What Your Computer Does While You Wait
This post takes a look at the speed - latency and throughput - of various subsystems in a modern commodity PC, an Intel Core 2 Duo at 3.0GHz. I hope to give a feel for the relative speed of each component and a cheatsheet for back-of-the-envelope performance calculations. I've tried to show real-world throughputs (the sources are posted as a comment) rather than theoretical maximums. Time units ar
amachang 㮠「一行㧠IE ã® JavaScript を高速化ã™ã‚‹æ–¹æ³•ã€ã‚’掘り下ã’ã¦ã¿ãŸ - latest log
2009-11-12 ナビå記法ã«ã¤ã„ã¦è¿½è¨˜ã—ã¾ã—㟠本文 今日ã¯ã€amachangã•ã‚“ã®è¨˜äº‹ http://d.hatena.ne.jp/amachang/20071010/1192012056 ã‚’ 1mm ã ã‘掘り下ã’ã€IE 以外ã®ãƒ–ラウザã§ã‚‚ document ã¸ã®ã‚¢ã‚¯ã‚»ã‚¹ã‚’速ãã™ã‚‹æ–¹æ³•ãŒãªã„ã‹ã€è‰²ã€…試ã—ã¦ã¿ã¾ã™ã€‚ # 記事自体ã¯ãšã„ã¶ã‚“å‰ã«æ›¸ã上ã’ã¦ãŸã‘ã©ã€å…¬é–‹ã™ã‚‹ã®å¿˜ã‚Œã¦ãŸã‚“ã ãªã€‚ Cç³»ã‚’è¿½åŠ ã—ã¾ã—ãŸã€‚Cç³»ã¯ã€Œãƒã‚¹ãƒˆã—ãŸã‚¹ã‚³ãƒ¼ãƒ—ã‹ã‚‰ã‚°ãƒãƒ¼ãƒãƒ«å¤‰æ•°ã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ã¨ã©ã†ãªã‚‹ã‹?ã€ãŒãƒ†ãƒ¼ãƒžã§ã™ã€‚ 試ã—ãŸã“㨠以下ã¯æ§˜ã€…ãªæ–¹æ³•ã§ document ã¸ã®ã‚¢ã‚¯ã‚»ã‚¹é€Ÿåº¦ã‚’計測ã—ã¾ã™ã€‚ Aç³»ã§ã¯ã€éžæ—¥å¸¸çš„ãªæ–¹æ³•ã§æ¸¬å®šã—ã€Bç³»ã§ã¯å®Ÿéš›ã®ç”¨æ³•ã«è¿‘ã„å½¢ã§æ¸¬å®šã—ã¾ã™ã€‚Cç³»ã§ã¯ä½•é‡ã«ã‚‚ãƒã‚¹ãƒˆã—ãŸã‚¹ã‚³ãƒ¼ãƒ—ã‹ã‚‰ã€ã‚°ãƒãƒ¼ãƒãƒ«å¤‰æ•°ã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ã¨ã©ã†ãªã‚‹ã‹ã‚’測定ã—ã¾ã™ã€‚ Aç³» A0 ã¯ã€ç´ ã® document ã«
EfficientJavaScript - Dev.Opera - 効率的㪠JavaScript
EfficientJavaScript - Dev.Opera - 効率的㪠JavaScript 目次 ã“ã®æ–‡æ›¸ã«ã¤ã„㦠効率的㪠JavaScript ECMAScript eval ã‚„ Function ã®ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã‚’使ã†ã®ã¯ã‚„ã‚よㆠeval を書ãæ›ãˆã‚ˆã† 関数を使ã„ãŸã„ãªã‚‰ function を使ãŠã† with を使ã†ã®ã¯ã‚„ã‚よㆠ性能を決ã‚る関数㧠try-catch-finally を使ã†ã®ã¯ã‚„ã‚よㆠeval 㨠with ã¯éš”離ã—よㆠグãƒãƒ¼ãƒãƒ«å¤‰æ•°ã‚’使ã†ã®ã¯ã‚„ã‚よㆠ暗黙ã®ã‚ªãƒ–ジェクト変æ›ã«æ°—ã‚’ã¤ã‘よㆠ性能を決ã‚る関数㧠for-in を使ã†ã®ã¯ã‚„ã‚よㆠ文å—列ã¯ç´¯ç©ã‚¹ã‚¿ã‚¤ãƒ«ã§ä½¿ãŠã† プリミティブã®æ“作ã¯é–¢æ•°å‘¼ã³å‡ºã—より速ㄠsetTimeout() ã‚„ setInterval() ã«ã¯æ–‡å—列ã§ãªã関数を渡ãㆠDOM å†æç”»ã¨å†ãƒ•ãƒãƒ¼ å†ãƒ•ãƒãƒ¼ã®å›žæ•°ã‚’ã§ã
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