¼‹Oldé ˜åŸŸï¼‰ã®æœ€å¤§å€¤ ãã‚‰ã„ã—ã‹è©±é¡Œã«ä¸ŠãŒã‚‰ãªã„ã—æ„è˜ã—ãªã„ã“ã¨ãŒå¤šã„ï¼ˆæ°—ãŒã™ã‚‹ï¼‰ã€‚ ã§ã‚‚ãƒ›ãƒ³ãƒˆã¯ã“ã‚Œã ã‘ã§ã¯ãƒ€ãƒ¡ã§ã€å‰å›žã®ã‚ˆã†ã«Permanenté ˜åŸŸã€Newé ˜åŸŸã€Oldé ˜åŸŸã‚’æ„è˜ã—ãŸãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ãŒå¿…è¦ã«ãªã‚‹ã€‚ VMãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã‚’è€ƒãˆã‚‹ãã®å‰ã«ãƒ»ãƒ»ãƒ»ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã®è©±ã‚’ã™ã‚‹å‰ã«ã¾ãšVMã®èµ·å‹•ãƒ¢ãƒ¼ãƒ‰ã«ã¤ã„ã¦è©±ã—ãŸã„ã¨æ€ã†ã€‚ VMã«ã¯å¤§ããä»¥ä¸‹ï¼’ã¤ã®èµ·å‹•ãƒ¢ãƒ¼ãƒ‰ãŒã‚ã‚Šã€ãã‚Œãžã‚Œä»¥ä¸‹ã®ã‚ˆã†ãªç‰¹å¾´ã‚’æŒã¤ã€‚ â—†ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆVMãƒ¢ãƒ¼ãƒ‰ èµ·å‹•æ™‚é–“ã‚’çŸç¸®ã—ã€ãƒ¡ãƒ¢ãƒªã‚µã‚¤ã‚ºã‚’ç¸®å°ã™ã‚‹ã‚ˆã†ã«èª¿æ•´ã•ã‚Œã¦ã„ã‚‹ã€‚ VMèµ·å‹•æ™‚
sheeplogh 2014/11/21
java

performance
ãƒªãƒ³ã‚¯
JavaVMã®ãƒ¡ãƒ¢ãƒªç®¡ç†ã«é–¢ã™ã‚‹ã¾ã¨ã‚ï¼ˆJavaãƒ’ãƒ¼ãƒ—ã€GCã€ãƒ€ãƒ³ãƒ—ç‰ï¼‰ - ãºãƒ¼ãºãƒ¼SEã®ãƒ–ãƒã‚°
æœ¬ãƒ–ãƒã‚°ã¯Java8ï¼ˆç‰¹ã«Metaspaceï¼‰ã«å¯¾å¿œã—ã¦ã„ãªã„ã€‚ ä¸‹è¨˜ã«Java8ä»¥é™ã«å¯¾å¿œã—ãŸè¨˜äº‹ã‚’è¨˜è¼‰ã™ã‚‹ï¼ˆäºˆå®šï¼‰ã€‚ blog.pepese.com JavaVMã®ãƒ¡ãƒ¢ãƒªé ˜åŸŸã«ã¤ã„ã¦ JavaVMãŒç®¡ç†ã™ã‚‹ãƒ¡ãƒ¢ãƒªé ˜åŸŸã«ã¤ã„ã¦ éšŽå±¤1 éšŽå±¤2 éšŽå±¤3 èª¬æ˜Ž Javaãƒ’ãƒ¼ãƒ— JavaVMä¸Šã§èµ·å‹•ã™ã‚‹Javaãƒ—ãƒã‚°ãƒ©ãƒ ã®ãƒªã‚½ãƒ¼ã‚¹ã‚’ç®¡ç†ã™ã‚‹é ˜åŸŸã€‚Newé ˜åŸŸã¨Oldé ˜åŸŸã§æ§‹æˆã•ã‚Œã‚‹ã€‚ ï½Œ" Newé ˜åŸŸ æ–°è¦ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã¨é–¾å€¤ï¼ˆ-XX:MaxTenuringThresholdï¼‰æœªæº€ã®ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆãŒé…ç½®ã•ã‚Œã‚‹ã€‚ï¼ˆYoungé ˜åŸŸã¨ã‚‚å‘¼ã°ã‚Œã‚‹ï¼‰ ï½Œ ï½Œ" Edené ˜åŸŸ æ–°è¦ã®ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆãŒé…ç½®ã•ã‚Œã‚‹ã€‚ ï½Œ ï½Œ" Fromé ˜åŸŸ CopyGC(ScavengeGCã€ãƒžã‚¤ãƒŠãƒ¼GC)ãŒå®Ÿè¡Œã•ã‚ŒãŸéš›ã«ã€ä½¿ç”¨ä¸ã®ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã¯ã“ã“ã¸ã‚³ãƒ”ãƒ¼ã•ã‚Œã‚‹ã€‚ï¼ˆS0ã‚„S1ã¨ã‚‚å‘¼ã°ã‚Œã‚‹ï¼‰ ï½Œ ï½Œãƒ¼ Toé ˜åŸŸ CopyGC(Scav
sheeplogh 2014/11/21
java
ãƒªãƒ³ã‚¯
-XX:+PrintFlagsFinal
During some GC Tuning related Googling yesterday, I came across a JVM flag I had never seen before -XX:+PrintFlagsFinal So I tried it with the simplest java command I could think of java -XX:+PrintFlagsFinal -version I'm not going to post the output, as it is almost 700 lines long. In addition to printing the standard version information, it prints a list of (almost) every JVM Parameter your JDK b
sheeplogh 2014/11/18
java

performance
ãƒªãƒ³ã‚¯
Find out your Java heap memory size - Mkyong.com
In this article, we will show you how to use the -XX:+PrintFlagsFinal to find out your heap size detail. In Java, the default and maximum heap size are allocated based on this â€“ ergonomics algorithm. Heap sizes Initial heap size of 1/64 of physical memory up to 1Gbyte Maximum heap size of 1/4 of physical memory up to 1Gbyte However, above algorithms are just for reference, it may vary in different
sheeplogh 2014/11/18
performance

java
ãƒªãƒ³ã‚¯
Default values for Xmx, Xms, MaxPermSize on non-server-class machines
What are the default values for the following options in Java 6 on a non-server-class machine? -Xmx -XX:MaxPermSize Oracle's documentation states that: On server-class machines running the server VM, the garbage collector (GC) has changed from the previous serial collector (-XX:+UseSerialGC) to a parallel collector (-XX:+UseParallelGC). and On server-class machines running either VM (client or ser
sheeplogh 2014/11/18
performance

java
ãƒªãƒ³ã‚¯
Javaã¯ã©ã®ã‚ˆã†ã«å‹•ãã®ã‹ï½žå›³è§£ã§ã‚ã‹ã‚‹JVMã®ä»•çµ„ã¿ è¨˜äº‹ä¸€è¦§ | gihyo.jp
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sheeplogh 2014/09/19
java

performance
ãƒªãƒ³ã‚¯
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