Kazuho@Cybozu Labs: 「サーãƒæ›¸ããªã‚‰ epoll 使ã†ã¹ãã€ã¯ã€ä»Šã§ã‚‚æ£ã—ã„ã®ã‹
多数ã®TCP接続をãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ã™ã‚‹ã‚µãƒ¼ãƒã‚’書ããªã‚‰ã€1コãƒã‚¯ã‚·ãƒ§ãƒ³1スレッドã®ãƒ¢ãƒ‡ãƒ«ã§ã¯ãªãã€epollã‚„kqueueã®ã‚ˆã†ãªã‚¤ãƒ™ãƒ³ãƒˆé§†å‹•åž‹ã®I/O多é‡åŒ–ã‚’è¡Œã†ã¹ãã ã€ã¨è¨€ã‚ã‚Œã¾ã™ã€‚ã ãŒã€ãã®ã‚ˆã†ãªä¸»å¼µã¯ã€ã€ŒC10Kå•é¡Œã€ãŒæ›¸ã‹ã‚ŒãŸ2002å¹´ã‹ã‚‰7年経éŽã—ãŸä»Šã§ã‚‚有効ãªã®ã§ã—ょã†ã‹ï¼Ÿã€€echoサーãƒã‚’書ã„ã¦ã€ãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯ã‚’å–ã£ã¦ã¿ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ ãµãŸã¤ã®ã‚°ãƒ©ãƒ•ã¯ã€ã„ãšã‚Œã‚‚接続数ã¨ã‚¹ãƒ«ãƒ¼ãƒ—ットã®é–¢ä¿‚を表ã—ã¦ã„ã¾ã™ã€‚最åˆã®ã‚°ãƒ©ãƒ•ã¯ã€å…¨æŽ¥ç¶šãŒã‚¢ã‚¯ãƒ†ã‚£ãƒ–ã«é€šä¿¡ã—ãŸå ´åˆã€ã‚ã¨ã®ã‚°ãƒ©ãƒ•ã¯ã€å…¨æŽ¥ç¶šã®ã†ã¡å°æ•°ã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ãŒé †æ¬¡ã‚¢ã‚¯ãƒ†ã‚£ãƒ–ã«ãªã£ã¦ã„ãã€ã¨ã„ã†ãƒ¢ãƒ‡ãƒ«ã§ã™ã€‚ã“れらã®ã‚°ãƒ©ãƒ•ã‹ã‚‰ã€ä»¥ä¸‹ã‚ˆã†ãªã“ã¨ãŒèªã¿å–ã‚Œã¾ã™ã€‚ epoll ã‚‚ per-thread モデルもã€è‰¯ãスケールã™ã‚‹ epoll ã¯ã€ãƒ¯ãƒ¼ã‚¯ã‚»ãƒƒãƒˆãŒå°ã•ã„å ´åˆã« (最大50%) per-thread モデルよりも高速 å°‘ãªãã¨ã‚‚ã€1コãƒ
Wide Awake Developers: Two Ways To Boost Your Flagging Web Site
Being fast doesn't make you scalable. But it does mean you can handle more capacity with your current infrastructure. Take a look at this diagram of request handlers. You can see that it takes 13 request handling threads to process this amount of load. In the next diagram, the requests arrive at the same rate, but in this picture it takes just 200 milliseconds to answer each one. Same load, but on
Erlang楽ã—ã„♪ - ã¿ã‹ãƒã‚°
最近Erlangを勉強ä¸ãªã®ã ã‘ã©ï¼Œã‹ãªã‚Šè‰¯ã„感触． メジャーã˜ã‚ƒãªã„言語（C/C++，Perl，Java，PHP，Rubyãらã„？）ã¯ï¼Œèˆˆå‘³ã‚’æŒã£ã¦ã‚‚，実際ã«æ¥å‹™ã§å°Žå…¥ã™ã‚‹ï¼Œã¨ã„ã†ã¨ã“ã‚ã¾ã§ã¯è¡Œã‹ãªã„ã®ã ã‘ã©ï¼ŒErlangã¯å®Ÿéš›ã«ä½¿ã„ãŸã„ã¨æ€ã†ã»ã©ï¼Ž MLã§Erlangã®è©±ã®è³‡æ–™ãŒå…¬é–‹ã•ã‚Œã¦ã„ã¦ï¼Œ Threads is evil. Processes are ugly. State machines send you mad. ã¨ã„ã†ã“ã¨ã§ï¼ŒErlang良ã„よ，ã¨ã„ã†å†…容． 多数ã®ãƒªã‚¯ã‚¨ã‚¹ãƒˆã‚’扱ã†ã‚ˆã†ãªã‚µãƒ¼ãƒã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚’ä½œã‚‹å ´åˆï¼Œã‚¹ãƒ¬ãƒƒãƒ‰ã¯è¦‹ã¤ã‘ã«ãã„ãƒã‚°ãŒã‚ˆãèµ·ã“る上ã«ãã“ã¾ã§ã‚¹ã‚±ãƒ¼ãƒ«ã—ãªã„ã—，マルãƒãƒ—ãƒã‚»ã‚¹ã¯é…ã„＆スケールã—ãªã„． C10Kå•é¡Œã¨è¨€ã‚ã‚Œã¦ã„ã¦ï¼Œè§£æ±ºã™ã‚‹æ–¹æ³•ã¨ã—ã¦ã¯ï¼ŒãƒŽãƒ³ãƒ–ãƒãƒƒã‚ング呼ã³å‡ºã—ã¨ã‹éžåŒæœŸå‘¼ã³å‡ºã—ã§è‡ªå‰ã§å„コãƒã‚¯ã‚·ãƒ§ãƒ³ã®çŠ¶æ…‹ã‚’管ç†ã—ã¦ãŒã‚“ã°ã‚‹ã—ã‹ãªã„ã‚
C10K å•é¡Œ - Backnumbers: Steps to Phantasien
訳ã—ã¦ã¿ãŸ. ã¾ãŸ YukiWiki ã«ç½®ã‹ã›ã¦ã‚‚らã£ã¦ã¾ã™. å…ƒãƒã‚¿ã¯ "The C10K Problem". 年末年始ã«è¨³ã—ã‹ã‘ãŸã‘ã‚Œã©æ™‚間切れã§æ”¾ç½®ã—ã¦ã‚ã£ãŸ. 今日ã¯ã„ã¾ã„ã¡æ–°ã—ã„ã“ã¨ã‚’ã‚„ã‚‹æ°—ãŒãŠããš, 外出ã™ã‚‹è²¡åŠ›ã‚‚ãªã, 後始末ã§ã‚‚ã™ã‚‹ã‹ã¨å†é–‹ã—ã¦å®Œäº†. 引用ã•ã‚Œã‚‹å‰²ã«èªã¾ã‚Œã¦ã„ãªã„ã¨æ„Ÿã˜ãŸã®ãŒè¨³ãã†ã¨æ€ã£ãŸå‹•æ©Ÿ. 資料的価値ã¯é«˜ã„ã®ã‹ã‚‚ã—ã‚Œãªã„ã‘ã‚Œã©, ãŸã—ã‹ã«èªã¿ç‰©ã¨ã—ã¦ã¯ã‚ã¾ã‚Šã‚ˆããªã„. 特ã«å¾ŒåŠã¯ãƒˆãƒ”ックã®åˆ—挙ã¨ç®‡æ¡æ›¸ãã°ã‹ã‚Šã§è¨³ã™ã®ã¯é€€å±ˆ. ã¾ã‚, 仕方ãªã„ã‚“ã ã‘ã©. 資料ã ã—... èªã¿ç‰©ã¨ã—ã¦é¢ç™½ããªã„ã‚‚ã®ã¯è¨³ã™ã®ã‚‚è¾›ã„ã¨å¦ã³ã¾ã—ãŸ. é•·ã„ã®ã¨é€€å±ˆãªã®ã¨ã§ã‹ãªã‚Šé›‘ã«ãªã£ã¦ã—ã¾ã£ãŸ. 機械翻訳ã«æ¯›ãŒç”ŸãˆãŸã‚‚ã®ã¨å‰²ã‚Šåˆ‡ã‚Š, æ°—ã«ãªã‚‹éƒ¨åˆ†ã¯æ·»å‰Šã—ã¦ã‚‚らãˆã‚‹ã¨å¬‰ã—ã‚…ã†ã”ã–ã„ã¾ã™. ã‚らã‚らã‹ã—ã“.
TheC10kProblem - 「C10Kå•é¡Œã€ï¼ˆã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆ1万å°å•é¡Œï¼‰ã¨ã¯ã€ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ã®æ€§èƒ½ä¸Šã¯å•é¡ŒãŒãªãã¦ã‚‚ã€ã‚ã¾ã‚Šã«ã‚‚クライアントã®æ•°ãŒå¤šããªã‚‹ã¨ã‚µãƒ¼ãƒãŒãƒ‘ンクã™ã‚‹å•é¡Œã®ã“ã¨
TheC10kProblem - 「C10Kå•é¡Œã€ï¼ˆã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆ1万å°å•é¡Œï¼‰ã¨ã¯ã€ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ã®æ€§èƒ½ä¸Šã¯å•é¡ŒãŒãªãã¦ã‚‚ã€ã‚ã¾ã‚Šã«ã‚‚クライアントã®æ•°ãŒå¤šããªã‚‹ã¨ã‚µãƒ¼ãƒãŒãƒ‘ンクã™ã‚‹å•é¡Œã®ã“㨠目次 ã“ã®æ–‡æ›¸ã«ã¤ã„㦠C10K å•é¡Œ 関連サイト ã¾ãšèªã‚€ã¹ã本 I/O フレームワーク I/O 戦略 1. å„スレッドãŒè¤‡æ•°ã®ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã‚’å—ã‘付ã‘ã‚‹. ãã—ã¦ãƒŽãƒ³ãƒ–ãƒãƒƒã‚ング I/O 㨠レベル・トリガ型ã®å®Œäº†é€šçŸ¥ã‚’利用ã™ã‚‹. ä¼çµ±çš„㪠select() ä¼çµ±çš„㪠poll() /dev/poll kqueue() 2. å„スレッドãŒè¤‡æ•°ã®ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã‚’å—ã‘付ã‘ã‚‹. ãã—ã¦ãƒŽãƒ³ãƒ–ãƒãƒƒã‚ング I/O 㨠変更型ã®å®Œäº†é€šçŸ¥(readiness change notification)を利用ã™ã‚‹. kqueue() epoll リアルタイム・シグナル fd å˜ä½ã®ã‚·ã‚°ãƒŠãƒ« (Signal-per-fd)
Content delivery system design mistakes
This week I helped dealing with performance problems (part MySQL related and part related to LAMP in general) of system which does quite a bit of content delivery, serving file downloads and images – something a lot of web sites need to do these days. There were quite a bit of mistakes in design for this one which I though worth to note, adding some issues seen in other systems. Note this list app
マルãƒãƒ»ã‚¹ãƒ¬ãƒƒãƒ‰ï¼ˆmulti-thread）プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®è½ã¨ã—ç©´ã€ãã®ï¼‘（ã‹ã‚‚ã—ã‚Œãªã„）
ã“ã“ã®ã¨ã“ã‚技術系ブãƒã‚¬ãƒ¼ã®é–“ã§è©±é¡Œã«ãªã£ã¦ã„ã‚‹ã€ã€ŒC10Kå•é¡Œï¼ˆå‚照１ã€å‚照２）ã€ã¯ã€ã²ã¨ã“ã¨ã§è¨€ãˆã°ã€å¤šãã®ã‚¦ã‚§ãƒ–・サーãƒãƒ¼ã§æŽ¡ç”¨ã•ã‚Œã¦ã„ã‚‹multi-threadã‚„multi-processã«é ¼ã£ãŸï¼ˆã‚‚ã—ãã¯é ¼ã‚Šã™ãŽãŸï¼‰å¤šé‡å‡¦ç†ã¨ã„ã†ã‚¢ãƒ¼ã‚テクãƒãƒ£ãƒ¼ã®ã‚¹ã‚±ãƒ¼ãƒ©ãƒ“リティã«å¯¾ã™ã‚‹æ¥µã‚ã¦ã¾ã£ã¨ã†ãªè¦å‘Šã§ã‚る。 ã“ã®è©±ã¯ã€æ±ºã—ã¦æœ€è¿‘ã«ãªã£ã¦å§‹ã¾ã£ãŸè©±ã§ã¯ãªãã€ãƒ‘ソコンæ¥ç•Œã§ã¯ãƒ‘ソコンã®OSã«preemptiveãªãƒžãƒ«ãƒã‚¿ã‚¹ã‚¯ãŒå°Žå…¥ã•ã‚Œã¯ã˜ã‚ãŸï¼™ï¼å¹´ä»£ã®å‰åŠã‹ã‚‰ã€ã•ã‚‰ã«é¡ã‚‹ã¨ã€DECã‚’ä¸å¿ƒã«ãƒ†ã‚¯ãƒŽãƒã‚¸ãƒ¼ãŒé€²åŒ–ã—ãŸãƒŸãƒ‹ã‚³ãƒ³ã®æ™‚代ã‹ã‚‰ã€ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ãƒ»ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãŸã¡ã®é–“ã§ç››ã‚“ã«è¨Žè«–ã•ã‚Œã¦ããŸãƒ†ãƒ¼ãƒžã§ã‚る（ã•ã™ãŒã«ã€ãƒ¡ã‚¤ãƒ³ãƒ•ãƒ¬ãƒ¼ãƒ 時代ã®è©±ã¯ç§ã¯çŸ¥ã‚‰ãªã„）。 å数年を経ãŸä»Šã§ã‚‚ã€ã„ã¾ã ã«æ±ºç€ãŒä»˜ã„ã¦ã„ãªã„ã“ã®å•é¡Œã¯ã€ç§ã®å¤§å¥½ããªãƒ†ãƒ¼ãƒžã®ä¸€ã¤ã§ã‚‚ã‚ã‚‹ã—ã€ã‚‚ã—ç§ãŒåšå£«å·ã‚’ã“ã‚Œã‹ã‚‰å–å¾—ã—よã†ã¨ã™ã‚‹ã®ã§ã‚ã‚Œã°ã€
1
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
C10M
ce-lab.net
{{#tags}}- {{label}}
{{/tags}}