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Dustin 鍙戠幇鎻愮ず鏂囧瓧鏄?#8220;You should follow me on Twitter here” 鐨勬晥鏋滄槸“I’m on Twitter.” 173% <a>Human Photos Double Conversion Rates</a> 浠庝袱涓笉鍚岀殑A / B嫻嬭瘯灝嗗湪緗戠珯涓婂鍔犺漿鎹㈢巼鐨勪漢鐨勭収鐗囷細(xì)涓€涓護(hù)浜轟護(hù)浜烘儕璁剁殑緇撹錛孉/B嫻嬭瘯涓ゅ紶鍥劇墖錛屽皢鐪熶漢鐓х墖鏀懼湪緗戠珯涓婁細(xì)鑾峰緱涓€鍊嶇殑杞寲銆傜爺絀惰鏄庯紝鎴戜滑娼滄剰璇嗚鐓х墖鍚稿紩浜?jiǎn)銆?/p> <a>Google Website Optimizer Case Study: Daily Burn, 20%+ Improvement</a> (Tim Ferriss) 涓€涓皢鐢ㄦ埛閫夋嫨鍑忓皯鐨勫彉鍖栦嬌杞寲鎻愰珮浜?0%錛屾渶緇堢殑鐗堟湰鍦ㄧ粏鑺傚拰鏂囧瓧涓婃洿鏄撳惛寮曠洰鍏夈€?/p> <a href="http://visualwebsiteoptimizer.com/split-testing-blog/ab-test-case-study-how-two-magical-words-increased-conversion-rate-by-28/">Two Magical Words Increased Conversion Rate by 28%</a> “It’s free” 榪欎釜鍗曡瘝澧炲姞浜?jiǎn)娉ㄥ唽鎸夐挳鐐瑰嚴(yán)L鏁扮殑28%, 嫻嬭瘯緇撴灉琛ㄦ槑錛屽湪琛屽姩鍙敜涓婁竴浜涘緢灝忕殑鍙樺寲浼?xì)甯︽潵渥o(hù)浜烘儕璁剁殑緇撴灉銆?/p> <a>Changing the Sign-Up Button from Green to Red</a> 渚濋潬A / B嫻嬭瘯錛?CareLogger鎶婃敞鍐屾寜閽粠緇胯壊淇敼涓虹孩鑹插鍔犱簡(jiǎn)34錛呰漿鎹㈢巼錛?/p> <a>Single page vs. multi-step checkout</a> 濡傛灉浣犳湁涓€涓湪綰垮晢搴楋紝寰堝父瑙佺殑灝辨槸鏀粯?gòu)箒绋嬨€傝繖涓狝 / B嫻嬭瘯鍙戠幇錛屽涓敮浠樻祦紼嬫瘮鍗曚釜鏀粯?gòu)箒绋嬪畬鎴愮殑閿€鍞洿濂姐€?/p> <a>“Mad Libs” style form increases conversion 25-40%</a> 鎵撹觸浼犵粺鐨勬櫤鎱э紝姝 / B嫻嬭瘯鍙戠幇涓€孌甸鏍?/em>褰㈠紡杈撳叆瀛楁姣斾紶緇熷艦寮忕殑甯冨眬鏇村ソ銆?/p> <a>Complete redesign of product page increased sales by 20%</a> 涓€涓蔣浠朵駭鍝佺殑鍏徃閲嶆柊璁捐浠栦滑鐨勪駭鍝侀〉緇欏畠涓€涓幇浠ｇ殑澶栬鍜屽鍔犱俊浠繪ā鍧椼€傛渶緇堢粨鏋滐細(xì)浠栦滑鎴愬姛鍦板鍔?0 錛呯殑鎬婚攢鍞銆傛湰妗堜緥鐮旂┒璇佹槑浜?jiǎn)璁捐瀵归攢鍞殑褰卞搷銆?/p> <a>Marketing Experiments response capture case study – triple digit increase in conversions</a> 閫氳繃浼樺寲閭歡鍦板潃鑾峰彇鎻愰珮浜?58 錛呫€傞噸鐐規(guī)槸娑堥櫎鎵€鏈夌殑騫叉壈錛屽茍瑕佹眰娓稿鍙渶鎻愪緵鐢?shù)瀛愰偖錃g鍦板潃銆備嬌鐢ㄤ簹椹€婄ぜ鍝佸崱璁╀粬/濂圭殑瀹屾垚涓漢璧勬枡銆?/p> A/B嫻嬭瘯宸ュ叿 鏈夎澶氫晶閲嶇偣錛屼環(huán)浣嶅拰鍔熻兘涓嶅悓鐨凙 / B嫻嬭瘯宸ュ叿錛岃繖閲屾槸涓€浜涳細(xì) <ul><li><a>Google Website Optimizer</a> 鎼滅儲(chǔ)宸ㄥご鎻愪緵鐨勫厤璐笰/B嫻嬭瘯宸ュ叿銆備竴涓緢濂界殑鍏ラ棬綰у伐鍏鳳紝浣嗘槸娌℃湁涓€浜涘厛榪涚殑鍔熻兘銆?/li></li><li><a>A/Bingo</a> and <a>Vanity</a> 鍩轟簬Ruby on Rails寮€鍙戠殑鏈嶅姟鍣ㄧ粍浠躲€傞渶瑕佺紪紼嬪拰浠ｇ爜闆嗘垚銆?/li></li><li><a href="http://visualwebsiteoptimizer.com/">Visual Website Optimizer</a> 涓€涓槗浜庝嬌鐢ㄧ殑A / B嫻嬭瘯宸ュ叿錛屽寘鍚竴浜涘厛榪涚殑鍔熻兘錛屽鎵€瑙佸嵆鎵€寰楃殑緙栬緫鍣紝鍗曞嚮鍦板浘錛岃闂€呭垎鍓插拰鏍囩絳夈€?/li></li><li><a>Unbounce</a> and <a>Performable</a> 闆嗘垚鐫€闄嗛〉璁捐鐨凙 / B嫻嬭瘯宸ュ叿銆?/li></li><li><a>Vertster</a>, <a>SiteSpect</a>, <a>Webtrends Optimize</a> and <a>Omniture’s Test&Target</a> 浼佷笟綰ф祴璇曞伐鍏楓€?/li></li></ul> 涓€浜涙繁鍏ョ爺絀剁殑A/B嫻嬭瘯璧勬枡 濡傛灉浣犲凡緇忚鍒拌繖閲岋紝閭ｄ箞A / B嫻嬭瘯澶ф宸茬粡嬋€璧蜂綘鐨勫叴瓚ｃ€傚湪榪欓噷錛屾湁涓€浜涢潪甯稿ソ鐨凙/B嫻嬭瘯璧勬簮銆?/p> 瀵繪壘浣犱笅涓€涓狝/B嫻嬭瘯鐨勭伒鎰?/strong> <ul><li><a>Which Test Won?</a> 涓€涓寽嫻嬮偅縐嶆儏鍐典細(xì)鏈€緇堣儨鍒╃殑娓告垙銆?/li></li><li><a>101 A/B Testing Tips</a> 澶ч噺鐨凙/B嫻嬭瘯鎶€宸у拰鏂規(guī)硶銆?/li></li><li><a>ABtests.com</a> 涓€涓彲浠ュ垎浜拰闃呰A/B嫻嬭瘯緇撴灉鐨勫湴鏂廣€?/li></li><li><a href="http://visualwebsiteoptimizer.com/ideafox.php">A/B Ideafox</a> 鎼滅儲(chǔ)寮曟搸鐨凙 / B鍜屽鍙橀噺鐨勬渚嬬爺絀躲€?/li></li></ul> 涓€浜涗粙緇嶆€ф枃绔?/strong> <ul><li><a>Effective A/B Testing</a> By Ben Tilly.</li><li><a>Practical Guide to Controlled Experiments on the Web</a> (PDF) From Microsoft Research.</li><li><a>Introduction to A/B Testing</a> From the 20bits blog</li></ul> A/B嫻嬭瘯涓殑鏁板 <ul><li><a>Statistics for A/B Testing</a> From the 20bits blog.</li><li><a>How Not to Do A/B Testing</a></li><li><a href="http://visualwebsiteoptimizer.com/split-testing-blog/what-you-really-need-to-know-about-mathematics-of-ab-split-testing/">What You Should Know About the Mathematics of A/B Testing</a> From my own blog.</li><li><a>Easy Statistics for AdWords A/B Testing, and Hamsters</a></li><li><a>Statistical Significance and Other A/B Test Pitfalls</a></li></ul> 鍘熸枃鍦板潃錛?a >http://www.smashingmagazine.com/2010/06/24/the-ultimate-guide-to-a-b-testing/ 杞澆鑷細(xì)<a>http://ucdchina.com/snap/7203</a> <div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2012-08-28 11:41 <a href="http://www.aygfsteel.com/freeman1984/archive/2012/08/28/386419.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]> </article> <article> <h1>apache鎬ц兘嫻嬭瘯宸ュ叿ab</h1> 鐤媯 — Tue, 13 Dec 2011 06:36:00 GMT 浣跨敤鏍煎紡錛?./ab [options] [http://]hostname[:port]/path 鍙傛暟璇存槑錛?br /> -n requests Number of requests to perform //鍦ㄦ祴璇曚細(xì)璇濅腑鎵€鎵ц鐨勮姹備釜鏁般€傞粯璁ゆ椂錛屼粎鎵ц涓€涓姹?/font> -c concurrency Number of multiple requests to make //涓€嬈′駭鐢熺殑璇鋒眰涓暟銆傞粯璁ゆ槸涓€嬈′竴涓€?/font> -t timelimit Seconds to max. wait for responses //嫻嬭瘯鎵€榪涜鐨勬渶澶х鏁般€傚叾鍐呴儴闅愬惈鍊兼槸-n 50000銆傚畠鍙互浣垮鏈嶅姟鍣ㄧ殑嫻嬭瘯闄愬埗鍦ㄤ竴涓浐瀹氱殑鎬繪椂闂翠互鍐呫€傞粯璁ゆ椂錛屾病鏈夋椂闂撮檺鍒躲€?br /> -p postfile File containing data to POST //鍖呭惈浜?jiǎn)闇€瑕丳OST鐨勬暟鎹殑鏂囦歡. -T content-type Content-type header for POSTing //POST鏁版嵁鎵€浣跨敤鐨凜ontent-type澶翠俊鎭€?/font> -v verbosity How much troubleshooting info to print //璁劇疆鏄劇ず淇℃伅鐨勮緇嗙▼搴?- 4鎴栨洿澶у€間細(xì)鏄劇ず澶翠俊鎭紝 3鎴栨洿澶у€煎彲浠ユ樉紺哄搷搴斾唬鐮?404, 200絳?, 2鎴栨洿澶у€煎彲浠ユ樉紺鴻鍛婂拰鍏朵粬淇℃伅銆?-V 鏄劇ず鐗堟湰鍙峰茍閫€鍑恒€?br /> -w Print out results in HTML tables //浠TML琛ㄧ殑鏍煎紡杈撳嚭緇撴灉銆傞粯璁ゆ椂錛屽畠鏄櫧鑹茶儗鏅殑涓ゅ垪瀹藉害鐨勪竴寮犺〃銆?br /> -i Use HEAD instead of GET // 鎵цHEAD璇鋒眰錛岃€屼笉鏄疓ET銆?/font> -x attributes String to insert as table attributes // -y attributes String to insert as tr attributes // -z attributes String to insert as td or th attributes // -C attribute Add cookie, eg. 'Apache=1234. (repeatable) //-C cookie-name=value 瀵硅姹傞檮鍔犱竴涓狢ookie:琛屻€傚叾鍏稿瀷褰㈠紡鏄痭ame=value鐨勪竴涓弬鏁板銆傛鍙傛暟鍙互閲嶅銆?/font> -H attribute Add Arbitrary header line, eg. 'Accept-Encoding: gzip' Inserted after all normal header lines. (repeatable) -A attribute Add Basic WWW Authentication, the attributes are a colon separated username and password. -P attribute Add Basic Proxy Authentication, the attributes are a colon separated username and password. //-P proxy-auth-username:password 瀵逛竴涓腑杞唬鐞嗘彁渚汢ASIC璁よ瘉淇′換銆傜敤鎴峰悕鍜屽瘑鐮佺敱涓€涓?闅斿紑錛屽茍浠ase64緙栫爜褰㈠紡鍙戦€併€傛棤璁烘湇鍔″櫒鏄惁闇€瑕?鍗? 鏄惁鍙戦€佷簡(jiǎn)401璁よ瘉闇€姹備唬鐮?錛屾瀛楃涓查兘浼?xì)琚彂閫併€?/font> -X proxy:port Proxyserver and port number to use -V Print version number and exit -k Use HTTP KeepAlive feature -d Do not show percentiles served table. -S Do not show confidence estimators and warnings. -g filename Output collected data to gnuplot format file. -e filename Output CSV file with percentages served -h Display usage information (this message) //-attributes 璁劇疆灞炴€х殑瀛楃涓? 緙洪櫡紼嬪簭涓湁鍚勭闈?rùn)鎬佸０鏄庣殑鍥哄畾闀垮害鐨勭紦鍐插尯銆傚彟澶栵紝瀵瑰懡浠よ鍙傛暟銆佹湇鍔″櫒鐨勫搷搴斿ご鍜屽叾浠栧閮ㄨ緭鍏ョ殑瑙ｆ瀽涔熷緢綆€鍗曪紝榪欏彲鑳戒細(xì)鏈変笉鑹悗鏋溿€傚畠娌℃湁瀹屾暣鍦板疄鐜癏TTP/1.x; 浠呮帴鍙楁煇浜?棰勬兂'鐨勫搷搴旀牸寮忋€?strstr(3)鐨勯綣佷嬌鐢ㄥ彲鑳戒細(xì)甯︽潵鎬ц兘闂錛屽嵆, 浣犲彲鑳芥槸鍦ㄦ祴璇昦b鑰屼笉鏄湇鍔″櫒鐨勬€ц兘銆? 鍙傛暟寰堝,涓€鑸垜浠敤 -c 鍜?-n 鍙傛暟灝卞彲浠ヤ簡(jiǎn). 渚嬪: ./ab -c 1000 -n 1000 <a>http://10.88.15.77/test.php</a> 榪欎釜琛ㄧず鍚屾椂澶勭悊1000涓姹傚茍榪愯1000嬈ndex.php鏂囦歡. #ab -c 1000 -n 1000 <a>http://10.88.15.77/test.php</a> Benchmarking 10.88.15.77 (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Completed 600 requests Completed 700 requests Completed 800 requests Completed 900 requests Finished 1000 requests Server Software: Apache/2.2.8 //騫沖彴apache 鐗堟湰2.2.8 Server Hostname: 10.88.15.77 //鏈嶅姟鍣ㄤ富鏈哄悕 Server Port: 80 //鏈嶅姟鍣ㄧ鍙?/font> Document Path: /test.php //嫻嬭瘯鐨勯〉闈㈡枃妗?/font> Document Length: 1018 bytes //鏂囨。澶у皬 Concurrency Level: 1000 //騫跺彂鏁?br />Time taken for tests: 8.188731 seconds //鏁翠釜嫻嬭瘯鎸佺畫鐨勬椂闂?/font> Complete requests: 1000 //瀹屾垚鐨勮姹傛暟閲?/font> Failed requests: 0 //澶辮觸鐨勮姹傛暟閲?/font> Write errors: 0 Total transferred: 1361581 bytes //鏁翠釜鍦烘櫙涓殑緗戠粶浼犺緭閲?/font> HTML transferred: 1055666 bytes //鏁翠釜鍦烘櫙涓殑HTML鍐呭浼犺緭閲?br />Requests per second: 122.12 [#/sec] (mean) //澶у鏈€鍏沖績(jī)鐨勬寚鏍囦箣涓€錛岀浉褰撲簬 LR 涓殑 姣忕浜嬪姟鏁?/span> 錛屽悗闈㈡嫭鍙蜂腑鐨?/span> mean 琛ㄧず榪欐槸涓€涓鉤鍧囧€?/span> Time per request: 8188.731 [ms] (mean) //澶у鏈€鍏沖績(jī)鐨勬寚鏍囦箣浜岋紝鐩稿綋浜?/span> LR 涓殑 騫沖潎浜嬪姟鍝嶅簲鏃墮棿 錛屽悗闈㈡嫭鍙蜂腑鐨?/span> mean 琛ㄧず榪欐槸涓€涓鉤鍧囧€?/span> Time per request: 8.189 [ms] (mean, across all concurrent requests) //姣忎釜璇鋒眰瀹為檯榪愯鏃墮棿鐨勫鉤鍧囧€?/font> Transfer rate: 162.30 [Kbytes/sec] received //騫沖潎姣忕緗戠粶涓婄殑嫻侀噺錛屽彲浠ュ府鍔╂帓闄ゆ槸鍚﹀瓨鍦ㄧ綉緇滄祦閲忚繃澶у鑷村搷搴旀椂闂村歡闀跨殑闂 Connection Times (ms) min mean[+/-sd] median max Connect: 4 646 1078.7 89 3291 Processing: 165 992 493.1 938 4712 Waiting: 118 934 480.6 882 4554 Total: 813 1638 1338.9 1093 7785 //緗戠粶涓婃秷鑰楃殑鏃墮棿鐨勫垎瑙ｏ紝鍚勯」鏁版嵁鐨勫叿浣撶畻娉曡繕涓嶆槸寰堟竻妤?/span> Percentage of the requests served within a certain time (ms) 50% 1093 66% 1247 75% 1373 80% 1493 90% 4061 95% 4398 98% 5608 99% 7368 100% 7785 (longest request) //鏁翠釜鍦烘櫙涓墍鏈夎姹傜殑鍝嶅簲鎯呭喌銆傚湪鍦烘櫙涓瘡涓姹傞兘鏈変竴涓搷搴旀椂闂達(dá)紝鍏朵腑50錛呯殑鐢ㄦ埛鍝嶅簲鏃墮棿灝忎簬1093 姣錛?0錛?鐨勭敤鎴峰搷搴旀椂闂村皬浜?247 姣錛屾渶澶х殑鍝嶅簲鏃墮棿灝忎簬7785 姣 鐢變簬瀵逛簬騫跺彂璇鋒眰錛宑pu瀹為檯涓婂茍涓嶆槸鍚屾椂澶勭悊鐨勶紝鑰屾槸鎸夌収姣忎釜璇鋒眰鑾峰緱鐨勬椂闂寸墖閫愪釜杞漿澶勭悊鐨勶紝鎵€浠ュ熀鏈笂絎竴涓猅ime per request鏃墮棿綰︾瓑浜庣浜屼釜Time per request鏃墮棿涔樹互騫跺彂璇鋒眰鏁?br />杞嚜錛?a >http://blog.sina.com.cn/s/blog_3c9872d00100dbox.html <div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2011-12-13 14:36 <a href="http://www.aygfsteel.com/freeman1984/archive/2011/12/13/366235.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]> </article> <article> <h1>select, iocp, epoll,kqueue鍙?qiáng)鍚効U岻/O澶嶇敤鏈哄埗</h1> 鐤媯 — Wed, 07 Dec 2011 05:45:00 GMT 棣栧厛錛屼粙緇嶅嚑縐嶅父瑙佺殑I/O妯″瀷鍙?qiáng)鍏跺尯鍒?/strong>錛屽涓嬶細(xì) <ul><li> blocking I/O</li><li> nonblocking I/O</li><li> I/O multiplexing (<tt>select</tt> and <tt>poll</tt>)</li><li> signal driven I/O (<tt>SIGIO</tt>)</li><li> asynchronous I/O (the POSIX <tt>aio_</tt>functions)</li></ul> blocking I/O 榪欎釜涓嶇敤澶氳В閲婂惂錛岄樆濉炲鎺ュ瓧銆備笅鍥炬槸瀹冭皟鐢ㄨ繃紼嬬殑鍥劇ず錛?/p> 閲嶇偣瑙ｉ噴涓嬩笂鍥撅紝涓嬮潰渚嬪瓙閮戒細(xì)璁插埌銆傞鍏坅pplication璋冪敤 recvfrom()杞叆kernel錛屾敞鎰弅ernel鏈?涓繃紼嬶紝wait for data鍜宑opy data from kernel to user銆傜洿鍒版渶鍚巆opy complete鍚庯紝recvfrom()鎵嶈繑鍥炪€傛榪囩▼涓€鐩存槸闃誨鐨勩€?/p> nonblocking I/O錛?/strong> 涓巄locking I/O瀵圭珛鐨勶紝闈為樆濉炲鎺ュ瓧錛岃皟鐢ㄨ繃紼嬪浘濡備笅錛?/p> 鍙互鐪嬭錛屽鏋滅洿鎺ユ搷浣滃畠錛岄偅灝辨槸涓疆璇€€傘€傜洿鍒板唴鏍哥紦鍐插尯鏈夋暟鎹€?/p> I/O multiplexing (select and poll) 鏈€甯歌鐨処/O澶嶇敤妯″瀷錛宻elect銆?/p> select鍏堥樆濉烇紝鏈夋椿鍔ㄥ鎺ュ瓧鎵嶈繑鍥炪€備笌blocking I/O鐩告瘮錛宻elect浼?xì)鏈変袱娆【p葷粺璋冪敤錛屼絾鏄痵elect鑳藉鐞嗗涓鎺ュ瓧銆?/p> signal driven I/O (SIGIO) 鍙湁UNIX緋葷粺鏀寔錛屾劅鍏磋叮鐨勮鏌ラ槄鐩稿叧璧勬枡 涓?strong>I/O multiplexing (select and poll)鐩告瘮錛屽畠鐨勪紭鍔挎槸錛屽厤鍘諱簡(jiǎn)select鐨勯樆濉炰笌杞錛屽綋鏈夋椿璺冨鎺ュ瓧鏃訛紝鐢辨敞鍐岀殑handler澶勭悊銆?/p> asynchronous I/O (the POSIX aio_functions) 寰堝皯鏈?nix緋葷粺鏀寔錛寃indows鐨処OCP鍒欐槸姝ゆā鍨?/p> 瀹屽叏寮傛鐨処/O澶嶇敤鏈哄埗錛屽洜涓虹旱瑙備笂闈㈠叾瀹冨洓縐嶆ā鍨嬶紝鑷沖皯閮戒細(xì)鍦ㄧ敱kernel copy data to appliction鏃墮樆濉炪€傝€岃妯″瀷鏄綋copy瀹屾垚鍚庢墠閫氱煡application錛屽彲瑙佹槸綰紓姝?/font>鐨勩€傚ソ鍍忓彧鏈墂indows鐨?font color="#ff0000">瀹屾垚绔彛鏄繖涓ā鍨嬶紝鏁堢巼涔熷緢鍑?guó)檳层€?/p> 涓嬮潰鏄互涓婁簲縐嶆ā鍨嬬殑姣旇緝 鍙互鐪嬪嚭錛岃秺寰€鍚庯紝闃誨瓚婂皯錛岀悊璁轟笂鏁堢巼涔熸槸鏈€浼樸€?/p> =====================鍒嗗壊綰?================================= 5縐嶆ā鍨嬬殑姣旇緝姣旇緝娓呮櫚浜?jiǎn)锛屽墿涓嬬殑灏辨槸鎶妔elect,epoll,iocp,kqueue鎸夊彿鍏ュ駭閭ｅ氨O(jiān)K浜?jiǎn)銆?/p> select鍜宨ocp鍒嗗埆瀵瑰簲絎?縐嶄笌絎?縐嶆ā鍨嬶紝閭ｄ箞epoll涓巏queue鍛紵鍏跺疄涔熶簬select灞炰簬鍚屼竴縐嶆ā鍨嬶紝鍙槸鏇撮珮綰т竴浜涳紝鍙互鐪嬩綔鏈変簡(jiǎn)絎?縐嶆ā鍨嬬殑鏌愪簺鐗規(guī)€э紝濡俢allback鏈哄埗銆?/p> 閭ｄ箞錛屼負(fù)浠€涔坋poll,kqueue姣攕elect楂樼駭錛? </article> <article> <h1>nginx鍜宼omcat璐熻澆綆€鍗曢厤緗?windows鐜)</h1> 鐤媯 — Wed, 07 Dec 2011 02:40:00 GMT 闃呰鍏ㄦ枃 <div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2011-12-07 10:40 <a href="http://www.aygfsteel.com/freeman1984/archive/2011/12/07/365726.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]> </article> <article> <h1>楂樻€ц兘JavaScript(鏉ヨ嚜楂樻€ц兘JavaScript涓€涔?</h1> 鐤媯 — Sun, 09 Oct 2011 03:56:00 GMT <a id="ctl02_TitleUrl" class="postTitle2">楂樻€ц兘JavaScript</a> <div class="wmqeeuq" id="cnblogs_post_body"> 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UIQueue:涓婇潰鐨刄IThread璐熻矗鎵цUIQueue涓殑task錛屾棤璁虹敤鎴峰UI閲囧彇鐨勫姩浣滆Е鍙戠殑dom浜嬩歡鍝嶅簲鍑芥暟錛岃繕鏄痡avascript鎵ц榪囩▼涓敤setTimeout鎴杝etInterval鍒涘緩鐨勫畾鏃跺櫒浜嬩歡鍝嶅簲鍑芥暟錛岄兘浼?xì)琚彃鍏ュ埌UIQueue涓紝褰揢IThread澶勪簬busy鐘舵€佹椂錛屽彲鑳戒細(xì)蹇界暐鎺変竴浜泃ask錛屼笉緗叆UIQueue錛屾瘮濡傜敤鎴峰姩浣滅殑浜х敓鐨剈i鏇存柊task鍜岃Е鍙戠殑dom-event涓よ€咃紝ui鏇存柊鐨則ask浼?xì)琚拷鐣ヤ笉鏀惧叆UIQueue錛岃€宒om-event浼?xì)鏀惧叆UIQueue絳夊緟UIThread澶勪簬idle鐘舵€佹椂鎵ц錛岃€宻etInterval鍑芥暟鐨勫懆鏈熸€у畾鏃跺櫒浜嬩歡錛屼細(xì)瑙哢IQueue涓槸鍚︽湁鐩稿悓鐨勪簨浠跺搷搴斿嚱鏁幫紝濡傛病鏈夋墠浼?xì)灏嗚task緗叆UIQueue銆?br />UIQueue鐨則ask鏉ユ簮錛?br />1) 鐢ㄦ埛鎿嶄綔浜х敓鐨剈i鏇存柊閲嶇粯 2) 鐢ㄦ埛鎿嶄綔瑙﹀彂鐨勭粦瀹氬湪dom涓婄殑javascript浜嬩歡 3) dom鑺傜偣鑷韓鐘舵€佹敼鍙樿Е鍙戠殑緇戝畾鍦ㄨ嚜韜笂鐨刯avascript浜嬩歡錛屽鐨刼nload 4) setTimeout涓巗etInterval璁劇疆鐨勫畾鏃跺櫒浜嬩歡 5) ajax榪囩▼涓殑onreadystatechange浜嬩歡錛岃繖涓猨avascript鍑芥暟騫墮潪緇戝畾鍦╠om涓婏紝鑰屾槸緇戝畾鍦▁mlHttpRequest瀵硅薄涓?/p> 嫻忚鍣ㄩ檺鍒訛細(xì)涓轟簡(jiǎn)閬垮厤鏌愪釜javascript浜嬩歡鍑芥暟鎵ц鏃墮棿榪囬暱錛屼竴鐩村崰鎹甎IThread錛屼粠鑰屽鑷寸敤鎴鋒搷浣滆Е鍙戠殑UIUpdate浠誨姟寰椾笉鍒版墽琛岋紝鍚勪釜嫻忚鍣ㄤ嬌鐢ㄤ笉鍚岀殑鏂規(guī)闄愬埗浜?jiǎn)鍗曚釜javascript浜嬩歡鍑芥暟鐨勬墽琛屾椂闂?br />1) ie:500涓囨潯錛屽湪娉ㄥ唽琛ㄦ湁璁劇疆 2) firefox: 10縐掞紝鍦ㄦ祻瑙堝櫒閰嶇疆璁劇疆涓?about:config->dom.max_script_run_time) 3) safari: 5縐掞紝鏃犳硶淇敼 4) chrome: 渚濊禆閫氱敤宕╂簝媯€(gè)嫻嬬郴緇?br />5) opera: 鏃?/p> 鐣岄潰澶氫箙鏃犲弽搴斾細(xì)璁╃敤鎴鋒棤娉曞繊鍙楋細(xì) 鏈€闀?00姣錛岀敤鎴風(fēng)殑鍔ㄤ綔涔嬪悗瓚呰繃100姣鐣岄潰娌℃湁鍋氬嚭鍝嶅簲錛岀敤鎴峰氨浼?xì)璁や给檱繁鍜岀晫闈㈠け鍘讳簡(jiǎn)鑱斁p匯€?/p> 2 鐢ㄥ畾鏃跺櫒璁╁嚭鏃墮棿鐗囨柇(鍒嗚В浠誨姟) 浠誨姟鍒嗚В榪囩▼錛氱敤鎴鋒棤娉曞繊鍙椾竴涓?0縐掔殑浠誨姟鍗犳嵁UI綰跨▼錛岃€岃嚜宸辯殑浠諱綍鎿嶄綔寰椾笉鍒板弽棣堬紝浜庢槸鎴戜滑鍙互灝嗚繖涓?0縐掔殑浠誨姟鍒嗕負(fù)200嬈?0姣鐨勪換鍔★紝姣忔墽琛?0姣錛岃鍑篣I綰跨▼鍘繪墽琛孶I闃熷垪涓殑鐣岄潰鏇存柊鐨勪換鍔★紝璁╃敤鎴峰強(qiáng)鏃跺緱鍒板弽棣堬紝鐒跺悗鍐嶆墽琛?0姣錛岀洿鍒版墽琛屽畬姣曘€?br />鍩轟簬澶у鏁伴暱鏃墮棿UI浠誨姟閮芥槸瀵規(guī)暟緇勭殑寰幆鎿嶄綔錛屼簬鏄垜浠彲浠ュ皢榪欎釜寰幆榪囩▼榪涜鎷嗚В錛岀ず渚嬩唬鐮侊細(xì) <div id="wmqeeuq" class="hl-surround"> <ol class="hl-main ln-show" title="Double click to hide line number."><li id="wmqeeuq" class="hl-firstline">function timedProcessArray(list, callback, complete, progress){</li><li> var total = list.length;</li><li> var curProgress = 0;</li><li> var preProgress = 0;</li><li> </li><li> (function(list, iteration){</li><li> var fn = arguments.callee;</li><li> var st = +new Date();</li><li> while(list.length && (+new Date() - st < 50) ){</li><li> iteration = callback(list.shift(), iteration);</li><li> }</li><li> if(list.length){</li><li> if(progress){ //濡傛灉闇€瑕佸榪涘害榪涜閫氱煡)</li><li> curProgress = 100 - (100 / total * list.length ^ 0);</li><li></li><li> if(curProgress != preProgress){</li><li> preProgress = curProgress;</li><li> progress(curProgress);</li><li> }</li><li> }</li><li> setTimeout(function(){</li><li> fn.call(null, list, iteration);</li><li> }, 25);</li><li> }else{</li><li> progress && progress(100);</li><li> complete && complete(iteration);</li><li> }</li><li> })(list.concat(),0);</li><li> </li><li>} </li></ol></div> 闃誨鍜岄潪闃誨(浠誨姟鍒嗗壊)鏂瑰紡鐨勭ず渚嬶紝:<a target="_blank">http://lichaosoft.net/case/progress.html</a> 3 web-workers 鍦╳eb-workers涔嬪墠錛宩avascript鏄病鏈夊綰跨▼鐨勶紝web-workers鏍囧噯甯︽潵浜?jiǎn)鐪熸鐨勫绾拷E嬶紝web-workers鏈潵鏄痟tml5鐨勪竴閮ㄥ垎錛岀幇鍦ㄥ凡緇忓垎紱誨嚭鍘繪垚涓虹嫭绔嬬殑瑙勮寖錛歨ttp://www.w3.org/TR/workers/ 鍜寃eb-workers涔嬮棿浠呰兘閫氳繃onmessage鍜宲ostMessage浜や簰銆?/p> 浣跨敤web-workers浠ヨ緟鍔╃嚎紼嬭繘琛岃綆楀茍鎷ユ湁榪涘害閫氱煡鐨勭ず渚嬶細(xì) <a target="_blank">http://lichaosoft.net/case/worker.html</a>錛堣浣跨敤鏀寔web-workers鐨刢hrome鎴杝afari嫻忚錛?/p> web-workers閫傜敤浜庨偅浜涙棤娉曟媶瑙ｇ殑浠誨姟錛屽鏁扮粍鐨勯亶鍘嗘槸涓€涓彲浠ヨ鎷嗚В鐨勪換鍔★紝瀵規(guī)爲(wèi)鐨勯亶鍘嗛€氳繃浣跨敤dfs鎴朾fs灝嗘爲(wèi)騫沖潶鍖栦負(fù)鏁扮粍鍚庝篃鍙互榪涜鎷嗚В錛屼笉鑳芥媶瑙ｇ殑浠誨姟: 1) 緙栫爜/瑙ｇ爜澶у瓧絎︿覆 2) 澶嶆潅鏁板榪愮畻 3) 澶ф暟緇勬帓搴?/p> 瓚呰繃100姣鐨勪換鍔★紝濡傛祻瑙堝櫒鏀寔web-workers錛屼紭鍏堜嬌鐢╳eb-workers錛屽涓嶆敮鎸佸垯浣跨敤timedProcessArray榪涜鍒嗗壊榪愯銆?/p> 娌℃湁浠諱綍javascript浠ｇ爜鐨勯噸瑕佸害楂樹簬鐢ㄦ埛浣撻獙錛岀敤鎴蜂綋楠屾槸鑷抽珮閲嶈鐨勶紝鏃犺濡備綍涓嶈兘璁╃敤鎴瘋寰楃晫闈㈠弽搴旈€熷害鎱€€?/p> 涓?AJAX 浠庡箍涔変笂鏉ョ湅錛孉JAX鏄寚涓嶉噸杞芥暣涓〉闈㈢殑鎯呭喌涓嬶紝涓庢湇鍔＄榪涜鏁版嵁浼犺緭錛岃В鏋愭暟鎹紝騫跺眬閮ㄥ埛鏂伴〉闈㈠尯鍩熺殑鏀瑰杽鐢ㄦ埛浣撻獙鐨勮涓猴紝閭ｄ箞鎴戜滑涓嬮潰浠嬬粛錛氭暟鎹紶杈擄紝鏁版嵁鏍煎紡銆?/p> 1 鏁版嵁浼犺緭 1) XHR: 鍒涘緩涓€涓猉MLHttpRequest瀵硅薄涓庢湇鍔＄閫氫俊 2) 鍔ㄦ€佽剼鏈敞鍏? 榪欐槸涓€涓猦ack錛屽垱寤轟竴涓猻cript鍏冪礌騫惰緗畇rc涓轟換鎰弖ri-A(鍙法鍩?錛屽彲鍦ㄩ〉闈腑鍏堝畾涔変竴涓暟鎹鐞嗗嚱鏁板function newsListProc(list){}錛岀劧鍚庡湪璇ri-A鎸囧悜鐨剆cript鏂囦歡涓皟鐢╪ewsListProc騫跺皢鏁版嵁浼犲叆錛岃繖欏規(guī)妧鏈篃縐頒負(fù)錛欽SON-P銆?br />3) mXHR: 灝嗗涓祫婧愭枃浠朵嬌鐢╔HR浼犺緭鍒版祻瑙堝櫒绔紝js璐熻矗瀵規(guī)暟鎹祦鍒嗗壊錛岀劧鍚巇ispath緇欎笉鍚岀被鍨嬭祫婧愭枃浠剁殑澶勭悊鍑芥暟 4) 嫻佸紡XHR: 鍦ㄦ敮鎸乺eadyState涓?鏃訛紝鍙闂凡瑙ｆ瀽濂界殑閮ㄥ垎xhr鏁版嵁錛屾棦鏄敮鎸佹祦寮廥HR錛屽彲榪涜嫻佸紡澶勭悊鏉ヤ紭鍖栨墽琛屾晥鐜囷紝鐩墠瀹為檯嫻嬭瘯ff3.6鏀寔錛岃€宨e6,7,8鍙?qiáng)chrome閮戒笉鏀寔嫻佸紡XHR銆?br />5) iframes: 寰呯畫 6) comet: 寰呯畫 娉?錛氬叧浜巑XHR鍜屾祦寮廥HR錛屾垜鍐欎簡(jiǎn)涓€涓猟emo鐢ㄦ潵婕旂ず澶氳祫婧愭枃浠跺悎騫訛紝鐢盭HR鍚戝鎴風(fēng)浼犺緭錛屽茍鍦ㄦ敮鎸佹祦寮廥HR鐨勬祻瑙堝櫒涓嬌鐢ㄦ祦寮廥HR錛孌EMO鍦板潃錛?/p> 娉?錛氱函綺圭殑鍙戦€佹暟鎹€屾棤闇€鎺ュ彈鏁版嵁錛屽彲鐢╞eacons鏂瑰紡錛岀被浼煎姩鎬佽剼鏈敞鍏ワ紝涓嶈繃鍒涘緩鐨勪笉鏄痵cript鍏冪礌錛岃€屾槸Image瀵硅薄錛屽茍璁劇疆src涓鴻璇鋒眰鐨刄RI錛屾墍浠ヨ繖縐嶆柟寮忓彧鑳戒嬌鐢℅ET鏂瑰紡錛屼唬鐮佺ず渚? <div id="wmqeeuq" class="hl-surround"> <ol class="hl-main ln-show" title="Double click to hide line number."><li id="wmqeeuq" class="hl-firstline">function keepalive(uri, delay){</li><li> var beacon, delay = delay || 1000,</li><li> timer = setTimeout(function(){</li><li> var fn = arguments.callee;</li><li> beacon = new Image();</li><li> beacon.onload = beacon.onerror = function(){</li><li> timer = setTimeout(fn, delay);</li><li> }</li><li> beacon.src = uri;</li><li> }, delay);</li><li> return function(){</li><li> console.log('stop');</li><li> clearTimeout(timer);</li><li> };</li><li>} </li></ol></div> 2 鏁版嵁鏍煎紡 1) XML: 浣跨敤responseXML瀵硅薄鐨刧etElementsByTagName,getElementById,node.getAttribute絳塧pi瀵箈ml鏂囨。榪涜瑙ｆ瀽錛屼篃鍙互鐢╔Path榪涜瑙ｆ瀽錛屾€ц兘鏇村ソ浜涳紝紜激鏄細(xì) (1) “緇撴瀯/鏁版嵁”姣?澶珮 (2) XPath鍦ㄦ敮鎸佸茍涓嶅箍娉?br />(3) 鏈€閲嶈鐨勫氨鏄渶瑕佸厛鐭ラ亾鍐呭鐨勮緇嗙粨鏋勶紝閽堝姣忎釜鏁版嵁緇撴瀯緙栧啓鐗瑰畾鐨勮В鏋愭柟娉?br />2) JSON: 鏈€騫挎硾鐨勬暟鎹牸寮忥紝瑙ｆ瀽鎬ц兘杈冧箣xml楂橈紝”緇撴瀯/鏁版嵁”姣斾綆錛屽浣跨敤緙╃暐灞炴€у悕鎴栧畬鍏ㄤ嬌鐢ㄥ灞傛暟緇勬牸寮忥紝緇撴瀯鏁版嵁姣旀洿浣庯紝浼犺緭鎬ц兘鏇撮珮 3) JSON-P: 鏃犻渶瑙ｆ瀽錛屽睘浜巎avascript鐨勬甯稿嚱鏁拌皟鐢紝鎬ц兘鏈€楂?br />4) HTML: 鏃犻渶瑙ｆ瀽錛屾湇鍔＄宸叉瀯閫犲ソ鐢ㄤ簬灞€閮ㄦ洿鏂扮殑html鏁版嵁錛岀洿鎺ョ敤innerHTML鏇存柊錛屾暟鎹粨鏋勬瘮澶珮錛屽帇鍔涜闆嗕腑鍦ㄦ湇鍔＄錛岀綉緇滀紶杈撴暟鎹噺楂?br />5) 鑷畾涔夊垎闅旂: 鎬ц兘鏈€楂橈紝緇撴瀯鏁版嵁姣旀渶浣庯紝瀵逛簬鎬ц兘瑕佹眰姣旇緝鑻涘埢鐨勭幆澧冧腑浣跨敤 闄?鍒涘緩xhr瀵硅薄鐨勪唬鐮侊細(xì) <div id="wmqeeuq" class="hl-surround"> <ol class="hl-main ln-show" title="Double click to hide line number."><li id="wmqeeuq" class="hl-firstline">function createXhrObject(){</li><li> if(window.XMLHttpRequest){</li><li> return new XMLHttpRequest();</li><li> }else{</li><li> var msxml_progid = [</li><li> 'MSXML2.XMLHTTP.6.0', //鏀寔readyState鐨?鐘舵€侊紝浣嗘鐘舵€佹椂璇誨彇responseText涓虹┖錛岃寰椾技涔庢病鎰忎箟銆傘€?/span></li><li> 'MSXML3.XMLHTTP',</li><li> 'Microsoft.XMLHTTP',</li><li> 'MSXML2.XMLHTTP.3.0'</li><li> ];</li><li> var req;</li><li> for(var i=0;i<msxml_progid.length;i++){</li><li> try{</li><li> req = new ActiveXObject(msxml_progid[i]);</li><li> break;</li><li> }catch(ex){}</li><li> }</li><li> return req;</li><li> }</li><li>} </li></ol></div> 浠庡瓧絎︽祦涓紓姝ヨВ鏋愭暟鎹殑宸ュ叿綾?/p> <div id="wmqeeuq" class="hl-surround"> <ol class="hl-main ln-show" title="Double click to hide line number."><li id="wmqeeuq" class="hl-firstline">/* </li><li>* @method StringStreamParser 嫻佸紡瀛楃涓插紓姝ヨВ鏋愮被</li><li>* @param onRow 瑙ｆ瀽鍑烘暟鎹鐨勫洖璋冨嚱鏁?/span></li><li>* @param RowSeperator 琛屽垎闅旂,榛樿'u0001'</li><li>* @param ColSeperator 鍒楀垎闅旂,榛樿'u0002'</li><li>/</li><li>function StringStreamParser(onRow, rowSeperator, colSeperator){</li><li> if (!(this instanceof arguments.callee)){</li><li> return new arguments.callee(onRow, rowSeperator, colSeperator);</li><li> }</li><li></li><li> var stream = ''; </li><li> rowSeperator = rowSeperator || 'u0001';</li><li> colSeperator = colSeperator || 'u0002';</li><li> </li><li> / @method write 鍚戝瓧絎︽祦鍐欏叆鍖?/span></li><li> * @param packet 鍐欏叆鐨勫寘</li><li> * @param lastPacket 鏄惁涓烘渶鍚庝竴涓寘錛岄粯璁alse</li><li> /</li><li> this.write = function(packet, lastPacket){</li><li> stream += packet;</li><li> var rowIdx = stream.indexOf(rowSeperator);</li><li> var colIdx,strRow, dataRow;</li><li> </li><li> while(rowIdx!==-1 || lastPacket){</li><li> </li><li> if(rowIdx===-1){ </li><li> strRow = stream.substr(0);</li><li> lastPacket = false;</li><li> }else{</li><li> strRow = stream.substr(0,rowIdx);</li><li> stream = stream.substr(rowIdx+1);</li><li> rowIdx = stream.indexOf(rowSeperator); </li><li> }</li><li> </li><li> dataRow = [];</li><li> while(colIdx = strRow.indexOf(colSeperator)){</li><li> if(colIdx !== -1){</li><li> dataRow.push(strRow.substr(0, colIdx));</li><li> strRow = strRow.substr(colIdx+1);</li><li> }else{</li><li> dataRow.push(strRow.substr(0));</li><li> break;</li><li> }</li><li> }</li><li> onRow.call(null, dataRow);</li><li> </li><li> }</li><li> }</li><li>} </li></ol></div> 3 鍏朵粬 鍦ㄧ‘瀹氫簡(jiǎn)鍚堥€傜殑鏁版嵁浼犺緭鎶€鏈紝鍜屾暟鎹紶杈撴牸寮忎箣鍚庯紝榪樺彲浠ラ噰鍙栦互涓嬫柟寮忛厡鎯呬紭鍖朼jax: 1) 緙撳瓨鏁版嵁: 鏈€蹇殑璇鋒眰錛屾槸涓嶈姹傦紝鏈変互涓嬩袱縐嶆柟寮忕紦瀛? (1) 瀵逛簬GET璇鋒眰錛屽湪response涓紝璁劇疆expires澶翠俊鎭紝嫻忚鍣ㄥ嵆浼?xì)灏嗘璇锋眰缂撳瓨锛寴q欑緙撳瓨鏄法浼?xì)璇濅篃鏄法椤甸潰鐨?br />(2) 鍦╦avascript涓紝浠rl浣滀負(fù)鍞竴鏍囪瘑絎︾紦瀛樿姹傚埌鐨勬暟鎹紝鏃犳硶璺ㄩ〉闈篃鏃犳硶璺ㄤ細(xì)璇濓紝浣嗗彲緙栫▼鎺у埗緙撳瓨榪囩▼錛堜笉鑳借法浼?xì)璇濅篃涓嶈兘璺宓闈㈠Q岃繖縐嶇紦瀛樺熀鏈笂鏄棤鎰忎箟鐨勶級(jí) 2) 鍦ㄥ繀瑕佺殑鏃跺€欙紝鐩存帴浣跨敤XHR瀵硅薄鑰岄潪ajax搴擄紝濡傞渶瑕佹祦寮忕殑鏁版嵁澶勭悊 鍏?甯歌緙栫爜涓殑鎬ц兘鎻愰珮鐐?br />1 閬垮厤鍙岄噸姹傚€? eval,Function,setTimeout鍜宻etInterval閮藉厑璁鎬紶鍏ュ瓧絎︿覆錛岃€屾鏃朵細(xì)鍒涘緩涓€涓柊鐨勭紪璇戝櫒鐨勫疄渚嬶紝灝嗕細(xì)瀵艱嚧寰堝ぇ鐨勬€ц兘鎹熷け銆?鍙﹀榪欎簺鏂瑰紡鎵ц浠ｇ爜鏃訛紝浠ｇ爜鐨勪綔鐢ㄥ煙鍦ㄥ悇涓祻瑙堝櫒涔熶笉灝界浉鍚岋紝瀹規(guī)槗鎺夊潙) 2 浣跨敤Object/Array鐨勭洿鎺ラ噺榪涜瀹氫箟(涓旂洿鎺ラ噺姣攏ew Object()鐒跺悗璁劇疆灞炴€ф洿鑺傜渷浠ｇ爜) 3 涓嶈璁╀唬鐮侀噸澶嶈繍琛?br />1) 寤惰繜瀹氫箟 <div id="wmqeeuq" class="hl-surround"> <ol class="hl-main ln-show" title="Double click to hide line number."><li id="wmqeeuq" class="hl-firstline"></li></ol></div> 2) 鏉′歡棰勫畾涔?br />4 灝介噺浣跨敤鍘熺敓javascript 杞澆鑷細(xì)<a>http://www.cnblogs.com/pansly/archive/2011/06/29/2093769.html</a></div><script type="text/javascript"> if ($ != jQuery) { $ = jQuery.noConflict(); } var isLogined = false; var cb_blogId = 78100; var cb_entryId = 2093769; var cb_blogApp = "pansly"; var cb_blogUserGuid = "3bd23d3f-827b-df11-ba8f-001cf0cd104b"; var cb_entryCreatedDate = '2011/6/29 21:16:00'; </script> <div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2011-10-09 11:56 <a href="http://www.aygfsteel.com/freeman1984/archive/2011/10/09/360260.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]> </article> <article> <h1>杞澆涓€綃囨枃绔爋racle鐨勪竴浜涙搷浣?/title><link>http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355643.html</link><dc:creator>鐤媯</dc:creator><author>鐤媯</author><pubDate>Wed, 03 Aug 2011 02:33:00 GMT</pubDate><guid>http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355643.html</guid><wfw:comment>http://www.aygfsteel.com/freeman1984/comments/355643.html</wfw:comment><comments>http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355643.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/freeman1984/comments/commentRss/355643.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/freeman1984/services/trackbacks/355643.html</trackback:ping><description><![CDATA[ 鎽樿: 杞嚜: http://renjie120.iteye.com/ 娉ㄦ剰:鏁版嵁搴撶増鏈槸10g,涓嶈繃澶ч儴鍒?i鐨勪篃閫傜敤,闂洖9i灝辨病鏈? 1.鏇劇粡涓嶅皬蹇?jī)鎶婂紑鍙戝簱鐨勬暟鎹簱琛ㄥ叏閮ㄥ垹闄わ紝褰撴椂鍚撶殑瑕佹銆傜粨鏋滄壘鍒頒笅闈㈢殑璇彞鎭㈠鍒頒簡(jiǎn)1涓皬鏃朵箣鍓嶇殑鏁版嵁錛佸緢綆€鍗曘€?娉ㄦ剰浣跨敤綆＄悊鍛樼櫥褰曠郴緇燂細(xì) select from 琛ㄥ悕 as of timestamp sysdate-1/12&... <a href='http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355643.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/freeman1984/aggbug/355643.html" width = "1" height = "1" /> <div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2011-08-03 10:33 <a href="http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355643.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>榪噕$sqlarea,v$sql鏌ヨ鏈€鍗犵敤璧勬簮鐨勬煡璇?/title><link>http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355634.html</link><dc:creator>鐤媯</dc:creator><author>鐤媯</author><pubDate>Wed, 03 Aug 2011 01:47:00 GMT</pubDate><guid>http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355634.html</guid><wfw:comment>http://www.aygfsteel.com/freeman1984/comments/355634.html</wfw:comment><comments>http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355634.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/freeman1984/comments/commentRss/355634.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/freeman1984/services/trackbacks/355634.html</trackback:ping><description><![CDATA[<div>浠嶸$SQLAREA涓煡璇㈡渶鍗犵敤璧勬簮鐨勬煡璇?/span></div> <div>select b.username username,a.disk_reads reads, a.executions exec,a.disk_reads/decode(a.executions,0,1,a.executions) rds_exec_ratio, a.sql_text Statement from v$sqlarea a,dba_users b where a.parsing_user_id=b.user_id and a.disk_reads > 100000 order by a.disk_reads desc;</div> <div>鐢╞uffer_gets鍒楁潵鏇挎崲disk_reads鍒楀彲浠ュ緱鍒板崰鐢ㄦ渶澶氬唴瀛樼殑sql璇彞鐨勭浉鍏充俊鎭€?/div> <div> </div> <div>V$SQL鏄唴瀛樺叡浜玈QL鍖哄煙涓凡緇忚В鏋愮殑SQL璇彞銆?/div> <div> 鍒楀嚭浣跨敤棰戠巼鏈€楂樼殑5涓煡璇細(xì) </div> <div>select sql_text,executions from (select sql_text,executions, rank() over (order by executions desc) exec_rank from v$sql) where exec_rank <=5;</div> <div>娑堣€楃鐩樿鍙栨渶澶氱殑sql top5錛?br />select disk_reads,sql_text from (select sql_text,disk_reads, dense_rank() over (order by disk_reads desc) disk_reads_rank from v$sql) where disk_reads_rank <=5;</div> <div> 鎵懼嚭闇€瑕佸ぇ閲忕紦鍐茶鍙栵紙閫昏緫璇伙級(jí)鎿嶄綔鐨勬煡璇細(xì) </div> <div>select buffer_gets,sql_text from (select sql_text,buffer_gets, dense_rank() over (order by buffer_gets desc) buffer_gets_rank from v$sql) where buffer_gets_rank<=5;</div><img src ="http://www.aygfsteel.com/freeman1984/aggbug/355634.html" width = "1" height = "1" /> <div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2011-08-03 09:47 <a href="http://www.aygfsteel.com/freeman1984/archive/2011/08/03/355634.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>JVM鍐呭瓨妯″瀷浠ュ強(qiáng)鍨冨溇鍥炴敹</h1> 鐤媯 — Tue, 08 Mar 2011 05:16:00 GMT JVM鍐呭瓨妯″瀷浠ュ強(qiáng)鍨冨溇鍥炴敹 鍐呭瓨鐢?Perm 鍜?Heap 緇勬垚. 鍏朵腑 Heap = {Old + NEW = { Eden , from, to } } 鍏蜂綋鍙煡鐪媕avavisualvm JVM鍐呭瓨妯″瀷涓垎涓ゅぇ鍧楋紝涓€鍧楁槸 NEW Generation, 鍙︿竴鍧楁槸Old Generation. 鍦∟ew Generation涓紝鏈変竴涓彨Eden鐨勭┖闂達(dá)紝涓昏鏄敤鏉ュ瓨鏀炬柊鐢熺殑瀵硅薄錛岃繕鏈変袱涓猄urvivor Spaces錛坒rom,to錛? 瀹冧滑鐢ㄦ潵瀛樻斁姣忔鍨冨溇鍥炴敹鍚庡瓨?gòu)z諱笅鏉ョ殑瀵硅薄銆傚湪Old Generation涓紝涓昏瀛樻斁搴旂敤紼嬪簭涓敓鍛藉懆鏈熼暱鐨勫唴瀛樺璞★紝榪樻湁涓狿ermanent Generation錛屼富瑕佺敤鏉ユ斁JVM鑷繁鐨勫弽灝勫璞★紝姣斿綾誨璞″拰鏂規(guī)硶瀵硅薄絳夈€? 鍨冨溇鍥炴敹鎻忚堪錛?/p> 鍦∟ew Generation鍧椾腑錛屽瀮鍦懼洖鏀朵竴鑸敤Copying鐨勭畻娉曪紝閫熷害蹇€傛瘡嬈C鐨勬椂鍊欙紝瀛樻椿涓嬫潵鐨勫璞￠鍏堢敱Eden鎷瘋礉鍒版煇涓猄urvivor Space, 褰揝urvivor Space絀洪棿婊′簡(jiǎn)鍚? 鍓╀笅鐨刲ive瀵硅薄灝辮鐩存帴鎷瘋礉鍒癘ld Generation涓幓銆傚洜姝わ紝姣忔GC鍚庯紝Eden鍐呭瓨鍧椾細(xì)琚竻絀恒€傚湪Old Generation鍧椾腑錛屽瀮鍦懼洖鏀朵竴鑸敤mark-compact鐨勭畻娉曪紝閫熷害鎱簺錛屼絾鍑忓皯鍐呭瓨瑕佹眰. 鍨冨溇鍥炴敹鍒嗗綰э紝0綰т負(fù)鍏ㄩ儴(Full)鐨勫瀮鍦懼洖鏀訛紝浼?xì)鍥炴敹OLD孌典腑鐨勫瀮鍦撅紱1綰ф垨浠ヤ笂涓洪儴鍒嗗瀮鍦懼洖鏀訛紝鍙細(xì)鍥炴敹NEW涓殑鍨冨溇錛屽唴瀛樻孩鍑洪€氬父鍙戠敓浜嶰LD孌墊垨Perm孌靛瀮鍦懼洖鏀跺悗錛屼粛鐒舵棤鍐呭瓨絀洪棿瀹圭撼鏂扮殑Java瀵硅薄鐨勬儏鍐點(diǎn)€?/p> 褰撲竴涓猆RL琚 闂椂錛屽唴瀛樼敵璇瘋繃紼嬪涓嬶細(xì) A. JVM浼?xì)璇曞浘湄?fù)鐩稿叧Java瀵硅薄鍦‥den涓垵濮嬪寲涓€鍧楀唴瀛樺尯鍩?br /> B. 褰揈den絀洪棿瓚沖鏃訛紝鍐呭瓨鐢寵緇撴潫銆傚惁鍒欏埌涓嬩竴姝?br /> C. JVM璇曞浘閲婃斁鍦‥den涓墍鏈変笉媧昏穬鐨勫璞★紙榪欏睘浜?鎴栨洿楂樼駭鐨勫瀮鍦懼洖鏀訛級(jí), 閲婃斁鍚庤嫢Eden絀洪棿浠嶇劧涓嶈凍浠ユ斁鍏ユ柊瀵硅薄錛屽垯璇曞浘灝嗛儴鍒咵den涓椿璺冨璞℃斁鍏urvivor鍖?br /> D. Survivor鍖鴻鐢ㄦ潵浣滀負(fù)Eden鍙?qiáng)OLD鐨勪腑闂翠氦鎹㈠尯鍩燂紝褰揙LD鍖虹┖闂磋凍澶熸椂錛孲urvivor鍖虹殑瀵硅薄浼?xì)琚U誨埌Old鍖猴紝鍚﹀垯浼?xì)琚繚鐣欏湪Survivor鍖?br /> E. 褰揙LD鍖虹┖闂翠笉澶熸椂錛孞VM浼?xì)鍦∣LD鍖鴻繘琛屽畬鍏ㄧ殑鍨冨溇鏀墮泦錛?綰э級(jí) F. 瀹屽叏鍨冨溇鏀墮泦鍚庯紝鑻urvivor鍙?qiáng)OLD鍖轟粛鐒舵棤娉曞瓨鏀句粠Eden澶嶅埗榪囨潵鐨勯儴鍒嗗璞★紝瀵艱嚧JVM鏃犳硶鍦‥den鍖轟負(fù)鏂板璞″垱寤哄唴瀛樺尯鍩燂紝鍒欏嚭鐜?#8221;out of memory閿欒” JVM璋冧紭寤鴻: ms/mx錛氬畾涔塝OUNG+OLD孌電殑鎬誨昂瀵革紝ms涓篔VM鍚姩鏃禮OUNG+OLD鐨勫唴瀛樺ぇ灝忥紱mx涓烘渶澶у彲鍗犵敤鐨刌OUNG+OLD鍐呭瓨澶у皬銆傚湪鐢ㄦ埛鐢熶駭鐜涓婁竴鑸皢榪欎袱涓€艱涓虹浉鍚岋紝浠ュ噺灝戣繍琛屾湡闂寸郴緇熷湪鍐呭瓨鐢寵涓婃墍鑺辯殑寮€閿€銆?br /> NewSize/MaxNewSize錛氬畾涔塝OUNG孌電殑灝哄錛孨ewSize涓篔VM鍚姩鏃禮OUNG鐨勫唴瀛樺ぇ灝忥紱MaxNewSize涓烘渶澶у彲鍗犵敤鐨刌OUNG鍐呭瓨澶у皬銆傚湪鐢ㄦ埛鐢熶駭鐜涓婁竴鑸皢榪欎袱涓€艱涓虹浉鍚岋紝浠ュ噺灝戣繍琛屾湡闂寸郴緇熷湪鍐呭瓨鐢寵涓婃墍鑺辯殑寮€閿€銆?br /> PermSize/MaxPermSize錛氬畾涔塒erm孌電殑灝哄錛孭ermSize涓篔VM鍚姩鏃禤erm鐨勫唴瀛樺ぇ灝忥紱MaxPermSize涓烘渶澶у彲鍗犵敤鐨凱erm鍐呭瓨澶у皬銆傚湪鐢ㄦ埛鐢熶駭鐜涓婁竴鑸皢榪欎袱涓€艱涓虹浉鍚岋紝浠ュ噺灝戣繍琛屾湡闂寸郴緇熷湪鍐呭瓨鐢寵涓婃墍鑺辯殑寮€閿€銆?br /> SurvivorRatio錛氳緗甋urvivor絀洪棿鍜孍den絀洪棿鐨勬瘮渚?/p> 鍐呭瓨婧㈠嚭鐨勫彲鑳芥€?/p> 1. OLD孌墊孩鍑?br /> 榪欑鍐呭瓨婧㈠嚭鏄渶甯歌鐨勬儏鍐典箣涓€錛屼駭鐢熺殑鍘熷洜鍙兘鏄細(xì) 1) 璁劇疆鐨勫唴瀛樺弬鏁拌繃灝?ms/mx, NewSize/MaxNewSize) 2) 紼嬪簭闂 鍗曚釜紼嬪簭鎸佺畫榪涜娑堣€楀唴瀛樼殑澶勭悊錛屽寰幆鍑犲崈嬈＄殑瀛楃涓插鐞嗭紝瀵瑰瓧絎︿覆澶勭悊搴斿緩璁嬌鐢⊿tringBuffer銆傛鏃朵笉浼?xì)鎶ュ唴瀛樻孩鍑洪敊锛屽嵈浼?xì)浣跨郴緇熸寔緇瀮鍦炬敹闆嗭紝鏃犳硶澶勭悊鍏跺畠璇鋒眰錛岀浉鍏抽棶棰樼▼搴忓彲閫氳繃Thread Dump鑾峰彇錛堣緋葷粺闂璇婃柇涓€绔狅級(jí)鍗曚釜紼嬪簭鎵€鐢寵鍐呭瓨榪囧ぇ錛屾湁鐨勭▼搴忎細(xì)鐢寵鍑犲崄涔冭嚦鍑犵櫨鍏嗗唴瀛橈紝姝ゆ椂JVM涔熶細(xì)鍥犳棤娉曠敵璇峰埌璧勬簮鑰屽嚭鐜板唴瀛樻孩鍑猴紝瀵規(guī)棣栧厛瑕佹壘鍒扮浉鍏沖姛鑳斤紝鐒跺悗浜や簣紼嬪簭鍛樹慨鏀癸紝瑕佹壘鍒扮浉鍏崇▼搴忥紝蹇呴』鍦ˋpache鏃ュ織涓鎵俱€?br /> 褰揓ava瀵硅薄浣跨敤瀹屾瘯鍚庯紝鍏舵墍寮曠敤鐨勫璞″嵈娌℃湁閿€姣侊紝浣垮緱JVM璁や負(fù)浠栬繕鏄椿璺冪殑瀵硅薄鑰屼笉榪涜鍥炴敹錛岃繖鏍風(fēng)瘡璁″崰鐢ㄤ簡(jiǎn)澶ч噺鍐呭瓨鑰屾棤娉曢噴鏀俱€傜敱浜庣洰鍓嶅競(jìng)闈笂榪樻病鏈夊緋葷粺褰卞搷灝忕殑鍐呭瓨鍒嗘瀽宸ュ叿錛屾晠姝ゆ椂鍙兘鍜岀▼搴忓憳涓€璧峰畾浣嶃€?/p> 2. Perm孌墊孩鍑?br /> 閫氬父鐢變簬Perm孌佃杞戒簡(jiǎn)澶ч噺鐨凷ervlet綾昏€屽鑷存孩鍑猴紝鐩墠鐨勮В鍐沖姙娉曪細(xì) 1) 灝哖ermSize鎵╁ぇ錛屼竴鑸?56M鑳藉婊¤凍瑕佹眰 2) 鑻ュ埆鏃犻€夋嫨錛屽垯鍙兘灝唖ervlet鐨勮礬寰勫姞鍒癈LASSPATH涓紝浣嗕竴鑸笉寤鴻榪欎箞澶勭悊 3. 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border-left: medium none; border-collapse: collapse; background: #f3f3f3; border-top: medium none; border-right: medium none" class="MsoTableGrid" border="1" cellspacing="0" cellpadding="0"> <tbody> <tr> <td style="border-bottom: medium none; border-left: medium none; padding-bottom: 0cm; padding-left: 5.4pt; width: 426.1pt; padding-right: 5.4pt; border-top: medium none; border-right: medium none; padding-top: 0cm" valign="top" width="568"> / 嫻嬭瘯浠ｇ爜1 - 鑰楁椂: 14.325縐?/span> / </td> </tr> <tr> <td style="border-bottom: medium none; border-left: medium none; padding-bottom: 0cm; padding-left: 5.4pt; width: 426.1pt; padding-right: 5.4pt; border-top: medium none; border-right: medium none; padding-top: 0cm" valign="top" width="568"> var str = ""; for (var i = 0; i < 50000; i++) { str += "xxxxxx"; } </td> </tr> </tbody> </table> 榪欐浠ｇ爜鑰楁椂14.325縐掞紝緇撴灉騫朵笉鐞嗘兂銆傜幇鍦ㄦ垜浠皢浠ｇ爜鏀逛負(fù)濡備笅鐨勫艦寮忥細(xì) <table style="border-bottom: medium none; border-left: medium none; border-collapse: collapse; background: #f3f3f3; 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element.appendChild(anchor); } } function addAnchors(element) { var anchor; for (var i = 0; i < 10; i ++) { anchor = document.createElement('a'); anchor.innerHTML = 'test'; element.appendChild(anchor); } } 瑙ｅ喅鏂規(guī) 瑕佽В鍐寵繖涓棶棰橈紝鎴戜滑瑕佸厛鍒涘緩涓€涓枃妗ｇ墖孌靛璞★紝鐒跺悗鎶婃瘡涓柊鍒涘緩鐨勮秴閾炬帴閮芥彃鍏ュ埌瀹冮噷闈㈠幓銆傚綋鎴戜滑鎶婃枃妗ｇ墖孌靛璞＄敤appendChild鍛戒護(hù)鎻掑叆鍒版寚瀹氱殑鑺傜偣鏃訛紝榪欎釜鏂囨。鐗囨瀵硅薄鐨勬墍鏈夊瓙鑺傜偣灝變竴璧瘋鎻掑叆鍒版寚瀹氱殑鍏冪礌閲岄潰錛岃€屼笖鍙渶瑕佽Е鍙戜竴嬈￠噸瑙ｆ瀽銆?/p> view plaincopy to clipboardprint? function addAnchors(element) { var anchor, fragment = document.createDocumentFragment(); for (var i = 0; i < 10; i ++) { anchor = document.createElement('a'); anchor.innerHTML = 'test'; fragment.appendChild(anchor); } element.appendChild(fragment); } 鏈枃鏉ヨ嚜CSDN鍗氬錛岃漿杞借鏍囨槑鍑哄錛歨ttp://blog.csdn.net/emu/archive/2010/03/01/5334583.aspx <div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2010-10-17 23:53 <a href="http://www.aygfsteel.com/freeman1984/archive/2010/10/17/335395.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]> </article> <article> <h1>Tomcat鍐呭瓨婧㈠嚭鐨勪笁縐嶆儏鍐靛強(qiáng)瑙ｅ喅鍔炴硶鍒嗘瀽</h1> 鐤媯 — Sat, 16 Oct 2010 05:28:00 GMT  Tomcat鍐呭瓨婧㈠嚭鐨勫師鍥? 鍦ㄧ敓浜х幆澧冧腑tomcat鍐呭瓨璁劇疆涓嶅ソ寰堝鏄撳嚭鐜板唴瀛樻孩鍑恒€傞€犳垚鍐呭瓨鍘熷洜鏄笉涓€鏍風(fēng)殑錛屽綋鐒跺鐞嗘柟寮忎篃涓嶄竴鏍楓€?/p> 榪欓噷鏍規(guī)嵁騫蟲椂閬囧埌鐨勬儏鍐靛拰鐩稿叧璧勬枡榪涜涓€涓€葷粨銆傚父瑙佺殑涓€鑸細(xì)鏈変笅闈笁縐嶆儏鍐碉細(xì) 1.OutOfMemoryError錛?Java heap space 2.OutOfMemoryError錛?PermGen space 3.OutOfMemoryError錛?unable to create new native thread. Tomcat鍐呭瓨婧㈠嚭瑙ｅ喅鏂規(guī) 瀵逛簬鍓嶄袱縐嶆儏鍐碉紝鍦ㄥ簲鐢ㄦ湰韜病鏈夊唴瀛樻硠闇茬殑鎯呭喌涓嬪彲浠ョ敤璁劇疆tomcat jvm鍙傛暟鏉ヨВ鍐熾€傦紙-Xms -Xmx -XX錛歅ermSize -XX錛歁axPermSize錛?/p> 鏈€鍚庝竴縐嶅彲鑳介渶瑕佽皟鏁存搷浣滅郴緇熷拰tomcat jvm鍙傛暟鍚屾椂璋冩暣鎵嶈兘杈懼埌鐩殑銆?/p> 絎竴縐嶏細(xì)鏄爢婧㈠嚭銆? 鍦↗VM涓鏋?8錛呯殑鏃墮棿鏄敤浜嶨C涓斿彲鐢ㄧ殑 Heap size 涓嶈凍2錛呯殑鏃跺€欏皢鎶涘嚭姝ゅ紓甯鎬俊鎭€?/p> 娌℃湁鍐呭瓨娉勯湶鐨勬儏鍐典笅錛岃皟鏁?Xms -Xmx鍙傛暟鍙互瑙ｅ喅銆?/p> -Xms錛氬垵濮嬪爢澶у皬 -Xmx錛氭渶澶у爢澶у皬 浣嗗爢鐨勫ぇ灝忓彈涓嬮潰涓夋柟闈㈠獎(jiǎng)鍝嶏細(xì) 1.鐩稿叧鎿嶄綔緋葷粺鐨勬暟鎹ā鍨嬶紙32-bt榪樻槸64-bit錛夐檺鍒訛紱錛?2浣嶇郴緇熶笅錛屼竴鑸檺鍒跺湪1.5G~2G錛涙垜鍦?003 server 緋葷粺涓嬶紙鐗╃悊鍐呭瓨錛?G鍜?G錛宩dk錛?.6錛夋祴璇?1612M錛?4涓烘搷浣滅郴緇熷鍐呭瓨鏃犻檺鍒躲€傦級(jí) 2.緋葷粺鐨勫彲鐢ㄨ櫄鎷熷唴瀛橀檺鍒訛紱 3.緋葷粺鐨勫彲鐢ㄧ墿鐞嗗唴瀛橀檺鍒躲€?/p> 鍫嗙殑澶у皬鍙互浣跨敤 java -Xmx*M version 鍛戒護(hù)鏉ユ祴璇?銆傛敮鎸佺殑璇濅細(xì)鍑虹幇jdk鐨勭増鏈彿錛屼笉鏀寔浼?xì)鎶ラ敊銆?/p> -Xms -Xmx涓€鑸厤緗垚涓€鏍鋒瘮杈冨ソ姣斿set JAVA_OPTS= -Xms1024m -Xmx1024m 絎簩縐嶏細(xì)姘鎬箙淇濆瓨鍖哄煙婧㈠嚭 PermGen space鐨勫叏縐版槸Permanent Generation space錛屾槸鎸囧唴瀛樼殑姘鎬箙淇濆瓨鍖哄煙銆傝繖涓€閮ㄥ垎鐢ㄤ簬瀛樻斁Class鍜孧eta鐨勪俊鎭紝Class鍦ㄨ Load鐨勬椂鍊欒鏀懼叆PermGen space鍖哄煙錛屽畠鍜屽拰瀛樻斁Instance鐨凥eap鍖哄煙涓嶅悓錛孏C錛圙arbage Collection錛変笉浼?xì)鍦ㄤ溉潹嬪簭杩愯鏈熷PermGen space榪涜娓呯悊錛屾墍浠ュ鏋滀綘鐨凙PP浼?xì)LOAD寰堝CLASS鐨勮瘽錛屽氨寰堝彲鑳藉嚭鐜癙ermGen space閿欒銆傝繖縐嶉敊璇父瑙佸湪web鏈嶅姟鍣?瀵笿SP榪涜pre compile鐨勬椂鍊欍€備絾鐩墠鐨刪ibernate鍜宻pring欏圭洰涓篃寰堝鏄撳嚭鐜拌繖鏍風(fēng)殑闂銆俬ttp://www.javaeye.com/topic/80620 ?page=1 鐨勫笘瀛愭湁璁ㄨ鐨勮繖涓棶棰樸€傚彲鑳芥槸鐢變簬榪欎簺妗嗘灦浼?xì)鍔ㄦ€乧lass錛岃€屼笖jvm鐨刧c鏄笉浼?xì)娓呯悊PemGen space鐨勶紝瀵艱嚧鍐呭瓨婧㈠嚭銆?/p> 榪欎竴涓竴鑸槸鍔犲ぇ-XX錛歅ermSize -XX錛歁axPermSize 鏉ヨВ鍐抽棶棰樸€?/p> -XX錛歅ermSize 姘鎬箙淇濆瓨鍖哄煙鍒濆澶у皬 -XX錛歅ermSize 姘鎬箙淇濆瓨鍖哄煙鍒濆鏈€澶у€?/p> 榪欎竴鑸粨鍚堢涓€鏉′嬌鐢紝姣斿 set JAVA_OPTS= -Xms1024m -Xmx1024m -XX錛歅ermSize=128M -XX錛歅ermSize=256M 鏈変竴鐐歸渶瑕佹敞鎰忥細(xì)java -Xmx***M version 鍛戒護(hù)鏉ユ祴璇曠殑鏈€澶у爢鍐呭瓨鏄?-Xmx涓?-XX錛歅ermSize鐨?鍜?姣斿緋葷粺鏀寔鏈€澶х殑jvm鍫嗗ぇ灝忎簨1.5G錛岄偅 -Xmx1024m -XX錛歅ermSize=768M 鏄棤娉曡繍琛岀殑銆?/p> 絎笁縐嶏細(xì)鏃犳硶鍒涘緩鏂扮殑綰跨▼銆? 榪欑鐜拌薄姣旇緝?yōu)畱瑙佸Q屼篃姣旇緝濂囨€紝涓昏鏄拰jvm涓庣郴緇熷唴瀛樼殑姣斾緥鏈夊叧銆?/p> 榪欑鎬簨鏄洜涓篔VM宸茬粡琚郴緇熷垎閰嶄簡(jiǎn)澶ч噺鐨勫唴瀛橈紙姣斿1.5G錛夛紝騫朵笖瀹冭嚦灝戣鍗犵敤鍙敤鍐呭瓨鐨勪竴鍗娿€傛湁浜哄彂鐜幫紝鍦ㄧ嚎紼嬩釜鏁板緢澶氱殑鎯呭喌涓嬶紝浣犲垎閰嶇粰JVM 鐨勫唴瀛樿秺澶氾紝閭ｄ箞錛屼笂榪伴敊璇彂鐢熺殑鍙兘鎬у氨瓚婂ぇ銆?/p> 浜х敓榪欑鐜拌薄鐨勫師鍥犲涓嬶紙浠庤繖涓猙log涓簡(jiǎn)瑙ｅ埌鍘熷洜錛歨ttp://hi.baidu.com/hexiong/blog/item/16dc9e518fb10c2542a75b3c.html 錛夛細(xì) 姣忎竴涓?2浣嶇殑榪涚▼鏈€澶氬彲浠ヤ嬌鐢?G鐨勫彲鐢ㄥ唴瀛橈紝鍥犱負(fù)鍙﹀2G琚搷浣滅郴緇熶繚鐣欍€傝繖閲屽亣璁句嬌鐢?.5G緇橨VM錛岄偅涔堣繕浣欎笅500M鍙敤鍐呭瓨銆傝繖500M鍐呭瓨涓殑涓€閮ㄥ垎蹇呴』鐢ㄤ簬緋葷粺dll鐨勫姞杞斤紝閭ｄ箞鐪熸鍓╀笅鐨勪篃璁稿彧鏈?00M錛岀幇鍦ㄥ叧閿殑鍦版柟鍑虹幇浜?jiǎn)锛?xì)褰撲綘浣跨敤Java 鍒涘緩涓€涓嚎紼嬶紝鍦↗VM鐨勫唴瀛橀噷涔熶細(xì)鍒涘緩涓€涓猅hread瀵硅薄錛屼絾鏄悓鏃朵篃浼?xì)鍦ㄦ搷浣溇p葷粺閲屽垱寤轟竴涓湡姝ｇ殑鐗╃悊綰跨▼錛堝弬鑰僇VM瑙勮寖錛夛紝鎿嶄綔緋葷粺浼?xì)鍦ㄤ綑涓嬬?00鍏嗗唴瀛橀噷鍒涘緩榪欎釜鐗╃悊綰跨▼錛岃€屼笉鏄湪JVM鐨?500M鐨勫唴瀛樺爢閲屽垱寤恒€傚湪jdk1.4閲屽ご錛岄粯璁ょ殑鏍堝ぇ灝忔槸256KB錛屼絾鏄湪jdk1.5閲屽ご錛岄粯璁ょ殑鏍堝ぇ灝忎負(fù)1M姣忕嚎紼嬶紝鍥犳錛屽湪浣欎笅400M鐨勫彲鐢ㄥ唴瀛橀噷杈規(guī)垜浠渶澶氫篃鍙兘鍒涘緩400涓彲鐢ㄧ嚎紼嬨€?/p> 榪欐牱緇撹灝卞嚭鏉ヤ簡(jiǎn)錛岃鎯沖垱寤烘洿澶氱殑綰跨▼錛屼綘蹇呴』鍑忓皯鍒嗛厤緇橨VM鐨勬渶澶у唴瀛樸€傝繕鏈変竴縐嶅仛娉曟槸璁㎎VM瀹夸富鍦ㄤ綘鐨凧NI浠ｇ爜閲岃竟銆?/p> 緇欏嚭涓€涓湁鍏寵兘澶熷垱寤虹嚎紼嬬殑鏈€澶т釜鏁扮殑浼扮畻鍏紡錛?/p> 錛圡axProcessMemory - JVMMemory - ReservedOsMemory錛?/ 錛圱hreadStackSize錛?= Number of threads 瀵逛簬jdk1.5鑰岃█錛屽亣璁炬搷浣滅郴緇熶繚鐣?20M鍐呭瓨錛?/p> 1.5GB JVM錛?錛?GB-1.5Gb-120MB錛?錛?MB錛?= ~380 threads 1.0GB JVM錛?錛?GB-1.0Gb-120MB錛?錛?MB錛?= ~880 threads 鍦?000/XP/2003鐨刡oot.ini閲屽ご鏈変竴涓惎鍔ㄩ€夐」錛屽ソ鍍忔槸錛?PAE /3G 錛屽彲浠ヨ鐢ㄦ埛榪涚▼鏈€澶у唴瀛樻墿鍏呰嚦3G錛岃繖鏃舵搷浣滅郴緇熷彧鑳藉崰鐢ㄦ渶澶?G鐨勮櫄瀛樸€傞偅鏍峰簲璇ュ彲浠ヨJVM鍒涘緩鏇村鐨勭嚎紼嬨€?/p> 鍥犳榪欑鎯呭喌闇€瑕佺粨鍚堟搷浣滅郴緇熻繘琛岀浉鍏寵皟鏁淬€?/p> 鍥犳錛氭垜浠渶瑕佺粨鍚堜笉鍚屾儏鍐靛tomcat鍐呭瓨鍒嗛厤榪涜涓嶅悓鐨勮瘖鏂墠鑳戒粠鏍規(guī)湰涓婅В鍐抽棶棰樸€?/p> 浠ヤ笂灝辨槸閽堝Tomcat鍐呭瓨婧㈠嚭鐨勫嚑縐嶈В鍐蟲柟妗堛€傛湰鏂囨潵鑷狦eorge鐨勫崥瀹細(xì)銆妕omcat鍐呭瓨婧㈠嚭鎬葷粨銆?/p> 鏈枃鏉ヨ嚜CSDN鍗氬錛岃漿杞借鏍囨槑鍑哄錛歨ttp://blog.csdn.net/Senton/archive/2010/07/01/5707446.aspx <div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2010-10-16 13:28 <a href="http://www.aygfsteel.com/freeman1984/archive/2010/10/16/335295.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]> </article> <article> <h1>Tomcat鍚姩鍒嗘瀽server.xml</h1> 鐤媯 — Mon, 11 Oct 2010 15:13:00 GMT  1 - Tomcat Server鐨勭粍鎴愰儴鍒? 1.1 - Server A Server element represents the entire Catalina servlet container. (Singleton) 1.2 - Service A Service element represents the combination of one or more Connector components that share a single Engine Service鏄繖鏍蜂竴涓泦鍚堬細(xì)瀹冪敱涓€涓垨鑰呭涓狢onnector緇勬垚錛屼互鍙?qiáng)涓€涓狤ngine錛岃礋璐ｅ鐞嗘墍鏈塁onnector鎵€鑾峰緱鐨勫鎴瘋姹?/font> 1.3 - Connector 涓€涓狢onnector灝嗗湪鏌愪釜鎸囧畾绔彛涓婁睛鍚鎴瘋姹傦紝騫跺皢鑾峰緱鐨勮姹備氦緇橢ngine鏉ュ鐞嗭紝浠嶦ngine澶勮幏寰楀洖搴斿茍榪斿洖瀹㈡埛 TOMCAT鏈変袱涓吀鍨嬬殑Connector錛屼竴涓洿鎺ヤ睛鍚潵鑷猙rowser鐨刪ttp璇鋒眰錛屼竴涓睛鍚潵鑷叾瀹僕ebServer鐨勮姹?br /> Coyote Http/1.1 Connector 鍦ㄧ鍙?080澶勪睛鍚潵鑷鎴穊rowser鐨刪ttp璇鋒眰 Coyote JK2 Connector 鍦ㄧ鍙?009澶勪睛鍚潵鑷叾瀹僕ebServer(Apache)鐨剆ervlet/jsp浠ｇ悊璇鋒眰 1.4 - Engine The Engine element represents the entire request processing machinery associated with a particular Service It receives and processes all requests from one or more Connectors and returns the completed response to the Connector for ultimate transmission back to the client Engine涓嬪彲浠ラ厤緗涓櫄鎷熶富鏈篤irtual Host錛屾瘡涓櫄鎷熶富鏈洪兘鏈変竴涓煙鍚?br /> 褰揈ngine鑾峰緱涓€涓姹傛椂錛屽畠鎶婅璇鋒眰鍖歸厤鍒版煇涓狧ost涓婏紝鐒跺悗鎶婅璇鋒眰浜ょ粰璇ost鏉ュ鐞?br /> Engine鏈変竴涓粯璁よ櫄鎷熶富鏈猴紝褰撹姹傛棤娉曞尮閰嶅埌浠諱綍涓€涓狧ost涓婄殑鏃跺€欙紝灝嗕氦緇欒榛樿Host鏉ュ鐞?/font> 1.5 - Host 浠ｈ〃涓€涓猇irtual Host錛岃櫄鎷熶富鏈猴紝姣忎釜铏氭嫙涓繪満鍜屾煇涓綉緇滃煙鍚岲omain Name鐩稿尮閰?br /> 姣忎釜铏氭嫙涓繪満涓嬮兘鍙互閮ㄧ講(deploy)涓€涓垨鑰呭涓猈eb App錛屾瘡涓猈eb App瀵瑰簲浜庝竴涓狢ontext錛屾湁涓€涓狢ontext path 褰揌ost鑾峰緱涓€涓姹傛椂錛屽皢鎶婅璇鋒眰鍖歸厤鍒版煇涓狢ontext涓婏紝鐒跺悗鎶婅璇鋒眰浜ょ粰璇ontext鏉ュ鐞?br /> 鍖歸厤鐨勬柟娉曟槸“鏈€闀垮尮閰?#8221;錛屾墍浠ヤ竴涓猵ath==""鐨凜ontext灝嗘垚涓鴻Host鐨勯粯璁ontext 鎵€鏈夋棤娉曞拰鍏跺畠Context鐨勮礬寰勫悕鍖歸厤鐨勮姹傞兘灝嗘渶緇堝拰璇ラ粯璁ontext鍖歸厤 1.6 - Context 涓€涓狢ontext瀵瑰簲浜庝竴涓猈eb Application錛屼竴涓猈eb Application鐢變竴涓垨鑰呭涓猄ervlet緇勬垚 Context鍦ㄥ垱寤虹殑鏃跺€欏皢鏍規(guī)嵁閰嶇疆鏂囦歡錛凜ATALINA_HOME/conf/web.xml鍜岋紕WEBAPP_HOME/WEB-INF/web.xml杞藉叆Servlet綾?br /> 褰揅ontext鑾峰緱璇鋒眰鏃訛紝灝嗗湪鑷繁鐨勬槧灝勮〃(mapping table)涓鎵劇浉鍖歸厤鐨凷ervlet綾?br /> 濡傛灉鎵懼埌錛屽垯鎵ц璇ョ被錛岃幏寰楄姹傜殑鍥炲簲錛屽茍榪斿洖 2 - Tomcat Server鐨勭粨鏋勫浘 3 - 閰嶇疆鏂囦歡錛凜ATALINA_HOME/conf/server.xml鐨勮鏄? 璇ユ枃浠舵弿榪頒簡(jiǎn)濡備綍鍚姩Tomcat Server   <Server port="8005" shutdown="SHUTDOWN" debug="0">  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" debug="0"/> <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" debug="0"/>  <GlobalNamingResources> ... ... ... ... </GlobalNamingResources>  <Service name="Tomcat-Standalone">  <Connector className="org.apache.coyote.tomcat4.CoyoteConnector" port="8080" minProcessors="5" maxProcessors="75" acceptCount="100" enableLookups="true" redirectPort="8443" debug="0" connectionTimeout="20000" useURIValidationHack="false" disableUploadTimeout="true" />  <Engine name="Standalone" defaultHost="localhost" debug="0">  <Logger className="org.apache.catalina.logger.FileLogger" .../>  <Realm className="org.apache.catalina.realm.UserDatabaseRealm" .../>  <Host name="localhost" debug="0" appBase="webapps" unpackWARs="true" autoDeploy="true">  <Logger className="org.apache.catalina.logger.FileLogger" .../>  <Context path="" docBase="mycontext" debug="0"/>  <Context path="/wsota" docBase="wsotaProject" debug="0"/> </Host> </Engine> </Service> </Server>  4 - Context鐨勯儴緗查厤緗枃浠秝eb.xml鐨勮鏄? 涓€涓狢ontext瀵瑰簲浜庝竴涓猈eb App錛屾瘡涓猈eb App鏄敱涓€涓垨鑰呭涓猻ervlet緇勬垚鐨?br /> 褰撲竴涓猈eb App琚垵濮嬪寲鐨勬椂鍊欙紝瀹冨皢鐢ㄨ嚜宸辯殑ClassLoader瀵硅薄杞藉叆“閮ㄧ講閰嶇疆鏂囦歡web.xml”涓畾涔夌殑姣忎釜servlet綾?br /> 瀹冮鍏堣澆鍏ュ湪錛凜ATALINA_HOME/conf/web.xml涓儴緗茬殑servlet綾?br /> 鐒跺悗杞藉叆鍦ㄨ嚜宸辯殑Web App鏍圭洰褰曚笅鐨刉EB-INF/web.xml涓儴緗茬殑servlet綾?br /> web.xml鏂囦歡鏈変袱閮ㄥ垎錛歴ervlet綾誨畾涔夊拰servlet鏄犲皠瀹氫箟 姣忎釜琚 澆鍏ョ殑servlet綾婚兘鏈変竴涓悕瀛楋紝涓旇濉叆璇ontext鐨勬槧灝勮〃(mapping table)涓紝鍜屾煇縐峌RL PATTERN瀵瑰簲 褰撹Context鑾峰緱璇鋒眰鏃訛紝灝嗘煡璇apping table錛屾壘鍒拌璇鋒眰鐨剆ervlet錛屽茍鎵ц浠ヨ幏寰楄姹傚洖搴?/font> 銆€銆€鍒嗘瀽涓€涓嬫墍鏈夌殑Context鍏變韓鐨剋eb.xml鏂囦歡錛屽湪鍏朵腑瀹氫箟鐨剆ervlet琚墍鏈夌殑Web App杞藉叆  <web-app>      <servlet> <servlet-name>default</servlet-name> <servlet-class> org.apache.catalina.servlets.DefaultServlet </servlet-class> <init-param> <param-name>debug</param-name> <param-value>0</param-value> </init-param> <init-param> <param-name>listings</param-name> <param-value>true</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet>  <servlet> <servlet-name>invoker</servlet-name> <servlet-class> org.apache.catalina.servlets.InvokerServlet </servlet-class> <init-param> <param-name>debug</param-name> <param-value>0</param-value> </init-param> <load-on-startup>2</load-on-startup> </servlet>  <servlet> <servlet-name>jsp</servlet-name> <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class> <init-param> <param-name>logVerbosityLevel</param-name> <param-value>WARNING</param-value> </init-param> <load-on-startup>3</load-on-startup> </servlet>    <servlet-mapping> <servlet-name>default</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>invoker</servlet-name> <url-pattern>/servlet/</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>jsp</servlet-name> <url-pattern>.jsp</url-pattern> </servlet-mapping>    ... ... ... ... </web-app>  5 - Tomcat Server澶勭悊涓€涓猦ttp璇鋒眰鐨勮繃紼? 鍋囪鏉ヨ嚜瀹㈡埛鐨勮姹備負(fù)錛?br /> <a href="http://localhost:8080/wsota/wsota_index.jsp">http://localhost:8080/wsota/wsota_index.jsp</a> 1) 璇鋒眰琚彂閫佸埌鏈満绔彛8080錛岃鍦ㄩ偅閲屼睛鍚殑Coyote HTTP/1.1 Connector鑾峰緱 2) Connector鎶婅璇鋒眰浜ょ粰瀹冩墍鍦ㄧ殑Service鐨凟ngine鏉ュ鐞嗭紝騫剁瓑寰呮潵鑷狤ngine鐨勫洖搴?/font> 3) Engine鑾峰緱璇鋒眰localhost/wsota/wsota_index.jsp錛屽尮閰嶅畠鎵€鎷ユ湁鐨勬墍鏈夎櫄鎷熶富鏈篐ost 4) Engine鍖歸厤鍒板悕涓簂ocalhost鐨凥ost錛堝嵆浣垮尮閰嶄笉鍒頒篃鎶婅姹備氦緇欒Host澶勭悊錛屽洜涓鴻Host琚畾涔変負(fù)璇ngine鐨勯粯璁や富鏈猴級(jí) 5) localhost Host鑾峰緱璇鋒眰/wsota/wsota_index.jsp錛屽尮閰嶅畠鎵€鎷ユ湁鐨勬墍鏈塁ontext 6) Host鍖歸厤鍒拌礬寰勪負(fù)/wsota鐨凜ontext錛堝鏋滃尮閰嶄笉鍒板氨鎶婅璇鋒眰浜ょ粰璺緞鍚嶄負(fù)""鐨凜ontext鍘誨鐞嗭級(jí) 7) path="/wsota"鐨凜ontext鑾峰緱璇鋒眰/wsota_index.jsp錛屽湪瀹冪殑mapping table涓鎵懼搴旂殑servlet 8) Context鍖歸厤鍒癠RL PATTERN涓?.jsp鐨剆ervlet錛屽搴斾簬JspServlet綾?/font> 9) 鏋勯€燞ttpServletRequest瀵硅薄鍜孒ttpServletResponse瀵硅薄錛屼綔涓哄弬鏁拌皟鐢↗spServlet鐨刣oGet鎴杁oPost鏂規(guī)硶 10)Context鎶婃墽琛屽畬浜?jiǎn)涔嬪悗鐨凥ttpServletResponse瀵硅薄榪斿洖緇橦ost 11)Host鎶奌ttpServletResponse瀵硅薄榪斿洖緇橢ngine 12)Engine鎶奌ttpServletResponse瀵硅薄榪斿洖緇機(jī)onnector 13)Connector鎶奌ttpServletResponse瀵硅薄榪斿洖緇欏鎴穊rowser 杞澆鑷細(xì)http://www.360doc.com/content/05/1116/10/2689_31126.shtml <div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2010-10-11 23:13 <a href="http://www.aygfsteel.com/freeman1984/archive/2010/10/11/334485.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]> </article> <article> <h1>Java铏氭嫙鏈哄弬鏁?-XX絳夌浉鍏沖弬鏁板簲鐢?/title><link>http://www.aygfsteel.com/freeman1984/archive/2010/10/11/334483.html</link><dc:creator>鐤媯</dc:creator><author>鐤媯</author><pubDate>Mon, 11 Oct 2010 15:03:00 GMT</pubDate><guid>http://www.aygfsteel.com/freeman1984/archive/2010/10/11/334483.html</guid><wfw:comment>http://www.aygfsteel.com/freeman1984/comments/334483.html</wfw:comment><comments>http://www.aygfsteel.com/freeman1984/archive/2010/10/11/334483.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/freeman1984/comments/commentRss/334483.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/freeman1984/services/trackbacks/334483.html</trackback:ping><description><![CDATA[ 瀹樻柟緲昏瘧鏂囨。瑙侊細(xì)<a >http://www.cnblogs.com/z-zw/archive/2010/09/30/1839394.html</a> 閫氬父錛屾垜浠負(fù)浜?jiǎn)閬垮厤鍐呭瓨婧㈠嚭绛夐棶棰樺Q岄渶瑕佽緗幆澧冨彉閲?br />JAVA_OPTS -Xms256M -Xmx512M 絳夛紝銆愬浜庢湇鍔″櫒錛屼竴鑸兘璁劇疆鎴愪竴鏍風(fēng)殑銆?br />浣嗘槸鏈夌殑鏃跺€欏彲鑳借繖鏍風(fēng)殑璁劇疆榪樹細(xì)涓嶈(姣斿錛屽綋Server搴旂敤紼嬪簭鍔犺澆杈冨綾繪椂錛屽嵆jvm鍔犺澆綾繪椂錛屾案涔呭煙涓殑瀵硅薄鎬ュ墽澧炲姞錛屼粠鑰屼嬌jvm涓嶆柇璋冩暣姘鎬箙鍩熷ぇ灝忥紝涓轟簡(jiǎn)閬垮厤璋冩暣)錛屼綘鍙互浣跨敤鏇村鐨勫弬鏁伴厤緗紝濡傦細(xì) java -Xms512m -Xmx512m -XX:PermSize=64m -XX:MaxPermSize=128m 鍏朵腑錛屼嬌鐢?nbsp; -XX:MaxPerSize鏍囧織鏉ュ鍔犳案涔呭煙鐨勫ぇ灝忥紝-XX:PerSize鏍囧織璁劇疆鍒濆鍊?/p> -XX 鍩轟簬 Sun 鐨?Java 2 Standard Edition錛圝2SE錛? 鏈夌敓鎴愬瀮鍦懼洖鏀跺姛鑳斤紝榪欏厑璁稿垎闅斿唴瀛樻睜浠ュ寘鍚笉鍚屾椂鏁堢殑瀵硅薄銆傚瀮鍦懼洖鏀跺驚鐜牴鎹椂鏁堟敹闆嗕笌鍏朵粬瀵硅薄褰兼鐙珛鐨勫璞°€備嬌鐢ㄥ叾浠栧弬鏁幫紝鎮(zhèn)ㄥ彲浠ュ崟鐙緗唴瀛樻睜鐨?澶у皬銆備負(fù)浜?jiǎn)瀹炵幇鏇村ソ鐨勬€ц兘錛屾?zhèn)ㄥ簲璇ュ鍖呭惈鐭湡瀛構(gòu)z誨璞＄殑姹犵殑澶у皬榪涜璁劇疆錛屼互浣胯姹犱腑鐨勫璞＄殑瀛樻椿鏃墮棿涓嶄細(xì)瓚呰繃涓€涓瀮鍦懼洖鏀跺驚鐜€傛柊鐢熸垚鐨勬睜鐨勫ぇ灝忕敱 NewSize 鍜?MaxNewSize 鍙傛暟紜畾銆?/p> 絎竴嬈″瀮鍦懼洖鏀跺驚鐜腑瀛樻椿涓嬫潵鐨勫璞¤漿縐誨埌鍙︿竴涓睜涓€傜敓榪樿€呮睜鐨勫ぇ灝忕敱鍙傛暟 SurvivorRatio 紜畾銆?濡傛灉鍨冨溇鍥炴敹鍙樻垚浜?jiǎn)鐡堕锛屾?zhèn)ㄥ彲浠ュ皾璇曞畾鍒剁敓鎴愭睜璁劇疆銆傝鐩戞帶鍨冨溇鍥炴敹緇熻淇℃伅錛屼嬌鐢?Tivoli Performance Viewer 涓殑瀵硅薄緇熻淇℃伅鎴?verbose:gc 閰嶇疆璁劇疆銆?杈撳叆涓嬪垪鍊鹼細(xì) -XX:NewSize (lower bound) -XX:MaxNewSize (upper bound) -XX:SurvivorRatio=NewRatioSize -XX:NewSize 320m 姝ゅ€艱澶у彲璋冨ぇ鏂板璞″尯錛屽噺灝慒ull GC嬈℃暟 -XX:+UseParNewGC 錛氱緝鐭璵inor鏀墮泦鐨勬椂闂?鍙敤鏉ヨ緗茍琛屾敹闆嗐€愬CPU銆?br />-XX:+ParallelGCThreads 鍙敤鏉ュ鍔犲茍琛屽害銆愬CPU銆?br />-XX:+UseParallelGC 璁劇疆鍚庡彲浠ヤ嬌鐢ㄥ茍琛屾竻闄ゆ敹闆嗗櫒銆愬CPU銆?Xss錛氭瘡涓嚎紼嬬殑Stack澶у皬 -verbose:gc 鏄劇ず鍨冨溇鏀墮泦淇℃伅 -Xloggc:gc.log 鎸囧畾鍨冨溇鏀墮泦鏃ュ織鏂囦歡 鍒氬垰浜?jiǎn)瑙ｅ埌鐨勪竴浜涘弬鏁幫紙寰呭疄璺墊祴璇曪級(jí) -Xmn錛歽oung generation鐨刪eap澶у皬錛屼竴鑸緗負(fù)Xmx鐨?銆?鍒嗕箣涓€ -XX:+UseConcMarkSweepGC 錛氱緝鐭璵ajor鏀墮泦鐨勬椂闂?br />鎻愮ず錛氭閫夐」鍦℉eap Size 姣旇緝澶ц€屼笖Major鏀墮泦鏃墮棿杈冮暱鐨勬儏鍐典笅浣跨敤鏇村悎閫?/p> 涓嬮潰鐨勫懡浠ゆ妸鏁翠釜鍫嗚緗垚128m錛屾柊鍩熸瘮鐜囪緗垚3錛屽嵆鏂板煙涓庢棫鍩熸瘮渚嬩負(fù)1錛?錛屾柊鍩熶負(fù)鍫嗙殑1/4鎴?2M錛?/p> java –Xms128m –Xmx128m –XX:NewRatio =3緙虹渷鍊間負(fù)錛歂ewSize=2m MaxNewSize=32m SurvivorRatio=2銆備絾鏄紝濡傛灉 JVM 鐨勫爢澶у皬澶т簬 1GB錛屽垯搴旇浣跨敤鍊鹼細(xì)-XX:newSize=640m -XX:MaxNewSize=640m -XX:SurvivorRatio=16錛屾垨鑰呭皢鍫嗙殑鎬誨ぇ灝忕殑 50% 鍒?60% 鍒嗛厤緇欐柊鐢熸垚鐨勬睜銆?/p> 涓句緥錛氭案涔呭煙榛樿澶у皬涓?m銆傝繍琛岀▼搴忔椂錛宩vm浼?xì)璋冩暣姘镐箙鍩熺殑澶畯浠ユ弧鑳鲩渶瑕併€傛瘡嬈¤皟鏁存椂錛宩vm浼?xì)瀵瑰爢杩涜涓€嬈″畬鍏ㄧ殑鍨冨溇鏀墮泦銆?/p> 浣跨敤-XX:MaxPerSize鏍囧織鏉ュ鍔犳案涔呭煙鐨勫ぇ灝忋€傚湪WebLogic Server搴旂敤紼嬪簭鍔犺澆杈冨綾繪椂錛岀粡甯擱渶瑕佸鍔犳案涔呭煙鐨勬渶澶у€箋€傚綋jvm鍔犺澆綾繪椂錛屾案涔呭煙涓殑瀵硅薄鎬ュ墽澧炲姞錛屼粠鑰屼嬌jvm涓嶆柇璋冩暣姘鎬箙鍩熷ぇ灝忋€備負(fù)浜?jiǎn)閬垮?璋冩暣錛屽彲浣跨敤-XX:PerSize鏍囧織璁劇疆鍒濆鍊箋€?br /> 涓嬮潰鎶婃案涔呭煙鍒濆鍊艱緗垚32m錛屾渶澶у€艱緗垚64m銆?br /> java -Xms512m -Xmx512m -Xmn128m -XX:PermSize=32m -XX:MaxPermSize=64m 榛樿鐘舵€佷笅錛孒otSpot鍦ㄦ柊鍩熶腑浣跨敤澶嶅埗鏀墮泦鍣ㄣ€傝鍩熶竴鑸垎涓轟笁涓儴鍒嗐€傜涓€閮ㄥ垎涓篍den錛岀敤浜庣敓鎴愭柊鐨勫璞°€傚彟涓ら儴鍒嗙О涓烘晳鍔╃┖闂達(dá)紝褰揈den鍏?婊℃椂錛屾敹闆嗗櫒鍋滄搴旂敤紼嬪簭錛屾妸鎵€鏈夊彲鍒拌揪瀵硅薄澶嶅埗鍒板綋鍓嶇殑from鏁戝姪絀洪棿錛屼竴鏃﹀綋鍓嶇殑from鏁戝姪絀洪棿鍏呮弧錛屾敹闆嗗櫒鍒欐妸鍙埌杈懼璞″鍒跺埌褰撳墠鐨則o鏁戝姪絀洪棿銆侳rom鍜宼o鏁戝姪絀洪棿浜掓崲瑙掕壊銆傜淮鎸佹椿鍔ㄧ殑瀵硅薄灝嗗湪鏁戝姪絀洪棿涓嶆柇澶嶅埗錛岀洿鍒板畠浠幏寰椾嬌鐢ㄦ湡騫惰漿鍏ユ棫鍩熴€備嬌鐢?XX:SurvivorRatio鍙?鎺у埗鏂板煙瀛愮┖闂寸殑澶у皬銆?/p> 鐩墠錛屾垜鐨勭殑寮€鍙戠幆澧?2G鍐呭瓨錛宼omcat+eclipse 澶у瀷搴旂敤紼嬪簭 java -Xmx1024m -XX:PermSize=512m 鍩烘湰灝眔k澶ч儴鍒嗗簲鐢ㄤ簡(jiǎn) 鎴戠殑鏈嶅姟鍣ㄥ弬鏁伴厤緗? MY_PARAMS="-Xmn340m -Xss128k -XX:NewSize=640m -XX:MaxNewSize=640m -XX:PermSize=512m -XX:MaxPermSize=512m -XX:+UseParNewGC -Xloggc:gc.log" 鏈枃鍑哄錛歨ttp://hi.baidu.com/china8jie/blog/item/7c4ac1a2e25a9fa5caefd0d1.html <ol><li>甯歌閰嶇疆姹囨€?/strong> </li><li>鍫嗚緗? <ul><li>-Xms :鍒濆鍫嗗ぇ灝?</li><li>-Xmx :鏈€澶у爢澶у皬 </li><li>-XX:NewSize=n :璁劇疆騫磋交浠ｅぇ灝?</li><li>-XX:NewRatio=n: 璁劇疆騫磋交浠ｅ拰騫磋€佷唬鐨勬瘮鍊箋€傚:涓?錛岃〃紺哄勾杞諱唬涓庡勾鑰佷唬姣斿€間負(fù)1錛?錛屽勾杞諱唬鍗犳暣涓勾杞諱唬騫磋€佷唬鍜岀殑1/4 </li><li>-XX:SurvivorRatio=n :騫磋交浠ｄ腑Eden鍖轟笌涓や釜Survivor鍖虹殑姣斿€箋€傛敞鎰廠urvivor鍖烘湁涓や釜銆傚錛?錛岃〃紺篍den錛歋urvivor=3錛?錛屼竴涓猄urvivor鍖哄崰鏁翠釜騫磋交浠ｇ殑1/5 </li><li>-XX:MaxPermSize=n :璁劇疆鎸佷箙浠ｅぇ灝?/li></ul></li><li>鏀墮泦鍣ㄨ緗? <ul><li>-XX:+UseSerialGC :璁劇疆涓茶鏀墮泦鍣?</li><li>-XX:+UseParallelGC :璁劇疆騫惰鏀墮泦鍣?</li><li>-XX:+UseParalledlOldGC :璁劇疆騫惰騫磋€佷唬鏀墮泦鍣?</li><li>-XX:+UseConcMarkSweepGC :璁劇疆騫跺彂鏀墮泦鍣?/li></ul></li><li>鍨冨溇鍥炴敹緇熻淇℃伅 <ul><li>-XX:+PrintGC </li><li>-XX:+PrintGCDetails </li><li>-XX:+PrintGCTimeStamps </li><li>-Xloggc:filename </li></ul></li><li>騫惰鏀墮泦鍣ㄨ緗? <ul><li>-XX:ParallelGCThreads=n :璁劇疆騫惰鏀墮泦鍣ㄦ敹闆嗘椂浣跨敤鐨凜PU鏁般€傚茍琛屾敹闆嗙嚎紼嬫暟銆?</li><li>-XX:MaxGCPauseMillis=n :璁劇疆騫惰鏀墮泦鏈€澶ф殏鍋滄椂闂?</li><li>-XX:GCTimeRatio=n :璁劇疆鍨冨溇鍥炴敹鏃墮棿鍗犵▼搴忚繍琛屾椂闂寸殑鐧懼垎姣斻€傚叕寮忎負(fù)1/(1+n)</li></ul></li><li>騫跺彂鏀墮泦鍣ㄨ緗? <ul><li>-XX:+CMSIncrementalMode :璁劇疆涓哄閲忔ā寮忋€傞€傜敤浜庡崟CPU鎯呭喌銆?</li><li>-XX:ParallelGCThreads=n :璁劇疆騫跺彂鏀墮泦鍣ㄥ勾杞諱唬鏀墮泦鏂瑰紡涓哄茍琛屾敹闆嗘椂錛屼嬌鐢ㄧ殑CPU鏁般€傚茍琛屾敹闆嗙嚎紼嬫暟銆?/li></ul></li></ol> <img src ="http://www.aygfsteel.com/freeman1984/aggbug/334483.html" width = "1" height = "1" /> <div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">鐤媯</a> 2010-10-11 23:03 <a href="http://www.aygfsteel.com/freeman1984/archive/2010/10/11/334483.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>Oracle 10g SQL 浼樺寲鍐嶅涔?/title><link>http://www.aygfsteel.com/freeman1984/archive/2010/10/10/334235.html</link><dc:creator>鐤媯</dc:creator><author>鐤媯</author><pubDate>Sun, 10 Oct 2010 15:52:00 GMT</pubDate><guid>http://www.aygfsteel.com/freeman1984/archive/2010/10/10/334235.html</guid><wfw:comment>http://www.aygfsteel.com/freeman1984/comments/334235.html</wfw:comment><comments>http://www.aygfsteel.com/freeman1984/archive/2010/10/10/334235.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/freeman1984/comments/commentRss/334235.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/freeman1984/services/trackbacks/334235.html</trackback:ping><description><![CDATA[ 浠?i鍒?0g錛孫racle涓嶆柇榪涘寲鑷繁鐨凷QL Tuning鏅鴻兘錛屼竴浜涚綾嶇駭鐨勪紭鍖栧彛璇€宸茬粡澶辨晥銆?br /> 浣嗘垜鍠滄澶辨晥錛屼笉鐢ㄨ鍙ｈ瘈錛屾搷涓猅oad for Oracle Xpert 錛屾寜鐓уぇ鏂瑰悜鑸掕垝鏈嶆湇鐨勮皟浼樻墠鏄埍鍋氱殑浜嬫儏銆?/p> 1.Excution Plan Excution Plan鏄渶鍩烘湰鐨勮皟浼樻蹇碉紝涓嶇浣犵殑璋冧紭鍚瑰緱濡備綍澶╄姳涔卞爼錛岀粨鏋滆繕鏄鐢盓xcution plan鏉ユ樉紺篛racle 鏈€緇堢敤浠€涔堢儲(chǔ)寮曘€佹寜浠€涔堥『搴忚繛鎺ュ悇琛紝Full Table Scan榪樻槸Access by Rowid Index錛岀摱棰堝湪浠€涔堝湴鏂廣€傚鏋滄病鏈夊畠鐨勬寚瀵鹼紝涓€鍒囪皟浼橀兘鏄挋鐨勩€?/p> 2.Toad for Oracle Xpert 鐢ㄥ畠鏉ヨ皟浼樺湪鐪熺殑濂借垝鏈嶃€俀uest 鍚炲茍浜?jiǎn)Lecco鍚庯紝灝嗗畠鏁村悎鍒頒簡(jiǎn)Toad 鐨凷QL Tunning閲岄潰錛氭渶娓呮櫚鐨勬墽琛岃鍒掓樉紺猴紝鑷姩鐢熸垚N鏉＄瓑浠稴QL銆佺粰鍑轟紭鍖栧緩璁紝涓嶅悓SQL鎵ц璁″垝鐨勫姣旓紝榪樻湁瀹為檯鎵ц鐨勯€昏緫璇匯€佺墿鐞嗚鏁版嵁絳夌瓑涓€鐩簡(jiǎn)鐒躲€?/p> 3.绱㈠紩 澶ч儴鍒嗙殑鎬ц兘闂鍏跺疄閮芥槸绱㈠紩搴旂敤鐨勯棶棰橈紝W(xué)here瀛愬彞銆丱rder By銆丟roup By 閮借鐢ㄥ埌绱㈠紩銆?br /> 涓€鑸紑鍙戜漢鍛樿涓哄皢绱㈠紩寤哄叏浜?jiǎn)灏卞彲浠ヤ笅鐝洖瀹朵簡(jiǎn)锛屽疄鍒櫂q樻湁棰囧鐨勬€濋噺鍜岄櫡闃便€?/p> 3.1 绱㈠紩鍒椾笂涓嶈榪涜璁＄畻 榪欐槸鏈€鏈€鏅亶鐨勫け鏁堥櫡闃憋紝姣斿where trunc(order_date)=trunc(sysdate), i+2>4銆傜儲(chǔ)寮曞け鏁堢殑鍘熷洜涔熺畝鍗曪紝绱㈠紩鏄拡瀵瑰師鍊煎緩鐨勪簩鍙夋爲(wèi)錛屼綘灝嗗垪鍊?3/4+2鎶樿吘涓€鐣悗錛屽師鏉ョ殑浜屽弶鏍?wèi)褰撶劧灏辩敤涓嶄笂浜?jiǎn)銆傝В鍐崇殑鏂規(guī)硶: 銆€ 1.銆€鎹㈡垚絳変環(huán)璇硶錛屾瘮濡倀runc(order_date) 鎹㈡垚 where order_date>trunc(sysdate)-1 and order_date<trunc(sysdate)+1銆€ 2. 鐗瑰埆涓鴻綆楀緩绔嬪嚱鏁扮儲(chǔ)寮?/p> create index 錛XXXX on shop_order(trunc(order_date)) 3. 灝嗚綆椾粠絳夊彿宸﹁竟縐誨埌鍙寵竟 銆€榪欐槸閽堝鏌愪簺鏃犲績(jī)涔嬪け鐨勭籂姝ｏ紝鎶奱2>4銆€鏀逛負(fù)a>4/2錛涙妸TO_CHAR(zip) = '94002' 鏀逛負(fù)zip = TO_NUMBER('94002'); 3.2 CBO涓庣儲(chǔ)寮曢€夋嫨鎬?br /> 寤轟簡(jiǎn)绱㈠紩涔熶笉涓€瀹氫細(xì)琚玂racle鐢ㄧ殑錛屽氨鍍忎釜鎸戦鐨勫瀛愩€傚熀浜庢垚鏈殑浼樺寲鍣?CBO, Cost-Based Optimizer)錛屼細(xì)鍏堢湅鐪嬭〃鐨勫ぇ灝忥紝榪樻湁绱㈠紩鐨勯噸澶嶅害錛屽啀鍐沖畾鐢ㄨ繕鏄笉鐢ㄣ€傝〃涓湁100 鏉¤褰曡€屽叾涓湁80 涓笉閲嶅鐨勭儲(chǔ)寮曢敭鍊? 榪欎釜绱㈠紩鐨勯€夋嫨鎬у氨鏄?0/100 = 0.8錛岀暀鎰廡oad閲屾樉紺虹儲(chǔ)寮曠殑Selective鍜孋ardinailty銆傚疄鍦ㄤ笉鍚瘽鏃訛紝灝辮鐢╤ints鏉ヨ皟鏁欍€?br /> 鍙﹀錛寃here璇彞瀛樺湪澶氭潯绱㈠紩鍙敤鏃訛紝鍙細(xì)閫夋嫨鍏朵腑涓€鏉°€傛墍浠ョ儲(chǔ)寮曚篃涓嶆槸瓚婂瓚婂ソ錛氾級(jí) 3.3 绱㈠紩閲嶅緩 浼犺涓暟鎹洿鏂伴綣佸鑷存湁20%鐨勭鐗囨椂錛孫racle灝變細(xì)鏀懼純榪欎釜绱㈠紩銆傚畞鍙俊鍏舵湁涔嬩笅錛屽簲璇ユ椂甯竌lter index <INDEXNAME> rebuild涓€涓嬨€?/p> 3.4 鍏朵粬瑕佹敞鎰忕殑鍦版柟 涓嶈浣跨敤Not錛屽goods_no != 2錛岃鏀逛負(fù) where goods_no>2 or goods_no<2 涓嶈浣跨敤is null , 濡俉HERE DEPT_CODE IS NOT NULL 瑕佹敼涓?/p> WHERE DEPT_CODE >=0;3.5 select 鐨勫垪濡傛灉鍏ㄦ槸绱㈠紩鍒楁椂 鍙堝鏋滄病鏈墂here 鏉′歡錛屾垨鑰厀here鏉′歡鍏ㄩ儴鏄儲(chǔ)寮曞垪鏃訛紝Oracle 灝嗙洿鎺ヤ粠绱㈠紩閲岃幏鍙栨暟鎹€屼笉鍘昏鐪熷疄鐨勬暟鎹〃錛岃繖鏍峰瓙鐞嗚涓婁細(xì)蹇緢澶氾紝姣斿 select order_no,order_time from shop_order where shop_no=4褰搊rder_no,order_time,shop_no 榪欎笁鍒楀叏涓虹儲(chǔ)寮曞垪鏃訛紝浣犲皢鐪嬪埌涓€涓拰騫蟲椂瀹屽叏涓嶅悓鐨勬墽琛岃鍒掋€?/p> 3.6 浣嶅浘绱㈠紩 浼犺涓綋鏁版嵁鍊艱緝?yōu)畱锛屾瘮濡傛煇浜涜〃绀哄垎绫汇€佺姸鎬佺殑鍒楋紝搴旇寤轟綅鍥劇儲(chǔ)寮曡€屼笉鏄櫘閫氱殑浜屽弶鏍?wèi)鐑?chǔ)寮曪紝鍚﹀垯鏁堢巼浣庝笅銆備笉榪囩湅鎵ц璁″垝錛岃繖浜涗綅鍥劇儲(chǔ)寮曢矞鏈夎Oracle涓村垢鐨勩€?br /> 4.鍑忓皯鏌ヨ寰€榪斿拰鏌ヨ鐨勮〃 榪欎篃鏄緢綆€鍗曠殑澶ч亾鐞嗭紝紼嬪簭涓嶰racle浜や簰鐨勬垚鏈瀬楂橈紝鎵€浠ヤ竴涓煡璇㈣兘瀹屾垚鐨勪笉瑕佸垎寮€涓ゆ鏌ワ紝濡傛灉涓€涓驚鐜墽琛岋紤涓囨潯鏌ヨ鐨勶紝鎬庝箞閮藉揩涓嶅埌鍝噷鍘諱簡(jiǎn)銆?/p> 4.1 灝佽PL/SQL瀛樺偍榪囩▼ 銆€ 鏈€楂樼駭鐨勫仛娉曟槸鎶婂驚鐜殑鎿嶄綔灝佽鍒癙L/SQL鍐欑殑瀛樺偍榪囩▼閲岋紝鍥犱負(fù)瀛樺偍榪囩▼閮藉湪鏈嶅姟绔墽琛岋紝鎵€浠ユ病鏈夋暟鎹線榪旂殑娑堣€椼€?/p> 4.2 灝佽PL/SQL鍐呴儴鍑芥暟 鏈夋満浼?xì)锛尀畣涓€浜涙煡璇㈠皝瑁呭埌鍑芥暟閲岋紝鑰屽湪鏅€歋QL閲屼嬌鐢ㄨ繖浜涘嚱鏁幫紝鍚屾牱鏄緢鏈夋晥鐨勪紭鍖栥€?/p> 4.3 Decode/Case 銆€ 浣嗗瓨鍌ㄨ繃紼嬩篃楹葷儲(chǔ)錛屾墍浠ユ湁case/decode鎶婂嚑鏉℃潯浠跺熀鏈浉鍚岀殑閲嶅鏌ヨ鍚堝茍涓轟竴鏉＄殑鐢ㄦ硶錛?/p> SELECT COUNT(CASE WHEN price < 13 THEN 1 ELSE null END) low, COUNT(CASE WHEN price BETWEEN 13 AND 15 THEN 1 ELSE null END) med, COUNT(CASE WHEN price > 15 THEN 1 ELSE null END) high FROM products;4.4 涓€縐峎here/Update璇硶 SELECT TAB_NAME銆€FROM TABLES WHERE (TAB_NAME,DB_VER) = 錛? 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鐤媯 2010-09-15 23:39 鍙戣〃璇勮
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QQ 瀵艱嚧mysql 鏈嶅姟鏃犳硶鍚姩

鐤媯 — Mon, 06 Sep 2010 02:59:00 GMT

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Close_Wait鐘舵€佽В閲?/span>

CLOSE_WAIT鐘舵€佺殑鐢熸垚鍘熷洜
閫氳繃TCP鐨勭姸鎬佸浘鎴戜滑鍙互鐪嬪嚭鍙湁琚姩鍏抽棴鐨勪竴绔墠鏈塁LOSE_WAIT鐘舵€侊紝褰撴敹鍒癋in騫跺彂閫佷簡(jiǎn)Ack鍚?br /> 鏈嶅姟鍣ㄧ姸鎬佸氨鍙樻垚浜?jiǎn)CLOSE_WAIT鐘舵€侊紝濡傛灉鎴戜滑鐨勬湇鍔″櫒涓€鐩村浜嶤LOSE_WAIT鐘舵€佺殑璇濓紝璇存槑濂楁帴瀛楁槸琚姩鍏抽棴鐨勶紒錛屽茍涓旀病鏈夊彂閫丗in淇′護(hù)錛屽師鍥犲線寰€鏄病鏈夎皟鐢═CP鐨凜loseSocket銆?/p>

瑙ｅ喅CLOSE_WAIT鐨勬柟娉?
1 涓€鑸師鍥犻兘鏄疶CP榪炴帴娌℃湁璋冪敤鍏抽棴鏂規(guī)硶銆傞渶瑕佸簲鐢ㄦ潵澶勭悊緗戠粶閾炬帴鍏抽棴銆?br /> 2 瀵逛簬Web璇鋒眰鍑虹幇榪欎釜鍘熷洜錛岀粡甯告槸鍥犱負(fù)Response鐨凚odyStream娌℃湁璋冪敤Close.
姣斿Widnows涓?
浣跨敤HttpWebRequest 涓€瀹氳淇濊瘉GetRequestStream鍜孏etResponse瀵硅薄鍏抽棴錛屽惁鍒欏鏄撻€犳垚榪炴帴澶勪簬CLOSE_WAIT鐘舵€?br /> 3 TCP鐨凨eepLive鍔熻兘錛屽彲浠ヨ鎿嶄綔緋葷粺鏇挎垜浠嚜鍔ㄦ竻鐞嗘帀CLOSE_WAIT鐨勮繛鎺ャ€?br /> 浣嗘槸KeepLive鍦╓indows鎿嶄綔緋葷粺涓嬮粯璁ゆ槸7200縐掞紝涔熷氨鏄?涓皬鏃舵墠娓呯悊涓€嬈°€傚線寰€婊¤凍涓嶄簡(jiǎn)瑕佹眰銆傚彲浠ヨ皟?yōu)畯璇ユ暟鍊箋€?br /> Windows涓嬬殑璋冩暣鏂規(guī)硶涓?br /> HKEY_LOCAL_MACHINE"CurrentControlSet"Services"Tcpip"Parameters涓嬬殑浠ヤ笅涓変釜鍙傛暟錛?
KeepAliveInterval,璁劇疆鍏跺€間負(fù)1000
KeepAliveTime,璁劇疆鍏跺€間負(fù)300000(鍗曚綅涓烘縐掞紝300000浠ｈ〃5鍒嗛挓)
TcpMaxDataRetransmissions,璁劇疆鍏跺€間負(fù)5

Close_Wait寮曞彂鐨勯棶棰?
Close_Wait浼?xì)鍗犵敤涓€涓繛鎺ワ紝緗戠粶鍙敤榪炴帴灝忋€傛暟閲忚繃澶氾紝鍙兘浼?xì)寮曡碉L(fēng)綉緇滄€ц兘涓嬮檷錛屽茍鍗犵敤緋葷粺闈炴崲欏靛唴瀛樸€?灝ゅ叾鏄湪鏈夎繛鎺ユ睜鐨勬儏鍐典笅(姣斿HttpRequest)
浼?xì)鑰楀敖榪炴帴姹犵殑緗戠粶榪炴帴鏁幫紝瀵艱嚧鏃犳硶寤虹珛緗戠粶榪炴帴

--------------------------------------------
TCP鐘舵€佽漿縐昏鐐?br /> TCP鍗忚瑙勫畾錛屽浜庡凡緇忓緩绔嬬殑榪炴帴錛岀綉緇滃弻鏂硅榪涜鍥涙鎻℃墜鎵嶈兘鎴愬姛鏂紑榪炴帴錛屽鏋滅己灝戜簡(jiǎn)鍏朵腑鏌愪釜姝ラ錛屽皢浼?xì)鋴蓸q炴帴澶勪簬鍋囨鐘舵€侊紝榪炴帴鏈韓鍗犵敤鐨勮祫婧愪笉浼?xì)琚噴鏀俱€傜綉緇滄湇鍔″櫒紼嬪簭瑕佸悓鏃剁鐞嗗ぇ閲忚繛鎺ワ紝鎵€浠ュ緢鏈夊繀瑕佷繚璇佹棤鐢ㄨ繛鎺ュ畬鍏ㄦ柇寮€錛屽惁鍒欏ぇ閲忓兊姝葷殑榪炴帴浼?xì)娴垂璁稿鏈嶅姟鍣ㄨ祫婧愩€傚湪浼楀TCP鐘舵€佷腑錛屾渶鍊煎緱娉ㄦ剰鐨勭姸鎬佹湁涓や釜錛欳LOSE_WAIT鍜孴IME_WAIT銆?nbsp;

1銆丩ISTENING鐘舵€?br /> 銆€銆€FTP鏈嶅姟鍚姩鍚庨鍏堝浜庝睛鍚紙LISTENING錛夌姸鎬併€?br /> 2銆丒STABLISHED鐘舵€?br /> 銆€銆€ESTABLISHED鐨勬剰鎬濇槸寤虹珛榪炴帴銆傝〃紺轟袱鍙版満鍣ㄦ鍦ㄩ€氫俊銆?br /> 3銆丆LOSE_WAIT
瀵規(guī)柟涓誨姩鍏抽棴榪炴帴鎴栬€呯綉緇滃紓甯稿鑷磋繛鎺ヤ腑鏂紝榪欐椂鎴戞柟鐨勭姸鎬佷細(xì)鍙樻垚CLOSE_WAIT 姝ゆ椂鎴戞柟瑕佽皟鐢╟lose()鏉ヤ嬌寰楄繛鎺ユ紜叧闂?br /> 4銆乀IME_WAIT
鎴戞柟涓誨姩璋冪敤close()鏂紑榪炴帴錛屾敹鍒板鏂圭‘璁ゅ悗鐘舵€佸彉涓篢IME_WAIT銆俆CP鍗忚瑙勫畾TIME_WAIT鐘舵€佷細(xì)涓€鐩存寔緇?MSL(鍗充袱鍊嶇殑鍒嗘鏈€澶х敓瀛樻湡)錛屼互姝ゆ潵紜繚鏃х殑榪炴帴鐘舵€佷笉浼?xì)瀵规柊杩炴帴漶旂敓濯?jiǎng)鍝嶃€傚浜嶵IME_WAIT鐘舵€佺殑榪炴帴鍗犵敤鐨勮祫婧愪笉浼?xì)琚唴鏍搁噴鏀惧Q屾墍浠ヤ綔涓烘湇鍔″櫒錛屽湪鍙兘鐨勬儏鍐典笅錛屽敖閲忎笉瑕佷富鍔ㄦ柇寮€榪炴帴錛屼互鍑忓皯TIME_WAIT鐘舵€侀€犳垚鐨勮祫婧愭氮璐廣€?
鐩墠鏈変竴縐嶉伩鍏峊IME_WAIT璧勬簮嫻垂鐨勬柟娉曪紝灝辨槸鍏抽棴socket鐨凩INGER閫夐」銆備絾榪欑鍋氭硶鏄疶CP鍗忚涓嶆帹鑽愪嬌鐢ㄧ殑錛屽湪鏌愪簺鎯呭喌涓嬭繖涓搷浣滃彲鑳戒細(xì)甯︽潵閿欒銆?

璇︾粏涓€鐐圭殑鏂囨。錛?br /> http://apps.hi.baidu.com/share/detail/10908121

鐤媯 2010-09-06 10:59 鍙戣〃璇勮

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灝藉彲鑳戒嬌鐢ㄥ爢鏍堝彉閲?/title>http://www.aygfsteel.com/freeman1984/archive/2010/01/29/311223.html鐤媯鐤媯Fri, 29 Jan 2010 06:56:00 GMThttp://www.aygfsteel.com/freeman1984/archive/2010/01/29/311223.htmlhttp://www.aygfsteel.com/freeman1984/comments/311223.htmlhttp://www.aygfsteel.com/freeman1984/archive/2010/01/29/311223.html#Feedback0http://www.aygfsteel.com/freeman1984/comments/commentRss/311223.htmlhttp://www.aygfsteel.com/freeman1984/services/trackbacks/311223.html濡傛灉鎮(zhèn)ㄩ綣佸瓨鍙栧彉閲忥紝灝遍渶瑕佽€冭檻浠庝綍澶勫瓨鍙栬繖浜涘彉閲忋€傚彉閲忔槸

static

鍙橀噺錛岃繕鏄爢鏍堝彉閲忥紝鎴栬€呮槸綾葷殑瀹炰緥鍙橀噺錛熷彉閲忕殑瀛樺偍浣嶇疆瀵瑰瓨鍙栧畠鐨勪唬鐮佺殑鎬ц兘鏈夋槑鏄劇殑褰卞搷錛熶緥濡傦紝璇瘋€(gè)冭檻涓嬮潰榪欐浠ｇ爜錛?

class StackVars
            {
            private int instVar;
            private static int staticVar;
            //瀛樺彇鍫嗘爤鍙橀噺
            void stackAccess(int val)
            {
            int j=0;
            for (int i=0; i

榪欐浠ｇ爜涓殑姣忎釜鏂規(guī)硶閮芥墽琛岀浉鍚岀殑寰幆錛屽茍鍙嶅鐩稿悓鐨勬鏁般€傚敮涓€鐨勪笉鍚屾槸姣忎釜寰幆浣夸竴涓笉鍚岀被鍨嬬殑鍙橀噺閫掑銆傛柟娉?

stackAccess

浣夸竴涓眬閮ㄥ爢鏍堝彉閲忛€掑錛?instanceAccess 浣跨被鐨勪竴涓疄渚嬪彉閲忛€掑錛岃€?staticAccess 浣跨被鐨勪竴涓?static 鍙橀噺閫掑銆?

instanceAccess 鍜?staticAccess 鐨勬墽琛屾椂闂村熀鏈浉鍚屻€備絾鏄紝 stackAccess 瑕佸揩涓ゅ埌涓夊€嶃€傚瓨鍙栧爢鏍堝彉閲忓姝ゅ揩鏄洜涓猴紝JVM 瀛樺彇鍫嗘爤鍙橀噺姣斿畠瀛樺彇 static 鍙橀噺鎴栫被鐨勫疄渚嬪彉閲忔墽琛岀殑鎿嶄綔灝戙€傝鐪嬩竴涓嬩負(fù)榪欎笁涓柟娉曠敓鎴愮殑瀛楄妭鐮侊細(xì)

Method void stackAccess(int)
            0 iconst_0         //灝?0 鍘嬪叆鍫嗘爤銆?
            1 istore_2         //寮瑰嚭 0 騫跺皢瀹冨瓨鍌ㄥ湪灞€閮ㄥ垎鍙橀噺琛ㄤ腑绱㈠紩涓?2 鐨勪綅緗?(j)銆?
            2 iconst_0         //鍘嬪叆 0銆?
            3 istore_3         //寮瑰嚭 0 騫跺皢瀹冨瓨鍌ㄥ湪灞€閮ㄥ彉閲忚〃涓儲(chǔ)寮曚負(fù) 3 鐨勪綅緗?(i)銆?
            4 goto 13          //璺寵嚦浣嶇疆 13銆?
            7 iinc 2 1         //灝嗗瓨鍌ㄥ湪绱㈠紩 2 澶勭殑 j 鍔?1銆?
            10 iinc 3 1         //灝嗗瓨鍌ㄥ湪绱㈠紩 3 澶勭殑 i 鍔?1銆?
            13 iload_3          //鍘嬪叆绱㈠紩 3 澶勭殑鍊?(i)銆?
            14 iload_1          //鍘嬪叆绱㈠紩 1 澶勭殑鍊?(val)銆?
            15 if_icmplt 7      //寮瑰嚭 i 鍜?val銆傚鏋?i 灝忎簬 val錛屽垯璺寵嚦浣嶇疆 7銆?
            18 return           //榪斿洖璋冪敤鏂規(guī)硶銆?
            Method void instanceAccess(int)
            0 iconst_0         //灝?0 鍘嬪叆鍫嗘爤銆?
            1 istore_2         //寮瑰嚭 0 騫跺皢瀹冨瓨鍌ㄥ湪灞€閮ㄥ彉閲忚〃涓儲(chǔ)寮曚負(fù) 2 鐨勪綅緗?(i)銆?
            2 goto 18          //璺寵嚦浣嶇疆 18銆?
            5 aload_0          //鍘嬪叆绱㈠紩 0 (this)銆?
            6 dup              //澶嶅埗鍫嗘爤欏剁殑鍊煎茍灝嗗畠鍘嬪叆銆?
            7 getfield #19 
            //寮瑰嚭 this 瀵硅薄寮曠敤騫跺帇鍏?instVar 鐨勫€箋€?
            10 iconst_1         //鍘嬪叆 1銆?
            11 iadd             //寮瑰嚭鏍堥《鐨勪袱涓€鹼紝騫跺帇鍏ュ畠浠殑鍜屻€?
            12 putfield #19 
            //寮瑰嚭鏍堥《鐨勪袱涓€煎茍灝嗗拰瀛樺偍鍦?instVar 涓€?
            15 iinc 2 1         //灝嗗瓨鍌ㄥ湪绱㈠紩 2 澶勭殑 i 鍔?1銆?
            18 iload_2          //鍘嬪叆绱㈠紩 2 澶勭殑鍊?(i)銆?
            19 iload_1          //鍘嬪叆绱㈠紩 1 澶勭殑鍊?(val)銆?
            20 if_icmplt 5      //寮瑰嚭 i 鍜?val銆傚鏋?i 灝忎簬 val錛屽垯璺寵嚦浣嶇疆 5銆?
            23 return           //榪斿洖璋冪敤鏂規(guī)硶銆?
            Method void staticAccess(int)
            0 iconst_0         //灝?0 鍘嬪叆鍫嗘爤銆?
            1 istore_2         //寮瑰嚭 0 騫跺皢瀹冨瓨鍌ㄥ湪灞€閮ㄥ彉閲忚〃涓儲(chǔ)寮曚負(fù) 2 鐨勪綅緗?(i)銆?
            2 goto 16          //璺寵嚦浣嶇疆 16銆?
            5 getstatic #25 
            //灝嗗父鏁板瓨鍌ㄦ睜涓?staticVar 鐨勫€煎帇鍏ュ爢鏍堛€?
            8 iconst_1         //鍘嬪叆 1銆?
            9 iadd             //寮瑰嚭鏍堥《鐨勪袱涓€鹼紝騫跺帇鍏ュ畠浠殑鍜屻€?
            10 putstatic #25 
            //寮瑰嚭鍜岀殑鍊煎茍灝嗗畠瀛樺偍鍦?staticVar 涓€?
            13 iinc 2 1         //灝嗗瓨鍌ㄥ湪绱㈠紩 2 澶勭殑 i 鍔?1銆?
            16 iload_2          //鍘嬪叆绱㈠紩 2 澶勭殑鍊?(i)銆?
            17 iload_1          //鍘嬪叆绱㈠紩 1 澶勭殑鍊?(val)銆?
            18 if_icmplt 5      //寮瑰嚭 i 鍜?val銆傚鏋?i 灝忎簬 val錛屽垯璺寵嚦浣嶇疆 5銆?
            21 return           //榪斿洖璋冪敤鏂規(guī)硶銆?

鏌ョ湅瀛楄妭鐮佹彮紺轟簡(jiǎn)鍫嗘爤鍙橀噺鏁堢巼鏇撮珮鐨勫師鍥犮€侸VM 鏄竴縐嶅熀浜庡爢鏍堢殑铏氭嫙鏈猴紝鍥犳浼樺寲浜?jiǎn)瀵瑰爢鏍堟暟鎹殑瀛樺彇鍜屽鐞嗐€傛墍鏈夊眬閮ㄥ彉閲忛兘瀛樺偍鍦ㄤ竴涓眬閮ㄥ彉閲忚〃涓紝鍦?Java 鎿嶄綔鏁板爢鏍堜腑榪涜澶勭悊錛屽茍鍙楂樻晥鍦板瓨鍙栥€傚瓨鍙?static 鍙橀噺鍜屽疄渚嬪彉閲忔垚鏈洿楂橈紝鍥犱負(fù) JVM 蹇呴』浣跨敤浠ｄ環(huán)鏇撮珮鐨勬搷浣滅爜錛屽茍浠庡父鏁板瓨鍌ㄦ睜涓瓨鍙栧畠浠€傦紙甯告暟瀛樺偍姹犱繚瀛樹竴涓被鍨嬫墍浣跨敤鐨勬墍鏈夌被鍨嬨€佸瓧孌靛拰鏂規(guī)硶鐨勭鍙峰紩鐢ㄣ€傦級(jí)

閫氬父錛屽湪絎竴嬈′粠甯告暟瀛樺偍姹犱腑璁塊棶 static 鍙橀噺鎴栧疄渚嬪彉閲忎互鍚庯紝JVM 灝嗗姩鎬佹洿鏀瑰瓧鑺傜爜浠ヤ嬌鐢ㄦ晥鐜囨洿楂樼殑鎿嶄綔鐮併€傚敖綆℃湁榪欑浼樺寲錛屽爢鏍堝彉閲忕殑瀛樺彇浠嶇劧鏇村揩銆?

鑰冭檻鍒拌繖浜涗簨瀹烇紝灝卞彲浠ラ噸鏂版瀯寤哄墠闈㈢殑浠ｇ爜錛屼互渚塊€氳繃瀛樺彇鍫嗘爤鍙橀噺鑰屼笉鏄疄渚嬪彉閲忔垨 static 鍙橀噺浣挎搷浣滄洿楂樻晥銆傝鑰冭檻淇敼鍚庣殑浠ｇ爜錛?

class StackVars
            {
            //涓庡墠闈㈢浉鍚?..
            void instanceAccess(int val)
            {
            int j = instVar;
            for (int i=0; i

鏂規(guī)硶 instanceAccess 鍜?staticAccess 琚慨鏀逛負(fù)灝嗗畠浠殑瀹炰緥鍙橀噺鎴?static 鍙橀噺澶嶅埗鍒板眬閮ㄥ爢鏍堝彉閲忎腑銆傚綋鍙橀噺鐨勫鐞嗗畬鎴愪互鍚庯紝鍏跺€煎張琚鍒跺洖瀹炰緥鍙橀噺鎴?static 鍙橀噺涓€傝繖縐嶇畝鍗曠殑鏇存敼鏄庢樉鎻愰珮浜?instanceAccess 鍜?staticAccess 鐨勬€ц兘銆傝繖涓変釜鏂規(guī)硶鐨勬墽琛屾椂闂寸幇鍦ㄥ熀鏈浉鍚岋紝 instanceAccess 鍜?staticAccess 鐨勬墽琛岄€熷害鍙瘮 stackAccess 鐨勬墽琛岄€熷害鎱㈠ぇ綰?4%銆?

榪欏茍涓嶈〃紺烘?zhèn)ㄥ簲璇ラ伩鍏嶄娇鐢?static 鍙橀噺鎴栧疄渚嬪彉閲忋€傛?zhèn)ㄥ簲璇ヤ娇鐢ㄥ?guī)偍鐨勮璁℃湁鎰忎箟鐨勫瓨鍌ㄦ満鍒躲€備緥濡傦紝濡傛灉鎮(zhèn)ㄥ湪涓€涓驚鐜腑瀛樺彇 static 鍙橀噺鎴栧疄渚嬪彉閲忥紝鍒欐?zhèn)ㄥ彲浠ヤ复鏃稙畣瀹冧滑瀛樺偍鍦ㄤ竴涓眬閮ㄥ爢鏍堝彉閲忎腑錛岃繖鏍峰氨鍙互鏄庢樉鍦版彁楂樹唬鐮佺殑鎬ц兘銆傝繖灝嗘彁渚涙渶楂樻晥鐨勫瓧鑺傜爜鎸囦護(hù)搴忓垪渚?JVM 鎵ц
杞澆鑷猧bm

鐤媯 2010-01-29 14:56 鍙戣〃璇勮

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