本節(jié)書摘來自異步社區(qū)《LoadRunner 12七天速成寶典》一書中的第2章，第2.6節(jié)第二個(gè)性能測試案例，作者陳霽，更多章節(jié)內(nèi)容可以訪問云棲社區(qū)“異步社區(qū)”公眾號查看。

2.6　第二個(gè)性能測試案例
云云：烤魚吃得很爽。

戀戀：就是你非要吃香辣味的，害得我嘴巴都麻了。

云云：香辣味的好吃，就是鯰魚吃得有點(diǎn)膩，能吃黑魚就好了。

戀戀：下次多找?guī)讉€(gè)人一起吃飯啊，這下他們生意就更好了。

云云：那么我問你一下點(diǎn)一樣的魚和點(diǎn)不同的魚有什么區(qū)別？

戀戀：嘿，你又要考我啦，其實(shí)剛才你還沒提問，我腦子里面就在想這個(gè)問題了。

云云：哦，美美狗開竅了？

戀戀：不但我是美美狗還是聰聰狗，你那點(diǎn)小花樣我早看出來了。

云云：那么你說說，讓我欣賞一下你的“光芒”。

戀戀：這個(gè)問題按照你的思路，我可以先從我公司門口的食堂說起，一般食堂都有固定的菜色，因?yàn)闊瑯拥臇|西處理能力強(qiáng)、成本低，而如果為每一個(gè)顧客單獨(dú)炒菜，那么成本就會(huì)高很多。

云云：你這個(gè)跑題有點(diǎn)遠(yuǎn)啊！

戀戀：所以作為顧客，我們一般幾個(gè)人都點(diǎn)相同的菜，這樣廚子燒的快，無論從配菜，到燒菜都會(huì)并行處理。總的來說就是，如果每個(gè)人都要不同的東西，會(huì)讓一個(gè)飯店很忙，處理能力降低，而如果要的東西類似，那么就會(huì)極大地提高處理效率，從而增加營業(yè)額。

云云：哎喲，貌似靠譜了。

戀戀：作為軟件系統(tǒng)來說也是這樣，如果每次對服務(wù)器發(fā)出的請求不同，那么服務(wù)器也會(huì)為每一個(gè)請求單獨(dú)計(jì)算，從而會(huì)讓服務(wù)器很忙，提高效率就是要讓客戶做的事情盡量相同，然后服務(wù)器就可以并行處理了。

云云：嗯，不錯(cuò)，不過有些不太專業(yè)。

戀戀：比如A和B做相同的請求，那么對于數(shù)據(jù)庫來說查詢的內(nèi)容都相同，那么就可以只計(jì)算一次，然后內(nèi)容就可以一次發(fā)給客戶啦，就好像兩個(gè)人都點(diǎn)宮保雞丁炒飯一樣，一次炒制，兩盤出鍋。

云云：雖然請求相同，但是可能因?yàn)闃I(yè)務(wù)不同而導(dǎo)致結(jié)果不同啊，比如A是管理員能看所有的記錄，而B是普通用戶只能看自己的記錄！

戀戀：這個(gè)……

云云：那你覺得請求應(yīng)該相同還是不相同呢？

戀戀：我覺得請求應(yīng)該不同，因?yàn)槟慵热蛔屛野涯_本動(dòng)起來，還給我說怎么做參數(shù)變量、處理業(yè)務(wù)，本質(zhì)上就是要讓每次輸入的東西都不一樣。

云云：沒錯(cuò)，如果每次請求都一樣，那么服務(wù)器會(huì)自動(dòng)使用Cache機(jī)制，這也是一個(gè)使服務(wù)器提高處理能力的策略，當(dāng)發(fā)現(xiàn)請求或者查詢內(nèi)容相同，系統(tǒng)會(huì)先從緩存（內(nèi)存）中查找是否存在匹配的記錄，如果有就返回，否則就執(zhí)行一次，將結(jié)果存放入緩存，唯一特例就是所謂的要做及時(shí)查詢，就是鎖概念。

戀戀：嗯，我也聽說過什么MemCache、PGA&SGA還有啥JVM內(nèi)存管理，都是和緩存有關(guān)系，鎖這個(gè)概念我就不太懂了。

云云：鎖這個(gè)概念怎么說呢，這樣吧，你知道12306買火車票難吧。

戀戀：知道啊，不知道誰做那么差個(gè)系統(tǒng)，查個(gè)火車票都經(jīng)常刷不出來。

云云：這就叫做外行看熱鬧，內(nèi)行看門道。其實(shí)做火車訂票系統(tǒng)是很難的，因?yàn)椴槠笔羌皶r(shí)的，要鎖定票。

戀戀：Go on！

云云：每當(dāng)一張票被訂的時(shí)候，所有的查詢都要得到全新的少了一張票的情況，所有的訂票都要告訴別人這個(gè)位置的這個(gè)票已經(jīng)被訂了。所以當(dāng)成千上萬的人去買票的時(shí)候，一張票被鎖定會(huì)影響幾萬個(gè)查詢，每次查詢都不能用Cache，否則會(huì)得到錯(cuò)誤的信息，你明明看到這個(gè)票有，但是訂的時(shí)候卻失敗。

戀戀：Go on！

云云：這里面還有更復(fù)雜的業(yè)務(wù)，比如從上海到北京的高鐵，如果我訂了一張從南京到天津的票，就意味著會(huì)多一張上海到南京的票，還有一張從天津到北京的票！

戀戀：那么怎么優(yōu)化呢？

云云：很簡單，首先不要做及時(shí)查詢，例如不要直接給每個(gè)客戶看有多少張剩票，其次當(dāng)一張票訂了后，不要立即計(jì)算出可能導(dǎo)致生成的部分路程的票，最后將坐全程的票和坐半程的票位置分開做表分離，這樣就算買了半程票影響的記錄會(huì)比較少，處理起來相對簡單，讓專門的服務(wù)器去處理多程票！

戀戀：來吃個(gè)梨，你看又進(jìn)入狀態(tài)了吧，后面一個(gè)人就亢奮的說啊說啊，完全不管別人懂不懂。

云云：真是好心沒有好報(bào)，看在你給我削梨的舉動(dòng)上就原諒你了。睡覺前是不是可以做第二個(gè)性能測試案例了啊。

戀戀：今天晚上要做啥啊？

云云：做一個(gè)腳本比較一下點(diǎn)擊相同的帖子和點(diǎn)擊不同的帖子的性能有何區(qū)別！

戀戀：好，開工。

**小結(jié)
理解動(dòng)態(tài)訪問會(huì)帶來的負(fù)載點(diǎn)及系統(tǒng)處理業(yè)務(wù)的邏輯概念。
錄制腳本運(yùn)行
**
戀戀：打開LR啟動(dòng)VuGen錄制一個(gè)腳本。

云云：別忘了你首先要有那么多帖子，否則你查詢不到。

戀戀：對，那么先錄一個(gè)生成帖子的腳本吧。

（幾分鐘過去后）

戀戀：腳本生成。

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戀戀：這里我用了一個(gè)循環(huán)，做了1000次。

云云：那么你發(fā)帖的那個(gè)參數(shù)是？

戀戀：{topic}啊，這是我定義的一個(gè)時(shí)間參數(shù)，這樣每次帖子都不一樣，如圖2-23所示。

云云：哎喲，不錯(cuò)哦。

戀戀：好了，單擊運(yùn)行，我去給你削個(gè)梨。

云云：好！不過，如果你用場景，運(yùn)行會(huì)快一些。

戀戀：好啊，你自己削梨去，EQ真低。

云云：我錯(cuò)了，還是你幫我削吧。

（幾分鐘后，帖子生成）如圖2-24所示。

戀戀：接著我要錄制一個(gè)用戶隨機(jī)訪問帖子的腳本和一個(gè)用戶訪問一個(gè)固定帖子的腳本。Action() {web_url("discuz", "URL=http://127.0.0.1/discuz/", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=", "Snapshot=t1.inf", "Mode=HTML", EXTRARES, "Url=static/image/common/background.png", "Referer=http://127.0.0.1/discuz/forum.　 php", ENDITEM, "Url=static/image/common/search.gif", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/nv.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/px.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/titlebg.png", "Referer=http://127.0.0.1/discuz/forum.　 php", ENDITEM, "Url=static/image/common/nv_a.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/qmenu.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/chart.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, LAST);lr_think_time(5);web_url("默認(rèn)版塊", "URL=http://127.0.0.1/discuz/forum.php?mod=forumdisplay&fid=2", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=http://127.0.0.1/discuz/forum.php", "Snapshot=t2.inf", "Mode=HTML", EXTRARES, "Url=static/image/common/pt_icn.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/pt_item.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arrwd.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/fav.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/feed.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arw_l.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arw_r.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/atarget.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/editor/editor.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, LAST);lr_think_time(4);web_url("第二天測試專用2016-05-03 00:09:10.850", "URL=http://127.0.0.1/discuz/forum.php?mod=viewthread&tid=1867&extra=page%3D1", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=http://127.0.0.1/discuz/forum.php?mod=forumdisplay&fid=2", "Snapshot=t3.inf", "Mode=HTML", EXTRARES, "Url=uc_server/images/noavatar_middle.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/oshr.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/rec_add.gif", "Referer=http://127.0.0.1/discuz/forum. php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/midavt_shadow.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/fastreply.gif", "Referer=http://127.0.0.1/discuz/forum. php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/rec_subtract.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/flbg.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/repquote.gif", "Referer=http://127.0.0.1/discuz/forum. php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, LAST);return 0; }

戀戀：找到看帖請求的那個(gè)函數(shù)，然后將這個(gè)請求內(nèi)容做一個(gè)參數(shù)化，參數(shù)名稱叫作tid，并且設(shè)置從1～1000的隨機(jī)數(shù)，如圖2-25所示。

Action() {web_url("discuz", "URL=http://127.0.0.1/discuz/", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=", "Snapshot=t1.inf", "Mode=HTML", EXTRARES, "Url=static/image/common/background.png", "Referer=http://127.0.0.1/discuz/forum. php", ENDITEM, "Url=static/image/common/search.gif", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/nv.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/px.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/titlebg.png", "Referer=http://127.0.0.1/discuz/forum. php", ENDITEM, "Url=static/image/common/nv_a.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/qmenu.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/chart.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, LAST);lr_think_time(5);web_url("默認(rèn)版塊", "URL=http://127.0.0.1/discuz/forum.php?mod=forumdisplay&fid=2", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=http://127.0.0.1/discuz/forum.php", "Snapshot=t2.inf", "Mode=HTML", EXTRARES, "Url=static/image/common/pt_icn.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/pt_item.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arrwd.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/fav.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/feed.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arw_l.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arw_r.gif", "Referer=http://127.0.0.1/discuz/ forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/atarget.png", "Referer=http://127.0.0.1/discuz/forum. php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/editor/editor.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, LAST);lr_think_time(4);web_url("第二天測試專用2016-05-03 00:09:10.850", "URL=http://127.0.0.1/discuz/forum.php?mod=viewthread&tid={tid}&extra=page%3D1", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=http://127.0.0.1/discuz/forum.php?mod=forumdisplay&fid=2", "Snapshot=t3.inf", "Mode=HTML", EXTRARES, "Url=uc_server/images/noavatar_middle.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/oshr.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/rec_add.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/midavt_shadow.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/fastreply.gif", "Referer=http://127.0.0.1/discuz/forum. php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/rec_subtract.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/flbg.gif", "Referer=http://127.0.0.1/discuz/forum. php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/repquote.gif", "Referer=http://127.0.0.1/discuz/forum. php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, LAST);return 0; }

戀戀：最后還要在查詢前后加個(gè)事務(wù)，讓腳本運(yùn)行的時(shí)候能夠統(tǒng)計(jì)響應(yīng)時(shí)間，先來試著運(yùn)行一下。

Action() {web_url("discuz", "URL=http://127.0.0.1/discuz/", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=", "Snapshot=t1.inf", "Mode=HTML", EXTRARES, "Url=static/image/common/background.png", "Referer=http://127.0.0.1/discuz/forum. php", ENDITEM, "Url=static/image/common/search.gif", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/nv.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/px.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/titlebg.png", "Referer=http://127.0.0.1/discuz/forum. php", ENDITEM, "Url=static/image/common/nv_a.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/qmenu.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, "Url=static/image/common/chart.png", "Referer=http://127.0.0.1/discuz/forum.php", ENDITEM, LAST);lr_think_time(5);web_url("默認(rèn)版塊", "URL=http://127.0.0.1/discuz/forum.php?mod=forumdisplay&fid=2", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=http://127.0.0.1/discuz/forum.php", "Snapshot=t2.inf", "Mode=HTML", EXTRARES, "Url=static/image/common/pt_icn.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/pt_item.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arrwd.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/fav.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/feed.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arw_l.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/arw_r.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/common/atarget.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, "Url=static/image/editor/editor.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=forumdisplay&fid=2", ENDITEM, LAST);lr_think_time(4);lr_start_transaction("viewtopic");web_url("第二天測試專用2016-05-03 00:09:10.850", "URL=http://127.0.0.1/discuz/forum.php?mod=viewthread&tid={tid}&extra=page%3D1", "TargetFrame=", "Resource=0", "RecContentType=text/html", "Referer=http://127.0.0.1/discuz/forum.php?mod=forumdisplay&fid=2", "Snapshot=t3.inf", "Mode=HTML", EXTRARES, "Url=uc_server/images/noavatar_middle.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/oshr.png", "Referer=http://127.0.0.1/discuz/forum.php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/rec_add.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/midavt_shadow.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/fastreply.gif", "Referer=http://127.0.0.1/discuz/ forum. php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/rec_subtract.gif", "Referer=http://127.0.0.1/discuz/ forum.php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/flbg.gif", "Referer=http://127.0.0.1/discuz/forum.php? mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, "Url=static/image/common/repquote.gif", "Referer=http://127.0.0.1/discuz/forum. php?mod=viewthread&tid=1867&extra=page%3D1", ENDITEM, LAST); lr_end_transaction("viewtopic", LR_AUTO);return 0; }

戀戀：代碼運(yùn)行大功告成！

云云：值得表揚(yáng)！

（分別運(yùn)行未參數(shù)化和參數(shù)化過的腳本）。

戀戀：好像查詢條件是隨機(jī)的會(huì)慢一點(diǎn)。

云云：Go On。

戀戀：OK，搞定兩個(gè)腳本，一個(gè)是原腳本，查詢條件不變的；還有一個(gè)是查詢條件是隨機(jī)的內(nèi)容，接著分別到場景里面去運(yùn)行一下。

戀戀：場景里面要添加監(jiān)控內(nèi)容（Windows資源），單擊開始運(yùn)行。

創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

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