[B! jvm][thread] yassã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

yass id:yass

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ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã‚’è§£æžã™ã‚‹åœ°ç„ã¨FastThreadã¨ã„ã†Webã‚µãƒ¼ãƒ“ã‚¹ - ç†ç³»å¦ç”Ÿæ—¥è¨˜
ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¨ã„ã†ã¨ã€JVM è¨€èªžã«é–¢ã™ã‚‹é‹ç”¨ã§ãƒžã‚¸ã§å›°ã£ãŸã¨ãã®é ¼ã¿ã®ç¶±ã¿ãŸã„ãªã‚¤ãƒ¡ãƒ¼ã‚¸ã‚ã‚‹ã€‚ãƒžã‚¸ã§å›°ã£ãŸã¨ãã€ã˜ã‚ƒãªãã¦ã€ã‚«ã‚¸ãƒ¥ã‚¢ãƒ«ã«è¦‹ã‚Œã°è‰¯ã„ã‚“ã ã‘ã©ã€ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã®ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆãŒç•°å¸¸ã™ãŽã¦ã¤ã‚‰ããªã‚‹ã€‚ ãã‚‚ãã‚‚ãªã‚“ãªã‚“ã ã“ã®ã‚´ãƒŸã¿ãŸã„ãªãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã¯ã€‚ ä¸€ä½“èª°ãŒã©ã†ã„ã†æ€æƒ³ã®å…ƒã§ã“ã®ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã‚’æ±ºã‚ãŸã®ã‹ã•ã£ã±ã‚Šåˆ†ã‹ã‚‰ãªã„ã—ã€äººé¡žã‚’è‹¦ã—ã‚ã‚‹ãŸã‚ã«æœªæ¥ã‹ã‚‰æ¥ãŸ AI ãŒå‹æ‰‹ã«ç–å®šã—ãŸã®ã§ã¯ãªã„ã‹ã€‚ "[ThreadPool Manager] - Idle Thread" #42 daemon prio=5 os_prio=31 tid=0x000000012a3a7800 nid=0x15503 in Object.wait() [0x000070000ab66000] java.lang.Thread.State: WAITING (on object monitor) at
yass 2017/06/26
thread

thread dump

JVM
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Javaã®ã‚·ã‚¹ãƒ†ãƒ ã‚¹ãƒ¬ãƒƒãƒ‰ã«ã¤ã„ã¦èª¿ã¹ã¦ã¿ãŸ (Java8) - argius note
ã‚·ã‚¹ãƒ†ãƒ ã‚¹ãƒ¬ãƒƒãƒ‰ã«ã¤ã„ã¦ã€ã‚ã¾ã‚ŠçŸ¥ã‚‰ãªã‹ã£ãŸã®ã§ã€èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚ ãã‚Œä»¥å¤–ã«ã‚‚ã€APIã§ç”Ÿæˆã•ã‚Œã‚‹ã‚¹ãƒ¬ãƒƒãƒ‰ã‚„ã€ã‚¹ãƒ¬ãƒƒãƒ‰ã‚°ãƒ«ãƒ¼ãƒ—ã«ã¤ã„ã¦ã‚‚ã€å°‘ã—è§¦ã‚Œã¦ã„ã¾ã™ã€‚ â€»GrepCodeã¯2018å¹´5æœˆé ƒã‹ã‚‰ã‚µãƒ¼ãƒ“ã‚¹ãŒåˆ©ç”¨ã§ããªããªã£ã¦ã„ã¾ã™ã€‚è¨˜äº‹ä¸ã®ãƒªãƒ³ã‚¯ã¯GrepCodeã®ã‚‚ã®ãŒãã“ãã“å¤šã„ã®ã§ã€ã”æ³¨æ„ãã ã•ã„ã€‚ å‚è€ƒãƒªãƒ³ã‚¯ HotSpot Runtime Overview - OpenJDK JVM Internals (JamesDBloom - Blog) Java SE 8 APIä»•æ§˜ GC: openjdk-8-b132.jar - GrepCode Java Project Source Mirror of OpenJDK repositories - GitHub ç›®æ¬¡ ã¯ã˜ã‚ã« å®Ÿè¡Œç’°å¢ƒ ã‚·ã‚¹ãƒ†ãƒ ã‚¹ãƒ¬ãƒƒãƒ‰ã®åç§°ã¨ç°¡å˜ãªèª¬æ˜Ž APIã‚’ä½¿ç”¨ã—ãŸã¨ãã®ã‚¹ãƒ¬ãƒƒãƒ‰ ãŠã‚ã‚Šã« ã¯ã˜ã‚ã« ã‚·
yass 2015/06/07
java

Thread

JVM
ãƒªãƒ³ã‚¯
ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹/ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã®èªã¿æ–¹ ãã®1 â€“ VM å†…éƒ¨ã‚¹ãƒ¬ãƒƒãƒ‰ã¨ main ã‚¹ãƒ¬ãƒƒãƒ‰ â€“ yusuke.blog
ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã®å–ã‚Šæ–¹ã¯å‰ã«èª¬æ˜Žã—ãŸé€šã‚Šã§ã™ã€‚ #äºŒå¹´è¿‘ãå‰ã§ã™ãŒãƒ»ãƒ»ãƒ» ã—ã‹ã—ã€ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¯å–å¾—ã—ãŸã ã‘ã§ã¯å½¹ã«ç«‹ã¡ã¾ã›ã‚“ã€‚ ã‚‚ã¡ã‚ã‚“ã€ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¯è§£æžã—ã¦åˆã‚ã¦ãƒˆãƒ©ãƒ–ãƒ«ã‚·ãƒ¥ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚„ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«å½¹ç«‹ã¤ã‚‚ã®ã§ã™ã€‚ ãã“ã§ã€ä»Šå›žã‹ã‚‰ã¯å…·ä½“çš„ã«ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã®ä¸èº«ã‚’è¦‹ã¦ã„ãã¾ã—ã‚‡ã†ã€‚ èª¬æ˜Žã«ä½¿ã†ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¯ã“ã‚“ãªæ„Ÿã˜ã€‚èµ·å‹•ã—ãŸã‚‰ "Hello World! ã¨è¡¨ç¤ºã—ã¦10ç§’é–“ã‚¹ãƒªãƒ¼ãƒ—ã™ã‚‹ã¨ã„ã†ç°¡å˜ãªã‚‚ã®ã€‚ public class ThreadTest1{ public static void main(String args[]) throws Exception { System.out.println("Hello World!"); method1(); } private static void method1() throws Exception { Threa
yass 2014/07/05
"JVM å†…ã«å˜åœ¨ã™ã‚‹å…¨ã¦ã®ã‚¹ãƒ¬ãƒƒãƒ‰ã‚’ãƒ€ãƒ³ãƒ—ã—ãŸã‚‚ã®ã§ã™ã€‚ ä¸Šè¨˜ã®ä¾‹ã§ã¯"Low Memory Detector", "CompilerThread0", "Signal Dispatcher", "Finalizer", "Reference Handler", "main", "VM Thread", "VM Periodic Task Thread" ã¨ã€è¨ˆï¼™å€‹ã®ã‚¹ãƒ¬ãƒƒãƒ‰ãŒã‚ã‚‹ "

Java

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dump
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Writing Interactive Web Applications with Web Actors
January 28, 2014 Writing Interactive Web Applications with Web Actors By Ron The actor model defined by Carl Hewitt and then evolved and popularized (well, relatively popularized) by the Erlang programming language, has become a very appropriate choice for designing certain kinds of software. Those groups of isolated processes communicating with one another by passing messages back and forth are a
yass 2014/02/23
" This is just to show how simple it is to run blocking operations in web actors (and Comsat in general). But these calls do not block the currentÂ OSÂ thread â€“ only the fiber running the actor, and you can run hundreds of thousands and even millions of fibers on a singleÂ JVMinstance. "

comsat

quasar

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actor
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Little's Law, Scalability and Fault Tolerance: The OS is your bottleneck (and what you can do about it)
February 04, 2014 Little's Law, Scalability and Fault Tolerance: The OS is your bottleneck (and what you can do about it) By Ron Littleâ€™s Law helps us determine the maximum request rate a server can handle. When we apply it, we find that the dominating factor limiting a serverâ€™s capacity is not the hardware but the OS. Should we buy more hardware if software is the probl em? If not, how can we remo
yass 2014/02/22
" if 1000 requests, arrive each second, and each takesÂ 0.5seonds to process, then our system is required to handle 1000*0.5Â = 500 requestsÂ concurrently. / how many such threads could theÂ OSÂ handle concurrently? That depends on theÂ OS, but it is usually somewhere betweenÂ 2KÂ andÂ 15K.Â "

thread

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quasar

comsat

Little's Law
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Quasar - lightweight threads and actors for the JVM
Quasar lightweight threads and actors for the JVM Quasar is an open source JVM library that greatly simplifies the creation of highly concurrent software that is very easy to write and reason about, performant, and fault tolerant. icon Lightweight Threads Quasarâ€™s core implements true lightweight threads on the JVM called fibers. Fibers can be instantiated and run just like regular threads, but ra
yass 2014/02/22
" Quasarâ€™s core provides an implementation of true lightweight threads on the JVM called fibers. Fibers can be instantiated and run very similarly to regular threads, but rather than a few thousand of threads, a single JVM can easily run hundreds of thousands or even millions of fibers. "

jvm

thread

actor

quasar
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Java å…¥é–€ | JVM ã®ãƒ¡ãƒ¢ãƒªæ§‹é€
Revised: 2nd/Nov./2003; Since: 26th/Jan./2003 ãƒ‡ãƒ¼ã‚¿ãƒ»ã‚¨ãƒªã‚¢ JVM ã®ãƒ¡ãƒ¢ãƒªæ§‹é€ ã¯ã€ã‚¹ã‚¿ãƒƒã‚¯ã¨ãƒ’ãƒ¼ãƒ—ã«å¤§åˆ¥ã•ã‚Œã¾ã™ã€‚ãƒ’ãƒ¼ãƒ— (Heap) ã¯ GC ã®å¯¾è±¡ã§ã€JVM èµ·å‹•æ™‚ã«å‰²ã‚Šå½“ã¦ã‚‰ã‚Œã‚‹åºƒå¤§ãªé ˜åŸŸã§ã™ã€‚Java ä»®æƒ³ãƒžã‚·ãƒ³ãƒ»ã‚¹ã‚¿ãƒƒã‚¯ (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‚’å‡ºã—å…¥ã‚Œã™ã‚‹ç·šå½¢ã®ãƒ‡ãƒ¼ã‚¿æ§‹é€ ã§ã™ã€‚ã‚¯ãƒ©ã‚¹ã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ãªã©ã¯ãƒ’ãƒ¼ãƒ—ã«æ ¼ç´ã—ã¾ã™ãŒã€ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã®ã‚ˆã†ãª GC å¯¾è±¡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‚’ãƒ¡ã‚½ãƒƒãƒ‰ãƒ»ã‚¨ãƒªã‚¢ (Method Area) ã¨å‘¼ã³ã¾ã™ã€‚ å›³ï¼šJVM ã®ãƒ¡ãƒ¢ãƒªæ§‹é€ Java ä»®æƒ³ãƒžã‚·ãƒ³ãƒ»ã‚¹ã‚¿ãƒƒã‚¯ JVM ã¯ãƒ—ãƒã‚»ã‚¹ã®ä¸€ã¤ã¨ã—ã¦ã€O
yass 2013/05/22
java

memory

thread

stack

program counter

heap

jvm

gc
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Everything I Ever Learned About JVM Performance Tuning @Twitter
Summarizes about a year worth of experiences and case studies in performance tuning the JVM for various services at Twitter.Read less
yass 2013/03/03
twitter

java

memory

jvm

gc

thread

concurrency
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ã‚¹ãƒãƒ¼ãƒ€ã‚¦ãƒ³ã€ãƒãƒ³ã‚°ã‚’ä¸€ç™ºè§£æ±º ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¯ãƒˆãƒ©ãƒ–ãƒ«ã‚·ãƒ¥ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã®å‘³æ–¹ #wlstudy
The document discusses slowdowns, hangs, and thread dumps in troubleshooting Java applications. It explains that thread dumps provide a snapshot of thread states and what each thread is doing at a point in time. This can help identify issues like threads getting stuck or competing for resources. The document also demonstrates example output of a thread dump with threads in different states like wa
yass 2013/01/25
java

jvm

debug

thread

dump
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Jvm reading-synchronization
1. Locking and Synchronization ç¬¬7å›žJVMã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ãƒªãƒ¼ãƒ‡ã‚£ãƒ³ã‚°ã®ä¼š (OpenJDK) ä¸æ‘ å®Ÿ [email protected] nminoru1975@gmail.com Twitter @nminoru_jp 1 2. Javaã®ã‚¹ãƒ¬ãƒƒãƒ‰æŽ’ä»–æ©Ÿæ§‹ â€¢ Objectã¯ã™ã¹ã¦åŒæœŸã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã«ãªã‚Œã‚‹ â€“ Critical sectionåž‹ã®æŽ’ä»–å‡¦ç† â€“ å†å¸°çš„ãªãƒãƒƒã‚¯ã‚‚å¯èƒ½ â€¢ æ–‡æ³• â€“ synchronizedãƒ¡ã‚½ãƒƒãƒ‰ â€“ Synchronizedæ–‡ â€¢ ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ãƒ¬ãƒ™ãƒ«ã§ã¯monitorenterã€ monitorexit â€“ wait & notify 2 3. Java Synchronizationã®å•é¡Œç‚¹ â€¢ å®‰æ˜“ã«æ›¸ã‘ã‚‹ãŸã‚ä½¿ã„ã™ãŽã‚‹ â€“ ä¸è¦ãªå ´æ‰€ã«ã‚‚synchronizedã‚’æ›¸ã„ã¦ã—ã¾ã†ã€‚ â€“ è¡çªã—ãªã„synchronizat
yass 2013/01/04
java

thread

jvm

synchronized

cas

lock
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Who ordered sequential consistency?
yass 2013/01/02
java

jvm

thread

lock

toread

concurrency
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