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        STANDING ON THE SHOULDERS OF GIANTS</description><language>zh-cn</language><lastBuildDate>Tue, 07 Oct 2014 13:14:08 GMT</lastBuildDate><pubDate>Tue, 07 Oct 2014 13:14:08 GMT</pubDate><ttl>60</ttl><item><title> æˆ�功çš?Web 应用¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯• (转è�²)</title><link>http://www.aygfsteel.com/freeman1984/archive/2014/10/07/418488.html</link><dc:creator>疯狂</dc:creator><author>疯狂</author><pubDate>Tue, 07 Oct 2014 13:09:00 GMT</pubDate><guid>http://www.aygfsteel.com/freeman1984/archive/2014/10/07/418488.html</guid><wfw:comment>http://www.aygfsteel.com/freeman1984/comments/418488.html</wfw:comment><comments>http://www.aygfsteel.com/freeman1984/archive/2014/10/07/418488.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/freeman1984/comments/commentRss/418488.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/freeman1984/services/trackbacks/418488.html</trackback:ping><description><![CDATA[<blockquote style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px">
<p>转�自：<a >http://blog.chinaunix.net/uid-20682147-id-76384.html</a></p>
<p>性能‹¹‹è¯•æ˜?Web 应用¾pÈ�»Ÿçš„一™åšw‡�è¦�è´¨é‡�ä¿�è¯�措施。在现实中，很多 Web 性能‹¹‹è¯•™å¹ç›®ç”׃ºŽæ€§èƒ½‹¹‹è¯•éœ€æ±‚定义ä¸�å�ˆç�†æˆ–ä¸�明确åQŒå¯¼è‡´æ€§èƒ½‹¹‹è¯•™å¹ç›®ä¸�能辑ֈ°é¢„期目标或进度超期。本文针å¯?Web 应用¾pÈ�»Ÿçš„技术架构和¾pÈ�»Ÿä½¿ç”¨ç‰¹ç‚¹åQŒæŽ¢è®¨å¦‚何有效实施性能‹¹‹è¯•˜q‡ç¨‹åQŒåƈé‡�点介ç»�如何分æž�获得å�ˆç�†çš„性能‹¹‹è¯•éœ€æ±‚，最¾lˆå¯¹ Web 应用¾pÈ�»Ÿæ€§èƒ½˜q›è¡Œ¿U‘å­¦ã€�准¼‹®çš„评估ã€?/p></blockquote>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N10038"><span style="word-wrap: break-word" class="atitle">1 引言</span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">åŸÞZºŽWebæœ�务器的应用¾pÈ�»Ÿç”׃ºŽæ��ä¾›‹¹�览器界é�¢è€Œæ— ™åÕd®‰è£…，大大é™�低了系¾lŸéƒ¨¾|²å’Œå�‡çñ”æˆ�本åQŒå¾—以普é��应用。目å‰�，很多ä¼�业的核心业务系¾lŸå�‡æ˜¯Web应用åQŒä½†å½“Web应用的数æ�®é‡�和访问用户é‡�日益增加åQŒç³»¾lŸä¸�å¾—ä¸�é�¢ä�Í性能和å�¯é� æ€§æ–¹é�¢çš„挑战。因此，无论是Web应用¾pÈ�»Ÿçš„å¼€å�‘商或最¾lˆç”¨æˆøP¼Œéƒ½è¦�求在上线å‰�对¾pÈ�»Ÿ˜q›è¡Œæ€§èƒ½åQŒç§‘学评ä»ïL³»¾lŸçš„性能åQŒä»Žè€Œé™�低系¾lŸä¸Š¾U¿å�Žçš„性能风险ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">在很多性能‹¹‹è¯•™å¹ç›®ä¸­ï¼Œç”׃ºŽä¸�能å�ˆç�†å®šä¹‰¾pÈ�»Ÿçš„性能‹¹‹è¯•éœ€æ±‚，ä¸�能建立和真实环境相½W¦çš„è´Ÿè�²æ¨¡åž‹åQŒä¸�能科学分æž�性能‹¹‹è¯•¾l“æžœåQŒå¯¼è‡´æ€§èƒ½‹¹‹è¯•™å¹ç›®æŒ�箋旉™—´å¾ˆé•¿æˆ–ä¸�能真正评ä»ïL³»¾lŸæ€§èƒ½òq¶æ��出性能改进措施ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">本文在æ€È�»“许多Web应用¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•å®žè·µ¾l�验和教训的基础上，从与性能‹¹‹è¯•å·¥å…·æ— å…³çš„角度介¾l�Web应用¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•çš„方法和实施˜q‡ç¨‹åQŒä»¥å�Šå¦‚何定义å�ˆç�†çš„性能‹¹‹è¯•éœ€æ±‚ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N10049"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">1.1 术语定义</font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">性能‹¹‹è¯•åQšé€šè¿‡æ¨¡æ‹Ÿå¤§é‡�‹¹�览器客æˆïL«¯å�Œæ—¶è®‰K—®Webæœ�务器，获得¾pÈ�»Ÿçš„性能数æ�®ã€?/p>
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<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">æ€�考时é—ß_¼š‹¹�览器在收到å“�应å�Žåˆ°æ��交下一个请求之间的间隔旉™—´ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">è¯äh±‚æˆ�功率：Webæœ�务器正¼‹®å¤„ç�†çš„è¯äh±‚æ•°é‡�和接收到的请求数é‡�的比ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">å�žå��é‡�：å�•ä½�æ—‰™—´å†…Webæœ�务器æˆ�功处ç�†çš„HTTP™åµé�¢æˆ–HTTPè¯äh±‚æ•°é‡�ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">在线用户åQšç”¨æˆ·é€šè¿‡‹¹�览器访问登录Web应用¾pÈ�»Ÿå�Žï¼Œòq¶ä¸�退å‡ø™¯¥åº”用¾pÈ�»Ÿã€‚通常一个Web应用æœ�务器的在线用户对应Web应用æœ�务器的一个Sessionã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">òq¶å�‘用户敎ͼšWebæœ�务器在一ŒD‰|—¶é—´å†…为处ç�†æµ�览器è¯äh±‚而å¾�ç«‹çš„HTTP˜qžæŽ¥æ•°æˆ–生æˆ�的处ç�†çº¿½E‹æ•°ã€‚当所有在¾U¿ç”¨æˆ·å�‘é€�HTTPè¯äh±‚çš„æ€�考时间äؓ零时åQŒWebæœ�务器的òq¶å�‘用户数等于在¾U¿ç”¨æˆäh•°ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N10067"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">1.2 Web应用¾pÈ�»ŸæŠ€æœ¯æž¶æž?/font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">Web应用¾pÈ�»Ÿçš„å‰�端äØ“‹¹�览器，å�Žå�°ä¸ºWebæœ�务器（如ApacheåQŒMicrosoft Internet Information ServeråQ‰ï¼Œ‹¹�览器和Webæœ�务器之间的交互åŸÞZºŽHTTPå��议。HTTPå��议本èín是无˜qžæŽ¥çš„，Webæœ�务器通过Session机制æ�¥å¾�立一个æµ�览器所å�‘出的先å�Žè¿žæŽ¥ä¹‹é—´çš„å…Œ™�”。通过实验è¯�明åQŒå½“‹¹�览器客æˆïL«¯åœ¨é¦–‹Æ¡è®¿é—®Webæœ�务器å�ŽåQŒå¦‚果该‹¹�览器客æˆïL«¯ä¸�å�‘é€�å�Ž¾l­è¯·æ±‚，æœ�务器维æŒ�该‹¹�览器客æˆïL«¯çš„Sessionå�˜é‡�所消耗的¾pÈ�»Ÿèµ„æº�é�žå¸¸ž®�ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N10070"><span style="word-wrap: break-word" class="atitle">2 Web应用¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•˜q‡ç¨‹</span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">标准的Web应用¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•˜q‡ç¨‹åŒ…括¼‹®å®šæ€§èƒ½‹¹‹è¯•éœ€æ±‚，开å�‘性能‹¹‹è¯•è„šæœ¬åQŒå®šä¹‰æ€§èƒ½‹¹‹è¯•è´Ÿè�²æ¨¡åž‹åQŒæ‰§è¡Œæ€§èƒ½‹¹‹è¯•å’ŒåÅžæˆ�性能‹¹‹è¯•æŠ¥å‘Šã€‚本章将分别介ç»�上述˜q‡ç¨‹åQŒåƈ通过举例说明如何完æˆ�æ¯�一环节ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N1007A"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">2.1 ¼‹®å®šæ€§èƒ½‹¹‹è¯•éœ€æ±?/font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">¿U‘学定义Web应用¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•éœ€æ±‚对一个æˆ�功的性能‹¹‹è¯•é�žå¸¸é‡�è¦�。通常åQŒWeb应用¾pÈ�»Ÿçš„性能‹¹‹è¯•éœ€æ±‚有如下两ç§�æ��è¿°æ–ÒŽ³•ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><strong style="word-wrap: break-word">2.1.1 åŸÞZºŽåœ¨çº¿ç”¨æˆ·çš„性能‹¹‹è¯•éœ€æ±?/strong></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">该需求æ��˜q°æ–¹æ³•ä¸»è¦�基于Web应用¾pÈ�»Ÿçš„在¾U¿ç”¨æˆ·å’Œå“�应旉™—´æ�¥åº¦é‡�ç³»¾lŸæ€§èƒ½ã€‚当Web应用¾pÈ�»Ÿåœ¨ä¸Š¾U¿å�Žæ‰€æ”¯æŒ�的在¾U¿ç”¨æˆäh•°ä»¥å�Šæ“�作习惯åQˆåŒ…括æ“�作和è¯äh±‚之间的åšg˜qŸï¼‰å¾ˆå®¹æ˜“获得，如ä¼�业的内部应用¾pÈ�»ŸåQ?通常采用åŸÞZºŽåœ¨çº¿ç”¨æˆ·çš„æ–¹å¼�æ�¥æ��述性能‹¹‹è¯•éœ€æ±‚。以æ��ä¾›¾|‘上购物的Web应用¾pÈ�»Ÿä¸ÞZ¾‹åQŒåŸºäºŽåœ¨¾U¿ç”¨æˆïLš„性能‹¹‹è¯•éœ€æ±‚å�¯æ��述为：<strong style="word-wrap: break-word">10个在¾U¿ç”¨æˆähŒ‰æ­£å¸¸æ“�作速度讉K—®¾|‘上购物¾pÈ�»Ÿçš„下定å�•åŠŸèƒ½åQŒä¸‹å®šå�•äº¤æ˜“çš„æˆ�功率æ˜?00%åQŒè€Œä¸”90%的下定å�•è¯äh±‚å“�应旉™—´ä¸�大äº?¿U’ï¼›å½?0%的请求å“�应时间ä¸�大于用户的最大容å¿�æ—¶é—?0¿U’æ—¶åQŒç³»¾lŸèƒ½æ”¯æŒ�50个在¾U¿ç”¨æˆ?/strong>ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><strong style="word-wrap: break-word">2.1.2 åŸÞZºŽå�žå��é‡�的性能‹¹‹è¯•éœ€æ±?/strong></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">该需求æ��˜q°æ–¹æ³•ä¸»è¦�基于Web应用¾pÈ�»Ÿçš„å�žå��é‡�å’Œå“�应时间æ�¥åº¦é‡�¾pÈ�»Ÿæ€§èƒ½ã€‚当Web应用在上¾U¿å�Žæ‰€æ”¯æŒ�的在¾U¿ç”¨æˆäh— æ³•ç¡®å®šï¼Œå¦‚基于Internet的网上购物系¾lŸï¼Œå�¯é€šè¿‡æ¯�天下定å�•çš„业务é‡�直接计½Ž—å…¶å�žå��é‡�，从而采å�–基于å�žå��é‡�çš„æ–¹å¼�æ�¥æ��述性能‹¹‹è¯•éœ€æ±‚。以¾|‘上购物¾pÈ�»Ÿä¸ÞZ¾‹åQŒåŸºäºŽå�žå��é‡�的性能‹¹‹è¯•éœ€æ±‚å�¯æ��述为：<strong style="word-wrap: break-word">¾|‘上购物¾pÈ�»Ÿåœ¨æ¯�分钟内需处ç�†10½W”下定å�•æ“�作åQŒäº¤æ˜“æˆ�功率ä¸?00%åQŒè€Œä¸”90%的请求å“�应时间ä¸�大于8¿U?/strong>ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N1009B"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">2.2 å¼€å�‘性能‹¹‹è¯•è„šæœ¬</font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">在确定Web应用¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•éœ€æ±‚å�ŽåQŒå°±è¦�æ ¹æ�®æ€§èƒ½‹¹‹è¯•éœ€æ±‚中¼‹®å®šçš„功能开å�‘性能‹¹‹è¯•è„šæœ¬ã€‚比如，针对å‰�é�¢å®šä¹‰çš„网上购物系¾lŸçš„性能‹¹‹è¯•éœ€æ±‚，ž®†å¼€å�‘下定å�•åŠŸèƒ½çš„性能‹¹‹è¯•è„šæœ¬ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">性能‹¹‹è¯•è„šæœ¬æ˜¯æ��˜q°å�•ä¸ªæµ�览器å�‘Webæœ�务器å�‘é€�çš„HTTPè¯äh±‚åº�列。æ¯�个性能‹¹‹è¯•å·¥å…·åQˆå¦‚IBM Rational Performance TesteråQ?LoadRunneråQ‰æ‰€æ��供的测试脚本语法是ä¸�å�Œçš„。测试ä�h员利用性能‹¹‹è¯•å·¥å…·å�¯ä»Žå¤´æ‰‹å·¥ç¼–写测试脚本，也å�¯ä»¥é€šè¿‡å½•åˆ¶‹¹�览器和Webæœ�务器之间的¾|‘络通信数æ�®è€Œè‡ªåŠ¨åÅžæˆ�测试脚本ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">ä»ÖM½•æ€§èƒ½‹¹‹è¯•å·¥å…·éƒ½ä¸�能ä¿�è¯�录制åÅžæˆ�的性能‹¹‹è¯•è„šæœ¬çš„æ­£¼‹®æ€§ï¼Œ‹¹‹è¯•äººå‘˜åº”通过在å�•ç”¨æˆ·ä¸‹è¿�行性能‹¹‹è¯•è„šæœ¬å¯¹å…¶æ­£ç¡®æ€§è¿›è¡ŒéªŒè¯�。测试脚本ä¸�正确的一个é‡�è¦�原因就是脚本的数æ�®å…Œ™�”ä¸�æ­£¼‹®ï¼Œä¹Ÿå°±æ˜¯åƈ没完全å¾�立一个测试请求和å‰�é�¢çš„å“�应内容之间的兌™�”。测试脚本HTTPè¯äh±‚å’Œå“�应之间的数æ�®å…Œ™�”是å�¦æ­£ç¡®çš„一个é‡�è¦�标准是å�•ç”¨æˆ¯‚¿�行脚本，脚本能完æˆ�期望的功能ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">在完æˆ�性能‹¹‹è¯•è„šæœ¬çš„æ•°æ�®å…³è�”å�ŽåQŒéœ€è¦�对脚本˜q›è¡Œå�‚数化，也就是把脚本中的æŸ�些è¯äh±‚æ•°æ�®æ›¿æ�¢æˆ�å�˜é‡�，å�˜é‡�的值æ�¥äºŽä¸€ä¸ªç‹¬ç«‹çš„æ•°æ�®æ–‡äšgåQŒä»Žè€Œä¿�è¯�在多虚拟用戯‚¿�行脚本的情况下，æ¯�个虚拟用户所æ��交的数æ�®æ˜¯ä¸�å�Œçš„ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">此外åQŒäؓ了测试Web应用的å�¯é� æ€§ï¼Œ˜q˜éœ€è¦�对è¯äh±‚所收到的å“�应进行验è¯�（比如验è¯�å“�应的HTTP˜q”回ç �或验è¯�å“�应的内容）åQŒä¾¿äºŽæ€§èƒ½‹¹‹è¯•å®Œæˆ�å�Žç»Ÿè®¡è¯·æ±‚æˆ�功率ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N100B0"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">2.3 建立性能‹¹‹è¯•è´Ÿè�²æ¨¡åž‹</font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">性能‹¹‹è¯•è´Ÿè�²æ¨¡åž‹å®šä¹‰äº†æµ‹è¯•å·¥å…·å¦‚何å�‘Web应用¾pÈ�»Ÿæ��交è¯äh±‚åQŒåŒ…括å�‘Web应用¾pÈ�»Ÿå�‘é€�请求的虚拟用户敎ͼŒæ¯�个虚拟用户å�‘é€�请求的速度和频率。针对å‰�é�¢ä»‹¾l�çš„¾|‘上购物¾pÈ�»Ÿçš„性能‹¹‹è¯•éœ€æ±‚，在性能‹¹‹è¯•å·¥å…·ä¸­å®šä¹‰çš„性能‹¹‹è¯•è´Ÿè�²æ¨¡åž‹åº”包括如下信æ�¯ï¼š</p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">虚拟用户敎ͼšæ€§èƒ½‹¹‹è¯•ä¸�仅仅是执行一‹Æ¡ï¼Œè€Œä¸”æ¯�次执行时虚拟用æˆäh•°ä¹Ÿä¸�固定åQŒå› æ­¤åœ¨æ€§èƒ½‹¹‹è¯•è´Ÿè�²æ¨¡åž‹ä¸­å®šä¹‰çš„虚拟用户数将在测试执行时˜q›è¡Œè®„¡½®ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">虚拟用户å�‘é€�请求的æ€�考时间和˜q­ä»£‹Æ¡æ•°åQšè™šæ‹Ÿç”¨æˆ·å�‘é€�请求的æ€�考时间长短是军_®šWeb应用¾pÈ�»Ÿè´Ÿè�²é‡�çš„é‡�è¦�因素之一åQŒè€Œè„P代次数将军_®šæ€§èƒ½‹¹‹è¯•çš„执行æŒ�¾l­æ—¶é—´ã€‚对åŸÞZºŽåœ¨çº¿ç”¨æˆ·çš„性能‹¹‹è¯•éœ€æ±‚，ž®†åŸºäºŽå½•åˆ¶è„šæœ¬æ—¶è®°å½•çš„æ€�考时é—ß_¼Œè€Œä¸”ç”׃ºŽçŽ°å®žä¸­ä¸�å�Œç”¨æˆ¯‚®¿é—®ç³»¾lŸçš„æ€�考时间ä¸�å�Œï¼Œå�¯æŠŠæ€�考时间设¾|®äؓ在一定范围内的éš�机倹{€‚对于基于å�žå��é‡�的性能‹¹‹è¯•éœ€æ±‚，ž®†æŠŠæ€�考时间设¾|®äØ“é›Óž¼Œæ­¤æ—¶Web应用¾pÈ�»Ÿçš„在¾U¿ç”¨æˆäh•°é‡�å°†½{‰äºŽòq¶å�‘用户数。å�Œæ—Óž¼Œä¸ÞZº†é�¿å…�性能‹¹‹è¯•åŽ‹åŠ›çš„éš�机性，ž®†å¢žåŠ è¯·æ±‚çš„˜q­ä»£‹Æ¡æ•°æ�¥å¢žåŠ æµ‹è¯•æ‰§è¡ŒæŒ�¾l­æ—¶é—ß_¼Œä»Žè€ŒèŽ·å¾—ç³»¾lŸåœ¨½E›_®šåŽ‹åŠ›ä¸‹çš„性能数æ�®ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">虚拟用户å�¯åŠ¨æ¨¡å¼�åQšåœ¨çŽ°å®žä¸­ï¼ŒWeb应用¾pÈ�»Ÿçš„用户ä¸�太å�¯èƒ½å�Œæ—¶å�šç›¸å�Œçš„æ“�作，因此ä¸ÞZº†è®©Web应用¾pÈ�»Ÿæ‰€æ‰¿æ‹…的压力éš�æ—‰™—´å�‡åŒ€åˆ†å¸ƒåQŒå¾�议虚拟用户ä¾�‹Æ¡å�¯åŠ¨ï¼Œå�Œæ—¶ä¹Ÿé�¿å…�大é‡�用户å�Œæ—¶ç™»å½•é€ æˆ�¾pÈ�»Ÿé˜Õd¡žã€‚以10个虚拟用æˆäh¨¡æ‹Ÿä¸‹å®šå�•ä¸ÞZ¾‹åQŒå�¯è®„¡½®æ¯�个虚拟用户间隔30¿U’å�¯åŠ¨ï¼Œ˜q™æ ·10个虚拟用户å�¯åœ?分钟å�Žå®Œæˆ�å�¯åŠ¨ï¼Œòq¶ä¿�è¯?0个虚拟用户ä¸�会在å�Œä¸€æ—¶åˆ»ä¸‹å®šå�•ï¼Œä»Žè€Œæ›´½W¦å�ˆå®žé™…情况ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N100C2"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">2.4 执行性能‹¹‹è¯•</font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">执行性能‹¹‹è¯•æ˜¯æŒ‡é€šè¿‡å¤šæ¬¡˜q�行性能‹¹‹è¯•è´Ÿè�²æ¨¡åž‹åQŒèŽ·å¾—ç³»¾lŸçš„性能数æ�®ã€‚在执行˜q‡ç¨‹ä¸­ï¼Œéœ€åˆ©ç”¨‹¹‹è¯•å·¥å…·ã€�æ“�作系¾lŸã€�ç³»¾lŸèÊYä»Óž¼ˆå¦‚Web Server或DB ServeråQ‰æ��供的资æº�监控手段对资æº�进行监控和分æž�åQŒå¸®åŠ©å�‘现资æº�瓶颈，òq¶åœ¨¾pÈ�»Ÿå±‚é�¢˜q›è¡Œä¼˜åŒ–。å�Œæ—Óž¼Œ˜q˜éœ€å¯¹åº”用进行性能分æž�åQŒå¸®åŠ©å®šä½�应用代ç �中的性能问题åQŒåˆ‡å®žè§£å†³ç³»¾lŸçš„性能问题ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N100CB"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">2.5 å½¢æˆ�性能‹¹‹è¯•æŠ¥å‘Š</font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">性能‹¹‹è¯•™å¹ç›®çš„最å�Žé˜¶ŒDµå°±æ˜¯å�‘相关人员æ��交性能‹¹‹è¯•æŠ¥å‘ŠåQŒæ±‡æŠ¥æ€§èƒ½‹¹‹è¯•¾l“果。在å�‘相关ä�h员汇报性能‹¹‹è¯•¾l“æžœæ—Óž¼Œòq¶ä¸�是性能‹¹‹è¯•æŠ¥å‘Š­‘Šä¸°å¯Œã€�性能数æ�®­‘Šå¤š­‘Šå¥½ã€‚好的性能‹¹‹è¯•æŠ¥å‘Šæ˜¯èƒ½å‡†ç¡®ã€�简å�•åœ°ä¼ é€’性能‹¹‹è¯•¾l“论åQŒè€Œä¸�需太多的技术细节ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">针对åŸÞZºŽåœ¨çº¿ç”¨æˆ·æ•°çš„性能‹¹‹è¯•éœ€æ±‚，å�¯é€šè¿‡ä¸‹å›¾æ€È�»“性能‹¹‹è¯•¾l“论。其中横轴是在线用户敎ͼŒ¾Uµèáu是å“�应时é—ß_¼Œå¦?0在线用户讉K—®¾|‘上购物¾pÈ�»Ÿæ—Óž¼Œ90%的下定å�•è¯äh±‚å“�应旉™—´ä¸�超˜q?0¿U’ã€?/p><br style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" /><a style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(86,86,86); word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px" name="N100D9"><strong style="word-wrap: break-word">图一åQšåœ¨¾U¿ç”¨æˆäh•°å’Œå“�应时间时间的­‘‹åŠ¿å›?/strong></a><br style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" /><span style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; display: inline !important; font: 16px/26px 宋体, Arial; white-space: normal; float: none; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px">&nbsp;</span> 
<div style="text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" align="center"><img style="border-bottom: 0px; border-left: 0px; word-wrap: break-word; border-top: 0px; border-right: 0px" onload="javascript:if(this.width>500)this.width=500;" border=0 src="http://blogimg.chinaunix.net/blog/upfile2/080811100601.gif"></div><br style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" />
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">针对åŸÞZºŽå�žå��é‡�的性能‹¹‹è¯•éœ€æ±‚，å�¯é€šè¿‡ä¸‹å›¾çš„曲¾U¿æ�¥æ��述性能‹¹‹è¯•¾l“果。以¾|‘上购物¾pÈ�»Ÿä¸ÞZ¾‹åQŒä¸‹å›¾æ��˜qîC¸‹å®šå�•çš„åƈå�‘用戗÷€�下定å�•å“�应旉™—´ä»¥å�Šå�žå��é‡�（æœ�务器æ¯�¿U’处ç�†å®šå�•ç¬”敎ͼ‰ä¹‹é—´çš„å…³¾p»ï¼Œä»Žè€Œå¿«é€Ÿåˆ¤æ–­ç³»¾lŸæ˜¯å�¦èƒ½æ»¡èƒö性能‹¹‹è¯•éœ€æ±‚。从下图中å�¯çœ‹å‡ºåQŒåƈå�‘用户增加，è¯äh±‚çš„å“�应时间也增加。æœ�务器的å�žå��é‡�是先éš�åƈå�‘用æˆäh•°å¢žåŠ è€Œå¢žåŠ ï¼Œå½“å�žå��é‡�到达一定峰值å�ŽåQŒå†�增加òq¶å�‘用户敎ͼŒå�žå��é‡�会å‡�少。原因在于当òq¶å�‘用户数少æ—Óž¼Œå�‘Webæœ�务器æ��交的è¯äh±‚é‡�ä¸�大，æœ�务器处ç�†èƒ½åŠ›è¿˜æœ‰å¯Œä½™ï¼Œæ‰€ä»¥å�žå��é‡�é€�步增大åQ›ä½†å½“åƈå�‘用æˆäh•°­‘…过æŸ�一值时åQŒç”±äºŽå�‘æœ�务器æ��交的è¯äh±‚太多åQŒé€ æˆ�æœ�务器阻塞，å��而导致å�žå��é‡�å‡�å°‘ã€?/p><br style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" /><a style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(86,86,86); word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px" name="N100EA"><strong style="word-wrap: break-word">图二åQšå“�应时间ã€�å�žå��é‡�å’Œåƈå�‘用æˆäh•°çš„趋势图</strong></a><br style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" /><span style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; display: inline !important; font: 16px/26px 宋体, Arial; white-space: normal; float: none; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px">&nbsp;</span> 
<div style="text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" align="center"><img style="border-bottom: 0px; border-left: 0px; word-wrap: break-word; border-top: 0px; border-right: 0px" onload="javascript:if(this.width>500)this.width=500;" border=0 src="http://blogimg.chinaunix.net/blog/upfile2/080811100609.gif" width=500></div><br style="text-align: left; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; letter-spacing: normal; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; -webkit-text-stroke-width: 0px" />
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N100F6"><span style="word-wrap: break-word" class="atitle">3 如何获å�–å�ˆç�†çš„性能‹¹‹è¯•éœ€æ±?/span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">å‰�一章介¾l�了Web应用¾pÈ�»Ÿçš„性能‹¹‹è¯•˜q‡ç¨‹åQŒç¡®å®šæ€§èƒ½‹¹‹è¯•éœ€æ±‚是整个性能‹¹‹è¯•çš„è“v点和æˆ�功的é‡�è¦�因素。性能‹¹‹è¯•éœ€æ±‚定义得˜q‡é«˜åQŒè™½ç„¶ç¡®ä¿�ç³»¾lŸä¸Š¾U¿å�Žèƒ½æ»¡­‘Ïx€§èƒ½éœ€æ±‚，但å�¯èƒ½ä¼šé€ æˆ�¼‹¬äšg资æº�的浪费；性能‹¹‹è¯•éœ€æ±‚定义得˜q‡ä½ŽåQŒç³»¾lŸä¸Š¾U¿å�Žå�¯èƒ½ä¼šå‡ºçŽ°æ€§èƒ½é—®é¢˜ã€‚如何通过分æž�¾pÈ�»Ÿä¸Šçº¿å�Žå�¯èƒ½çš„用户讉K—®è¡ŒäØ“åQŒæ�¥èŽ·å¾—å�ˆç�†çš„性能‹¹‹è¯•éœ€æ±‚指标呢åQ?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">å�‡è®¾çŽ°æœ‰ä¸€ä¸ªåŸºäºŽWeb的办公自动化¾pÈ�»ŸåQˆç®€¿U°OA¾pÈ�»ŸåQ‰ï¼Œè¯¥ç³»¾lŸæ��供公文收å�‘和查询功能。在部çÖv该系¾lŸå‰�åQŒå°†å¯¹è¯¥¾pÈ�»Ÿ˜q›è¡Œæ€§èƒ½‹¹‹è¯•ã€‚下é�¢å°†è¯¦ç»†ä»‹ç»�如何分æž�该OA¾pÈ�»Ÿçš„ä‹É用情况，定义å�ˆç�†çš„性能‹¹‹è¯•éœ€æ±‚ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N10102"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">3.1 如何获得OA¾pÈ�»Ÿçš„在¾U¿ç”¨æˆäh•°é‡?/font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">在线用户数é‡�是指在特定时间区间内åQŒæœ‰å¤šå°‘用户讉K—®Web应用¾pÈ�»ŸåQˆå¯¹åº”到Webæœ�务器的Session敎ͼ‰åQŒæ ¹æ�®ç³»¾lŸå�¯èƒ½è®¿é—®ç”¨æˆäh•°ä»¥å�Šæ¯�个用户讉K—®¾pÈ�»Ÿçš„时间长短æ�¥¼‹®å®šã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">对于ž®†è¦�部çÖvçš„OA¾pÈ�»ŸåQŒé€šè¿‡åˆ†æž�获得该系¾lŸæœ‰8000个注册用æˆøP¼ŒåŸºæœ¬ä¸Šæ‰€æœ‰çš„用户æ¯�天åQ?ž®�时工作旉™—´åQ‰éƒ½ä¼šè®¿é—®OA¾pÈ�»ŸåQŒåã^å�‡åœ¨¾U¿æ—¶é—ß_¼ˆä»Žç™»å½•OA¾pÈ�»Ÿåˆ°é€€å‡ºOA¾pÈ�»Ÿä¹‹é—´çš„时间间隔，也å�¯ä»¥æ˜¯å¤šæ¬¡åœ¨çº¿æ—‰™—´çš„å�ˆè®¡ï¼‰ä¸?2分钟åQŒé‚£ä¹ˆè¯¥OA¾pÈ�»Ÿçš„åã^å�‡åœ¨¾U¿æ•°åQˆä¹Ÿž®±æ˜¯Web应用Sessionå�˜é‡�敎ͼ‰ä¸?00个（8000 * 0.2 / 8åQ‰ï¼Œå�‡è®¾å³°å€¼åœ¨¾U¿ç”¨æˆäh•°æ˜¯åã^å�‡åœ¨¾U¿ç”¨æˆäh•°çš?å€�（该å€�æ•°å�¯æ ¹æ�®å®žé™…情况调æ•ß_¼‰åQŒåˆ™æ€§èƒ½‹¹‹è¯•éœ€æ±‚的在线用户æ•îCØ“600ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N1010E"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">3.2 如何¼‹®å®šOA¾pÈ�»Ÿçš„性能‹¹‹è¯•ç”¨ä¾‹</font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">ç”׃ºŽæ—‰™—´å’Œèµ„æº�é™�åˆÓž¼Œä¸�å�¯èƒ½å¯¹Web应用¾pÈ�»Ÿçš„所有功能进行性能‹¹‹è¯•åQŒè€Œæ˜¯ä»Žä¸šåŠ¡çš„角度åQˆå¦‚æŸ�一功能æ“�作的用户多åQ‰å’ŒæŠ€æœ¯çš„角度åQˆå¦‚æŸ�一功能虽然讉K—®ç”¨æˆ·ä¸�多åQŒä½†å†…部处ç�†é€»è¾‘å¤�æ�‚或处ç�†æ•°æ�®é‡�大）æ�¥é€‰æ‹©Web应用¾pÈ�»Ÿçš„特定功能作为性能‹¹‹è¯•ç”¨ä¾‹ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">以OA¾pÈ�»Ÿä¸ÞZ¾‹åQŒç”±äºŽæ‰€æœ‰ç”¨æˆ·éƒ½¾l�常公文查询功能åQŒå› æ­¤ç¡®å®šçš„性能‹¹‹è¯•ç”¨ä¾‹ä¸ºå…¬æ–‡æŸ¥è¯¢ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N1011A"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">3.3 如何¼‹®å®šOA¾pÈ�»Ÿçš„å“�应时é—?/font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">å“�应旉™—´çš„快慢直接媄å“�了¾pÈ�»Ÿä½¿ç”¨ç”¨æˆ·çš„满æ„�度åQŒé‡‡ç”¨åã^å�‡å“�应时间æ�¥æ��è¿°¾pÈ�»Ÿ¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•éœ€æ±‚是ä¸�科学的åQŒå› ä¸ºæ— æ³•ç›´æŽ¥å’Œå®¢æˆ·çš„满æ„�度挂钩。而且åQŒåœ¨å�šæ€§èƒ½‹¹‹è¯•åQŒå¦‚æžœæŸ�一è¯äh±‚çš„å“�应时间过长或˜q‡çŸ­åQŒå°†å¯ÆD‡´òq›_�‡å“�应旉™—´å’Œå®žé™…情况å��¼›…R€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">以OA¾pÈ�»Ÿä¸ÞZ¾‹åQŒå®šä¹‰çš„å“�应旉™—´éœ€æ±‚äØ“åQ?0%åQˆè¯¥ç™‘Öˆ†æ¯”å’Œè¦�求的系¾lŸç”¨æˆäh»¡æ„�度相关åQ‰çš„查询è¯äh±‚å“�应旉™—´ä¸�超˜q?¿U’（该时间å�¯æ ÒŽ�®å®žé™…情况¼‹®å®šåQ‰ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N10126"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">3.4 如何¼‹®å®šOA¾pÈ�»Ÿçš„交易å�žå��é‡�</font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">å�•ä½�æ—‰™—´å†…Web应用¾pÈ�»Ÿéœ€å¤„ç�†å¤šå°‘½W”特定的交易å�¯é€šè¿‡¾lŸè®¡èŽ·å¾—。以OA¾pÈ�»Ÿä¸ÞZ¾‹åQŒå�‡è®¾æ¯�个用æˆäh¯�天（一天按8ž®�时计算åQ‰åã^å�‡ä¼šæŸ¥è¯¢å…¬æ–‡4‹Æ¡ï¼Œé‚£OA应用的Webæœ�务器åã^å�‡æ¯�分钟è¦�能处ç�†8000 * 4 / ( 60 * 8 ) = 66.67½W”查询公文交易，考虑到峰值因素，è¦�求æ¯�分钟能处ç�†66.7 * 3=200½W”查询公文交易ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N1012F"><span style="word-wrap: break-word" class="smalltitle"><strong style="word-wrap: break-word"><font style="word-wrap: break-word" size="3" face="Arial">3.5 OA¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•éœ€æ±‚æ��˜q?/font></strong></span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">通过å‰�é�¢çš„分æž�，能明¼‹®å®šä¹‰å�ˆç�†çš„性能‹¹‹è¯•éœ€æ±‚。OA¾pÈ�»Ÿæ€§èƒ½‹¹‹è¯•éœ€æ±‚定义如下：</p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">åŸÞZºŽåœ¨çº¿ç”¨æˆ·æ•°çš„性能‹¹‹è¯•éœ€æ±‚：600个在¾U¿ç”¨æˆähŒ‰æ­£å¸¸æ“�作速度讉K—®OA¾pÈ�»Ÿçš„查询公文功能，所有查询请求的æˆ�功率是100%åQŒè€Œä¸”90%的查询请求å“�应时间ä¸�大于8¿U’ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">åŸÞZºŽå�žå��é‡�的性能‹¹‹è¯•éœ€æ±‚：OA¾pÈ�»Ÿåœ¨æ¯�分钟内需处ç�†200½W”查询公文æ“�作，交易æˆ�功率äØ“100%åQŒè€Œä¸”90%的请求å“�应时间ä¸�大于8¿U’ã€?/p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px"><a style="word-wrap: break-word; color: rgb(25,89,155); text-decoration: none" name="N1013E"><span style="word-wrap: break-word" class="atitle">4 æ€È�»“</span></a></p>
<p style="text-align: left; padding-bottom: 0px; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; margin: 5px 0px; padding-left: 0px; letter-spacing: normal; padding-right: 0px; font: 16px/26px 宋体, Arial; word-wrap: break-word; white-space: normal; color: rgb(102,102,102); word-spacing: 0px; padding-top: 0px; -webkit-text-stroke-width: 0px">Web应用性能‹¹‹è¯•™å¹ç›®æˆ�功的关键ä¸�在于性能‹¹‹è¯•å·¥å…·åQŒè€Œåœ¨äºŽæœ‰æ•ˆçš„性能‹¹‹è¯•åˆ†æž�æ–ÒŽ³•å’Œå®žè·üc€‚å�ªæœ‰åˆ‡å®žæŽŒæ�¡æ€§èƒ½‹¹‹è¯•éœ€æ±‚分æž�方法，性能‹¹‹è¯•å®žè·µ¾l�验åQŒæ‰�能ä¿�è¯�一个Web应用性能‹¹‹è¯•çš„æˆ�功ã€?/p> <img src ="http://www.aygfsteel.com/freeman1984/aggbug/418488.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/freeman1984/" target="_blank">疯狂</a> 2014-10-07 21:09 <a href="http://www.aygfsteel.com/freeman1984/archive/2014/10/07/418488.html#Feedback" target="_blank" style="text-decoration:none;">å�‘表评论</a></div>]]></description></item></channel></rss>                                                                         <footer>
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